URI (Knopflerfish OSGi 6.1.1 javadoc)

java.lang.Object
- org.apache.commons.httpclient.URI

All Implemented Interfaces:: java.io.Serializable, java.lang.Cloneable, java.lang.Comparable

Direct Known Subclasses:: HttpURL, URIUtil.Coder

public class URI
extends java.lang.Object
implements java.lang.Cloneable, java.lang.Comparable, java.io.Serializable

The interface for the URI(Uniform Resource Identifiers) version of RFC 2396. This class has the purpose of supportting of parsing a URI reference to extend any specific protocols, the character encoding of the protocol to be transported and the charset of the document.

A URI is always in an "escaped" form, since escaping or unescaping a completed URI might change its semantics.

Implementers should be careful not to escape or unescape the same string more than once, since unescaping an already unescaped string might lead to misinterpreting a percent data character as another escaped character, or vice versa in the case of escaping an already escaped string.

In order to avoid these problems, data types used as follows:

   URI character sequence: char
   octet sequence: byte
   original character sequence: String

So, a URI is a sequence of characters as an array of a char type, which is not always represented as a sequence of octets as an array of byte.

URI Syntactic Components

 - In general, written as follows:
   Absolute URI = <scheme>:<scheme-specific-part>
   Generic URI = <scheme>://<authority><path>?<query>

 - Syntax
   absoluteURI   = scheme ":" ( hier_part | opaque_part )
   hier_part     = ( net_path | abs_path ) [ "?" query ]
   net_path      = "//" authority [ abs_path ]
   abs_path      = "/"  path_segments

The following examples illustrate URI that are in common use.

 ftp://ftp.is.co.za/rfc/rfc1808.txt
    -- ftp scheme for File Transfer Protocol services
 gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles
    -- gopher scheme for Gopher and Gopher+ Protocol services
 http://www.math.uio.no/faq/compression-faq/part1.html
    -- http scheme for Hypertext Transfer Protocol services
 mailto:mduerst@ifi.unizh.ch
    -- mailto scheme for electronic mail addresses
 news:comp.infosystems.www.servers.unix
    -- news scheme for USENET news groups and articles
 telnet://melvyl.ucop.edu/
    -- telnet scheme for interactive services via the TELNET Protocol

Please, notice that there are many modifications from URL(RFC 1738) and relative URL(RFC 1808).

The expressions for a URI

 For escaped URI forms
  - URI(char[]) // constructor
  - char[] getRawXxx() // method
  - String getEscapedXxx() // method
  - String toString() // method
 
 For unescaped URI forms
  - URI(String) // constructor
  - String getXXX() // method

Version:: $Revision: 564973 $ $Date: 2002/03/14 15:14:01
Author:: Sung-Gu, Mike Bowler
See Also:: Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`URI.DefaultCharsetChanged` The charset-changed normal operation to represent to be required to alert to user the fact the default charset is changed.
`static class`	`URI.LocaleToCharsetMap` A mapping to determine the (somewhat arbitrarily) preferred charset for a given locale.

Field Summary

Fields
Modifier and Type	Field and Description
`protected char[]`	`_authority` The authority.
`protected char[]`	`_fragment` The fragment.
`protected char[]`	`_host` The host.
`protected boolean`	`_is_abs_path`
`protected boolean`	`_is_hier_part`
`protected boolean`	`_is_hostname`
`protected boolean`	`_is_IPv4address`
`protected boolean`	`_is_IPv6reference`
`protected boolean`	`_is_net_path`
`protected boolean`	`_is_opaque_part`
`protected boolean`	`_is_reg_name`
`protected boolean`	`_is_rel_path`
`protected boolean`	`_is_server`
`protected char[]`	`_opaque` The opaque.
`protected char[]`	`_path` The path.
`protected int`	`_port` The port.
`protected char[]`	`_query` The query.
`protected char[]`	`_scheme` The scheme.
`protected char[]`	`_uri` This Uniform Resource Identifier (URI).
`protected char[]`	`_userinfo` The userinfo.
`protected static java.util.BitSet`	`abs_path` URI absolute path.
`protected static java.util.BitSet`	`absoluteURI` BitSet for absoluteURI.
`static java.util.BitSet`	`allowed_abs_path` Those characters that are allowed for the abs_path.
`static java.util.BitSet`	`allowed_authority` Those characters that are allowed for the authority component.
`static java.util.BitSet`	`allowed_fragment` Those characters that are allowed for the fragment component.
`static java.util.BitSet`	`allowed_host` Those characters that are allowed for the host component.
`static java.util.BitSet`	`allowed_IPv6reference` Those characters that are allowed for the IPv6reference component.
`static java.util.BitSet`	`allowed_opaque_part` Those characters that are allowed for the opaque_part.
`static java.util.BitSet`	`allowed_query` Those characters that are allowed for the query component.
`static java.util.BitSet`	`allowed_reg_name` Those characters that are allowed for the reg_name.
`static java.util.BitSet`	`allowed_rel_path` Those characters that are allowed for the rel_path.
`static java.util.BitSet`	`allowed_userinfo` Those characters that are allowed for the userinfo component.
`static java.util.BitSet`	`allowed_within_authority` Those characters that are allowed for the authority component.
`static java.util.BitSet`	`allowed_within_path` Those characters that are allowed within the path.
`static java.util.BitSet`	`allowed_within_query` Those characters that are allowed within the query component.
`static java.util.BitSet`	`allowed_within_userinfo` Those characters that are allowed for within the userinfo component.
`protected static java.util.BitSet`	`alpha` BitSet for alpha.
`protected static java.util.BitSet`	`alphanum` BitSet for alphanum (join of alpha & digit).
`protected static java.util.BitSet`	`authority` BitSet for authority.
`static java.util.BitSet`	`control` BitSet for control.
`protected static java.lang.String`	`defaultDocumentCharset` The default charset of the document.
`protected static java.lang.String`	`defaultDocumentCharsetByLocale`
`protected static java.lang.String`	`defaultDocumentCharsetByPlatform`
`protected static java.lang.String`	`defaultProtocolCharset` The default charset of the protocol.
`static java.util.BitSet`	`delims` BitSet for delims.
`protected static java.util.BitSet`	`digit` BitSet for digit.
`static java.util.BitSet`	`disallowed_opaque_part` Disallowed opaque_part before escaping.
`static java.util.BitSet`	`disallowed_rel_path` Disallowed rel_path before escaping.
`protected static java.util.BitSet`	`domainlabel` BitSet for domainlabel.
`protected static java.util.BitSet`	`escaped` BitSet for escaped.
`protected static java.util.BitSet`	`fragment` BitSet for fragment (alias for uric).
`protected int`	`hash` Cache the hash code for this URI.
`protected static java.util.BitSet`	`hex` BitSet for hex.
`protected static java.util.BitSet`	`hier_part` BitSet for hier_part.
`protected static java.util.BitSet`	`host` BitSet for host.
`protected static java.util.BitSet`	`hostname` BitSet for hostname.
`protected static java.util.BitSet`	`hostport` BitSet for hostport.
`protected static java.util.BitSet`	`IPv4address` Bitset that combines digit and dot fo IPv$address.
`protected static java.util.BitSet`	`IPv6address` RFC 2373.
`protected static java.util.BitSet`	`IPv6reference` RFC 2732, 2373.
`protected static java.util.BitSet`	`mark` BitSet for mark.
`protected static java.util.BitSet`	`net_path` BitSet for net_path.
`protected static java.util.BitSet`	`opaque_part` URI bitset that combines uric_no_slash and uric.
`protected static java.util.BitSet`	`param` BitSet for param (alias for pchar).
`protected static java.util.BitSet`	`path` URI bitset that combines absolute path and opaque part.
`protected static java.util.BitSet`	`path_segments` BitSet for path segments.
`protected static java.util.BitSet`	`pchar` BitSet for pchar.
`protected static java.util.BitSet`	`percent` The percent "%" character always has the reserved purpose of being the escape indicator, it must be escaped as "%25" in order to be used as data within a URI.
`protected static java.util.BitSet`	`port` Port, a logical alias for digit.
`protected java.lang.String`	`protocolCharset` The charset of the protocol used by this URI instance.
`protected static java.util.BitSet`	`query` BitSet for query (alias for uric).
`protected static java.util.BitSet`	`reg_name` BitSet for reg_name.
`protected static java.util.BitSet`	`rel_path` BitSet for rel_path.
`protected static java.util.BitSet`	`rel_segment` BitSet for rel_segment.
`protected static java.util.BitSet`	`relativeURI` BitSet for relativeURI.
`protected static java.util.BitSet`	`reserved` BitSet for reserved.
`protected static char[]`	`rootPath` The root path.
`protected static java.util.BitSet`	`scheme` BitSet for scheme.
`protected static java.util.BitSet`	`segment` BitSet for segment.
`protected static java.util.BitSet`	`server` Bitset for server.
`static java.util.BitSet`	`space` BitSet for space.
`protected static java.util.BitSet`	`toplabel` BitSet for toplabel.
`protected static java.util.BitSet`	`unreserved` Data characters that are allowed in a URI but do not have a reserved purpose are called unreserved.
`static java.util.BitSet`	`unwise` BitSet for unwise.
`protected static java.util.BitSet`	`URI_reference` BitSet for URI-reference.
`protected static java.util.BitSet`	`uric` BitSet for uric.
`protected static java.util.BitSet`	`uric_no_slash` URI bitset for encoding typical non-slash characters.
`protected static java.util.BitSet`	`userinfo` Bitset for userinfo.
`static java.util.BitSet`	`within_userinfo` BitSet for within the userinfo component like user and password.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`URI()` Create an instance as an internal use
	`URI(char[] escaped)` Deprecated. Use #URI(String, boolean)
	`URI(char[] escaped, java.lang.String charset)` Deprecated. Use #URI(String, boolean, String)
	`URI(java.lang.String original)` Deprecated. Use #URI(String, boolean)
	`URI(java.lang.String s, boolean escaped)` Construct a URI from a string with the given charset.
	`URI(java.lang.String s, boolean escaped, java.lang.String charset)` Construct a URI from a string with the given charset.
	`URI(java.lang.String original, java.lang.String charset)` Deprecated. Use #URI(String, boolean, String)
	`URI(java.lang.String scheme, java.lang.String schemeSpecificPart, java.lang.String fragment)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String userinfo, java.lang.String host, int port)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String userinfo, java.lang.String host, int port, java.lang.String path)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String userinfo, java.lang.String host, int port, java.lang.String path, java.lang.String query)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String userinfo, java.lang.String host, int port, java.lang.String path, java.lang.String query, java.lang.String fragment)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String host, java.lang.String path, java.lang.String fragment)` Construct a general URI from the given components.
	`URI(java.lang.String scheme, java.lang.String authority, java.lang.String path, java.lang.String query, java.lang.String fragment)` Construct a general URI from the given components.
	`URI(URI base, java.lang.String relative)` Deprecated. Use #URI(URI, String, boolean)
	`URI(URI base, java.lang.String relative, boolean escaped)` Construct a general URI with the given relative URI string.
	`URI(URI base, URI relative)` Construct a general URI with the given relative URI.

Method Summary

Methods
Modifier and Type	Method and Description
`java.lang.Object`	`clone()` Create and return a copy of this object, the URI-reference containing the userinfo component.
`int`	`compareTo(java.lang.Object obj)` Compare this URI to another object.
`protected static java.lang.String`	`decode(char[] component, java.lang.String charset)` Decodes URI encoded string.
`protected static java.lang.String`	`decode(java.lang.String component, java.lang.String charset)` Decodes URI encoded string.
`protected static char[]`	`encode(java.lang.String original, java.util.BitSet allowed, java.lang.String charset)` Encodes URI string.
`protected boolean`	`equals(char[] first, char[] second)` Test if the first array is equal to the second array.
`boolean`	`equals(java.lang.Object obj)` Test an object if this URI is equal to another.
`java.lang.String`	`getAboveHierPath()` Get the level above the this hierarchy level.
`java.lang.String`	`getAuthority()` Get the authority.
`java.lang.String`	`getCurrentHierPath()` Get the current hierarchy level.
`static java.lang.String`	`getDefaultDocumentCharset()` Get the recommended default charset of the document.
`static java.lang.String`	`getDefaultDocumentCharsetByLocale()` Get the default charset of the document by locale.
`static java.lang.String`	`getDefaultDocumentCharsetByPlatform()` Get the default charset of the document by platform.
`static java.lang.String`	`getDefaultProtocolCharset()` Get the default charset of the protocol.
`java.lang.String`	`getEscapedAboveHierPath()` Get the level above the this hierarchy level.
`java.lang.String`	`getEscapedAuthority()` Get the escaped authority.
`java.lang.String`	`getEscapedCurrentHierPath()` Get the escaped current hierarchy level.
`java.lang.String`	`getEscapedFragment()` Get the escaped fragment.
`java.lang.String`	`getEscapedName()` Get the escaped basename of the path.
`java.lang.String`	`getEscapedPath()` Get the escaped path.
`java.lang.String`	`getEscapedPathQuery()` Get the escaped query.
`java.lang.String`	`getEscapedQuery()` Get the escaped query.
`java.lang.String`	`getEscapedURI()` It can be gotten the URI character sequence.
`java.lang.String`	`getEscapedURIReference()` Get the escaped URI reference string.
`java.lang.String`	`getEscapedUserinfo()` Get the escaped userinfo.
`java.lang.String`	`getFragment()` Get the fragment.
`java.lang.String`	`getHost()` Get the host.
`java.lang.String`	`getName()` Get the basename of the path.
`java.lang.String`	`getPath()` Get the path.
`java.lang.String`	`getPathQuery()` Get the path and query.
`int`	`getPort()` Get the port.
`java.lang.String`	`getProtocolCharset()` Get the protocol charset used by this current URI instance.
`java.lang.String`	`getQuery()` Get the query.
`char[]`	`getRawAboveHierPath()` Get the level above the this hierarchy level.
`char[]`	`getRawAuthority()` Get the raw-escaped authority.
`char[]`	`getRawCurrentHierPath()` Get the raw-escaped current hierarchy level.
`protected char[]`	`getRawCurrentHierPath(char[] path)` Get the raw-escaped current hierarchy level in the given path.
`char[]`	`getRawFragment()` Get the raw-escaped fragment.
`char[]`	`getRawHost()` Get the host.
`char[]`	`getRawName()` Get the raw-escaped basename of the path.
`char[]`	`getRawPath()` Get the raw-escaped path.
`char[]`	`getRawPathQuery()` Get the raw-escaped path and query.
`char[]`	`getRawQuery()` Get the raw-escaped query.
`char[]`	`getRawScheme()` Get the scheme.
`char[]`	`getRawURI()` It can be gotten the URI character sequence.
`char[]`	`getRawURIReference()` Get the URI reference character sequence.
`char[]`	`getRawUserinfo()` Get the raw-escaped userinfo.
`java.lang.String`	`getScheme()` Get the scheme.
`java.lang.String`	`getURI()` It can be gotten the URI character sequence.
`java.lang.String`	`getURIReference()` Get the original URI reference string.
`java.lang.String`	`getUserinfo()` Get the userinfo.
`boolean`	`hasAuthority()` Tell whether or not this URI has authority.
`boolean`	`hasFragment()` Tell whether or not this URI has fragment.
`int`	`hashCode()` Return a hash code for this URI.
`boolean`	`hasQuery()` Tell whether or not this URI has query.
`boolean`	`hasUserinfo()` Tell whether or not this URI has userinfo.
`protected int`	`indexFirstOf(char[] s, char delim)` Get the earlier index that to be searched for the first occurrance in one of any of the given array.
`protected int`	`indexFirstOf(char[] s, char delim, int offset)` Get the earlier index that to be searched for the first occurrance in one of any of the given array.
`protected int`	`indexFirstOf(java.lang.String s, java.lang.String delims)` Get the earlier index that to be searched for the first occurrance in one of any of the given string.
`protected int`	`indexFirstOf(java.lang.String s, java.lang.String delims, int offset)` Get the earlier index that to be searched for the first occurrance in one of any of the given string.
`boolean`	`isAbsoluteURI()` Tell whether or not this URI is absolute.
`boolean`	`isAbsPath()` Tell whether or not the relativeURI or hier_part of this URI is abs_path.
`boolean`	`isHierPart()` Tell whether or not the absoluteURI of this URI is hier_part.
`boolean`	`isHostname()` Tell whether or not the host part of this URI is hostname.
`boolean`	`isIPv4address()` Tell whether or not the host part of this URI is IPv4address.
`boolean`	`isIPv6reference()` Tell whether or not the host part of this URI is IPv6reference.
`boolean`	`isNetPath()` Tell whether or not the relativeURI or heir_part of this URI is net_path.
`boolean`	`isOpaquePart()` Tell whether or not the absoluteURI of this URI is opaque_part.
`boolean`	`isRegName()` Tell whether or not the authority component of this URI is reg_name.
`boolean`	`isRelativeURI()` Tell whether or not this URI is relative.
`boolean`	`isRelPath()` Tell whether or not the relativeURI of this URI is rel_path.
`boolean`	`isServer()` Tell whether or not the authority component of this URI is server.
`void`	`normalize()` Normalizes the path part of this URI.
`protected char[]`	`normalize(char[] path)` Normalize the given hier path part.
`protected void`	`parseAuthority(java.lang.String original, boolean escaped)` Parse the authority component.
`protected void`	`parseUriReference(java.lang.String original, boolean escaped)` In order to avoid any possilbity of conflict with non-ASCII characters, Parse a URI reference as a `String` with the character encoding of the local system or the document.
`protected boolean`	`prevalidate(java.lang.String component, java.util.BitSet disallowed)` Pre-validate the unescaped URI string within a specific component.
`protected char[]`	`removeFragmentIdentifier(char[] component)` Remove the fragment identifier of the given component.
`protected char[]`	`resolvePath(char[] basePath, char[] relPath)` Resolve the base and relative path.
`static void`	`setDefaultDocumentCharset(java.lang.String charset)` Set the default charset of the document.
`static void`	`setDefaultProtocolCharset(java.lang.String charset)` Set the default charset of the protocol.
`void`	`setEscapedAuthority(java.lang.String escapedAuthority)` Set the authority.
`void`	`setEscapedFragment(java.lang.String escapedFragment)` Set the escaped fragment string.
`void`	`setEscapedPath(java.lang.String escapedPath)` Set the escaped path.
`void`	`setEscapedQuery(java.lang.String escapedQuery)` Set the escaped query string.
`void`	`setFragment(java.lang.String fragment)` Set the fragment.
`void`	`setPath(java.lang.String path)` Set the path.
`void`	`setQuery(java.lang.String query)` Set the query.
`void`	`setRawAuthority(char[] escapedAuthority)` Set the authority.
`void`	`setRawFragment(char[] escapedFragment)` Set the raw-escaped fragment.
`void`	`setRawPath(char[] escapedPath)` Set the raw-escaped path.
`void`	`setRawQuery(char[] escapedQuery)` Set the raw-escaped query.
`protected void`	`setURI()` Once it's parsed successfully, set this URI.
`java.lang.String`	`toString()` Get the escaped URI string.
`protected boolean`	`validate(char[] component, java.util.BitSet generous)` Validate the URI characters within a specific component.
`protected boolean`	`validate(char[] component, int soffset, int eoffset, java.util.BitSet generous)` Validate the URI characters within a specific component.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - hash
```
protected int hash
```
    Cache the hash code for this URI.
  - _uri
```
protected char[] _uri
```
    This Uniform Resource Identifier (URI). The URI is always in an "escaped" form, since escaping or unescaping a completed URI might change its semantics.
  - protocolCharset
```
protected java.lang.String protocolCharset
```
    The charset of the protocol used by this URI instance.
  - defaultProtocolCharset
```
protected static java.lang.String defaultProtocolCharset
```
    The default charset of the protocol. RFC 2277, 2396
  - defaultDocumentCharset
```
protected static java.lang.String defaultDocumentCharset
```
    The default charset of the document. RFC 2277, 2396 The platform's charset is used for the document by default.
  - defaultDocumentCharsetByLocale
```
protected static java.lang.String defaultDocumentCharsetByLocale
```
  - defaultDocumentCharsetByPlatform
```
protected static java.lang.String defaultDocumentCharsetByPlatform
```
  - _scheme
```
protected char[] _scheme
```
    The scheme.
  - _opaque
```
protected char[] _opaque
```
    The opaque.
  - _authority
```
protected char[] _authority
```
    The authority.
  - _userinfo
```
protected char[] _userinfo
```
    The userinfo.
  - _host
```
protected char[] _host
```
    The host.
  - _port
```
protected int _port
```
    The port.
  - _path
```
protected char[] _path
```
    The path.
  - _query
```
protected char[] _query
```
    The query.
  - _fragment
```
protected char[] _fragment
```
    The fragment.
  - rootPath
```
protected static final char[] rootPath
```
    The root path.
  - percent
```
protected static final java.util.BitSet percent
```
    The percent "%" character always has the reserved purpose of being the escape indicator, it must be escaped as "%25" in order to be used as data within a URI.
  - digit
```
protected static final java.util.BitSet digit
```
    BitSet for digit.
    digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
  - alpha
```
protected static final java.util.BitSet alpha
```
    BitSet for alpha.
    alpha = lowalpha | upalpha
  - alphanum
```
protected static final java.util.BitSet alphanum
```
    BitSet for alphanum (join of alpha & digit).
    alphanum = alpha | digit
  - hex
```
protected static final java.util.BitSet hex
```
    BitSet for hex.
    hex = digit | "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b" | "c" | "d" | "e" | "f"
  - escaped
```
protected static final java.util.BitSet escaped
```
    BitSet for escaped.
    escaped = "%" hex hex
  - mark
```
protected static final java.util.BitSet mark
```
    BitSet for mark.
    mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
  - unreserved
```
protected static final java.util.BitSet unreserved
```
    Data characters that are allowed in a URI but do not have a reserved purpose are called unreserved.
    unreserved = alphanum | mark
  - reserved
```
protected static final java.util.BitSet reserved
```
    BitSet for reserved.
    reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ","
  - uric
```
protected static final java.util.BitSet uric
```
    BitSet for uric.
    uric = reserved | unreserved | escaped
  - fragment
```
protected static final java.util.BitSet fragment
```
    BitSet for fragment (alias for uric).
    fragment = *uric
  - query
```
protected static final java.util.BitSet query
```
    BitSet for query (alias for uric).
    query = *uric
  - pchar
```
protected static final java.util.BitSet pchar
```
    BitSet for pchar.
    pchar = unreserved | escaped | ":" | "@" | "&" | "=" | "+" | "$" | ","
  - param
```
protected static final java.util.BitSet param
```
    BitSet for param (alias for pchar).
    param = *pchar
  - segment
```
protected static final java.util.BitSet segment
```
    BitSet for segment.
    segment = *pchar *( ";" param )
  - path_segments
```
protected static final java.util.BitSet path_segments
```
    BitSet for path segments.
    path_segments = segment *( "/" segment )
  - abs_path
```
protected static final java.util.BitSet abs_path
```
    URI absolute path.
    abs_path = "/" path_segments
  - uric_no_slash
```
protected static final java.util.BitSet uric_no_slash
```
    URI bitset for encoding typical non-slash characters.
    uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ","
  - opaque_part
```
protected static final java.util.BitSet opaque_part
```
    URI bitset that combines uric_no_slash and uric.
    opaque_part = uric_no_slash *uric
  - path
```
protected static final java.util.BitSet path
```
    URI bitset that combines absolute path and opaque part.
    path = [ abs_path | opaque_part ]
  - port
```
protected static final java.util.BitSet port
```
    Port, a logical alias for digit.
  - IPv4address
```
protected static final java.util.BitSet IPv4address
```
    Bitset that combines digit and dot fo IPv$address.
    IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
  - IPv6address
```
protected static final java.util.BitSet IPv6address
```
    RFC 2373.
    IPv6address = hexpart [ ":" IPv4address ]
  - IPv6reference
```
protected static final java.util.BitSet IPv6reference
```
    RFC 2732, 2373.
    IPv6reference = "[" IPv6address "]"
  - toplabel
```
protected static final java.util.BitSet toplabel
```
    BitSet for toplabel.
    toplabel = alpha | alpha *( alphanum | "-" ) alphanum
  - domainlabel
```
protected static final java.util.BitSet domainlabel
```
    BitSet for domainlabel.
    domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
  - hostname
```
protected static final java.util.BitSet hostname
```
    BitSet for hostname.
    hostname = *( domainlabel "." ) toplabel [ "." ]
  - host
```
protected static final java.util.BitSet host
```
    BitSet for host.
    host = hostname | IPv4address | IPv6reference
  - hostport
```
protected static final java.util.BitSet hostport
```
    BitSet for hostport.
    hostport = host [ ":" port ]
  - userinfo
```
protected static final java.util.BitSet userinfo
```
    Bitset for userinfo.
    userinfo = *( unreserved | escaped | ";" | ":" | "&" | "=" | "+" | "$" | "," )
  - within_userinfo
```
public static final java.util.BitSet within_userinfo
```
    BitSet for within the userinfo component like user and password.
  - server
```
protected static final java.util.BitSet server
```
    Bitset for server.
    server = [ [ userinfo "@" ] hostport ]
  - reg_name
```
protected static final java.util.BitSet reg_name
```
    BitSet for reg_name.
    reg_name = 1*( unreserved | escaped | "$" | "," | ";" | ":" | "@" | "&" | "=" | "+" )
  - authority
```
protected static final java.util.BitSet authority
```
    BitSet for authority.
    authority = server | reg_name
  - scheme
```
protected static final java.util.BitSet scheme
```
    BitSet for scheme.
    scheme = alpha *( alpha | digit | "+" | "-" | "." )
  - rel_segment
```
protected static final java.util.BitSet rel_segment
```
    BitSet for rel_segment.
    rel_segment = 1*( unreserved | escaped | ";" | "@" | "&" | "=" | "+" | "$" | "," )
  - rel_path
```
protected static final java.util.BitSet rel_path
```
    BitSet for rel_path.
    rel_path = rel_segment [ abs_path ]
  - net_path
```
protected static final java.util.BitSet net_path
```
    BitSet for net_path.
    net_path = "//" authority [ abs_path ]
  - hier_part
```
protected static final java.util.BitSet hier_part
```
    BitSet for hier_part.
    hier_part = ( net_path | abs_path ) [ "?" query ]
  - relativeURI
```
protected static final java.util.BitSet relativeURI
```
    BitSet for relativeURI.
    relativeURI = ( net_path | abs_path | rel_path ) [ "?" query ]
  - absoluteURI
```
protected static final java.util.BitSet absoluteURI
```
    BitSet for absoluteURI.
    absoluteURI = scheme ":" ( hier_part | opaque_part )
  - URI_reference
```
protected static final java.util.BitSet URI_reference
```
    BitSet for URI-reference.
    URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
  - control
```
public static final java.util.BitSet control
```
    BitSet for control.
  - space
```
public static final java.util.BitSet space
```
    BitSet for space.
  - delims
```
public static final java.util.BitSet delims
```
    BitSet for delims.
  - unwise
```
public static final java.util.BitSet unwise
```
    BitSet for unwise.
  - disallowed_rel_path
```
public static final java.util.BitSet disallowed_rel_path
```
    Disallowed rel_path before escaping.
  - disallowed_opaque_part
```
public static final java.util.BitSet disallowed_opaque_part
```
    Disallowed opaque_part before escaping.
  - allowed_authority
```
public static final java.util.BitSet allowed_authority
```
    Those characters that are allowed for the authority component.
  - allowed_opaque_part
```
public static final java.util.BitSet allowed_opaque_part
```
    Those characters that are allowed for the opaque_part.
  - allowed_reg_name
```
public static final java.util.BitSet allowed_reg_name
```
    Those characters that are allowed for the reg_name.
  - allowed_userinfo
```
public static final java.util.BitSet allowed_userinfo
```
    Those characters that are allowed for the userinfo component.
  - allowed_within_userinfo
```
public static final java.util.BitSet allowed_within_userinfo
```
    Those characters that are allowed for within the userinfo component.
  - allowed_IPv6reference
```
public static final java.util.BitSet allowed_IPv6reference
```
    Those characters that are allowed for the IPv6reference component. The characters '[', ']' in IPv6reference should be excluded.
  - allowed_host
```
public static final java.util.BitSet allowed_host
```
    Those characters that are allowed for the host component. The characters '[', ']' in IPv6reference should be excluded.
  - allowed_within_authority
```
public static final java.util.BitSet allowed_within_authority
```
    Those characters that are allowed for the authority component.
  - allowed_abs_path
```
public static final java.util.BitSet allowed_abs_path
```
    Those characters that are allowed for the abs_path.
  - allowed_rel_path
```
public static final java.util.BitSet allowed_rel_path
```
    Those characters that are allowed for the rel_path.
  - allowed_within_path
```
public static final java.util.BitSet allowed_within_path
```
    Those characters that are allowed within the path.
  - allowed_query
```
public static final java.util.BitSet allowed_query
```
    Those characters that are allowed for the query component.
  - allowed_within_query
```
public static final java.util.BitSet allowed_within_query
```
    Those characters that are allowed within the query component.
  - allowed_fragment
```
public static final java.util.BitSet allowed_fragment
```
    Those characters that are allowed for the fragment component.
  - _is_hier_part
```
protected boolean _is_hier_part
```
  - _is_opaque_part
```
protected boolean _is_opaque_part
```
  - _is_net_path
```
protected boolean _is_net_path
```
  - _is_abs_path
```
protected boolean _is_abs_path
```
  - _is_rel_path
```
protected boolean _is_rel_path
```
  - _is_reg_name
```
protected boolean _is_reg_name
```
  - _is_server
```
protected boolean _is_server
```
  - _is_hostname
```
protected boolean _is_hostname
```
  - _is_IPv4address
```
protected boolean _is_IPv4address
```
  - _is_IPv6reference
```
protected boolean _is_IPv6reference
```
- Constructor Detail
  - URI
```
protected URI()
```
    Create an instance as an internal use
  - URI
```
public URI(java.lang.String s,
   boolean escaped,
   java.lang.String charset)
    throws URIException,
           java.lang.NullPointerException
```
    Construct a URI from a string with the given charset. The input string can be either in escaped or unescaped form.
    
    Parameters:
    s - URI character sequence
    escaped - true if URI character sequence is in escaped form. false otherwise.
    charset - the charset string to do escape encoding, if required
    
    Throws:
    
    URIException - If the URI cannot be created.
    
    java.lang.NullPointerException - if input string is null
    Since:
    
    3.0
    
    See Also:
    getProtocolCharset()
  - URI
```
public URI(java.lang.String s,
   boolean escaped)
    throws URIException,
           java.lang.NullPointerException
```
    Construct a URI from a string with the given charset. The input string can be either in escaped or unescaped form.
    
    Parameters:
    s - URI character sequence
    escaped - true if URI character sequence is in escaped form. false otherwise.
    
    Throws:
    
    URIException - If the URI cannot be created.
    
    java.lang.NullPointerException - if input string is null
    Since:
    
    3.0
    
    See Also:
    getProtocolCharset()
  - URI
```
public URI(char[] escaped,
   java.lang.String charset)
    throws URIException,
           java.lang.NullPointerException
```
    Deprecated. Use #URI(String, boolean, String)
    
    Construct a URI as an escaped form of a character array with the given charset.
    
    Parameters:
    escaped - the URI character sequence
    charset - the charset string to do escape encoding
    
    Throws:
    
    URIException - If the URI cannot be created.
    
    java.lang.NullPointerException - if escaped is null
    See Also:
    getProtocolCharset()
  - URI
```
public URI(char[] escaped)
    throws URIException,
           java.lang.NullPointerException
```
    Deprecated. Use #URI(String, boolean)
    
    Construct a URI as an escaped form of a character array. An URI can be placed within double-quotes or angle brackets like "http://test.com/" and <http://test.com/>
    
    Parameters:
    escaped - the URI character sequence
    
    Throws:
    
    URIException - If the URI cannot be created.
    
    java.lang.NullPointerException - if escaped is null
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String original,
   java.lang.String charset)
    throws URIException
```
    Deprecated. Use #URI(String, boolean, String)
    
    Construct a URI from the given string with the given charset.
    
    Parameters:
    original - the string to be represented to URI character sequence It is one of absoluteURI and relativeURI.
    charset - the charset string to do escape encoding
    
    Throws:
    
    URIException - If the URI cannot be created.
    See Also:
    getProtocolCharset()
  - URI
```
public URI(java.lang.String original)
    throws URIException
```
    Deprecated. Use #URI(String, boolean)
    Construct a URI from the given string.
    URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
    An URI can be placed within double-quotes or angle brackets like "http://test.com/" and <http://test.com/>
    Parameters:
    original - the string to be represented to URI character sequence It is one of absoluteURI and relativeURI.
    
    Throws:
    
    URIException - If the URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String schemeSpecificPart,
   java.lang.String fragment)
    throws URIException
```
    Construct a general URI from the given components.
    URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ] absoluteURI = scheme ":" ( hier_part | opaque_part ) opaque_part = uric_no_slash *uric
    It's for absolute URI = <scheme>:<scheme-specific-part># <fragment>.
    Parameters:
    scheme - the scheme string
    schemeSpecificPart - scheme_specific_part
    fragment - the fragment string
    
    Throws:
    
    URIException - If the URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String authority,
   java.lang.String path,
   java.lang.String query,
   java.lang.String fragment)
    throws URIException
```
    Construct a general URI from the given components.
    URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ] absoluteURI = scheme ":" ( hier_part | opaque_part ) relativeURI = ( net_path | abs_path | rel_path ) [ "?" query ] hier_part = ( net_path | abs_path ) [ "?" query ]
    It's for absolute URI = <scheme>:<path>?<query>#< fragment> and relative URI = <path>?<query>#<fragment >.
    Parameters:
    scheme - the scheme string
    authority - the authority string
    path - the path string
    query - the query string
    fragment - the fragment string
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String userinfo,
   java.lang.String host,
   int port)
    throws URIException
```
    Construct a general URI from the given components.
    
    Parameters:
    scheme - the scheme string
    userinfo - the userinfo string
    host - the host string
    port - the port number
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String userinfo,
   java.lang.String host,
   int port,
   java.lang.String path)
    throws URIException
```
    Construct a general URI from the given components.
    
    Parameters:
    scheme - the scheme string
    userinfo - the userinfo string
    host - the host string
    port - the port number
    path - the path string
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String userinfo,
   java.lang.String host,
   int port,
   java.lang.String path,
   java.lang.String query)
    throws URIException
```
    Construct a general URI from the given components.
    
    Parameters:
    scheme - the scheme string
    userinfo - the userinfo string
    host - the host string
    port - the port number
    path - the path string
    query - the query string
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String userinfo,
   java.lang.String host,
   int port,
   java.lang.String path,
   java.lang.String query,
   java.lang.String fragment)
    throws URIException
```
    Construct a general URI from the given components.
    
    Parameters:
    scheme - the scheme string
    userinfo - the userinfo string
    host - the host string
    port - the port number
    path - the path string
    query - the query string
    fragment - the fragment string
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(java.lang.String scheme,
   java.lang.String host,
   java.lang.String path,
   java.lang.String fragment)
    throws URIException
```
    Construct a general URI from the given components.
    
    Parameters:
    scheme - the scheme string
    host - the host string
    path - the path string
    fragment - the fragment string
    
    Throws:
    
    URIException - If the new URI cannot be created.
    See Also:
    getDefaultProtocolCharset()
  - URI
```
public URI(URI base,
   java.lang.String relative)
    throws URIException
```
    Deprecated. Use #URI(URI, String, boolean)
    
    Construct a general URI with the given relative URI string.
    
    Parameters:
    base - the base URI
    relative - the relative URI string
    
    Throws:
    
    URIException - If the new URI cannot be created.
  - URI
```
public URI(URI base,
   java.lang.String relative,
   boolean escaped)
    throws URIException
```
    Construct a general URI with the given relative URI string.
    
    Parameters:
    base - the base URI
    relative - the relative URI string
    escaped - true if URI character sequence is in escaped form. false otherwise.
    
    Throws:
    
    URIException - If the new URI cannot be created.
    Since:
    
    3.0
  - URI
```
public URI(URI base,
   URI relative)
    throws URIException
```
    Construct a general URI with the given relative URI.
    URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ] relativeURI = ( net_path | abs_path | rel_path ) [ "?" query ]
    Resolving Relative References to Absolute Form. Examples of Resolving Relative URI References Within an object with a well-defined base URI of
    http://a/b/c/d;p?q
    the relative URI would be resolved as follows: Normal Examples
    g:h = g:h g = http://a/b/c/g ./g = http://a/b/c/g g/ = http://a/b/c/g/ /g = http://a/g //g = http://g ?y = http://a/b/c/?y g?y = http://a/b/c/g?y #s = (current document)#s g#s = http://a/b/c/g#s g?y#s = http://a/b/c/g?y#s ;x = http://a/b/c/;x g;x = http://a/b/c/g;x g;x?y#s = http://a/b/c/g;x?y#s . = http://a/b/c/ ./ = http://a/b/c/ .. = http://a/b/ ../ = http://a/b/ ../g = http://a/b/g ../.. = http://a/ ../../ = http://a/ ../../g = http://a/g
    Some URI schemes do not allow a hierarchical syntax matching the syntax, and thus cannot use relative references.
    Parameters:
    base - the base URI
    relative - the relative URI
    
    Throws:
    
    URIException - If the new URI cannot be created.
- Method Detail
  - encode
```
protected static char[] encode(java.lang.String original,
            java.util.BitSet allowed,
            java.lang.String charset)
                        throws URIException
```
    Encodes URI string. This is a two mapping, one from original characters to octets, and subsequently a second from octets to URI characters:
    original character sequence->octet sequence->URI character sequence
    An escaped octet is encoded as a character triplet, consisting of the percent character "%" followed by the two hexadecimal digits representing the octet code. For example, "%20" is the escaped encoding for the US-ASCII space character.
    Conversion from the local filesystem character set to UTF-8 will normally involve a two step process. First convert the local character set to the UCS; then convert the UCS to UTF-8. The first step in the process can be performed by maintaining a mapping table that includes the local character set code and the corresponding UCS code. The next step is to convert the UCS character code to the UTF-8 encoding.
    Mapping between vendor codepages can be done in a very similar manner as described above.
    The only time escape encodings can allowedly be made is when a URI is being created from its component parts. The escape and validate methods are internally performed within this method.
    Parameters:
    original - the original character sequence
    allowed - those characters that are allowed within a component
    charset - the protocol charset
    
    Returns:
    URI character sequence
    
    Throws:
    
    URIException - null component or unsupported character encoding
  - decode
```
protected static java.lang.String decode(char[] component,
                      java.lang.String charset)
                                  throws URIException
```
    Decodes URI encoded string. This is a two mapping, one from URI characters to octets, and subsequently a second from octets to original characters:
    URI character sequence->octet sequence->original character sequence
    A URI must be separated into its components before the escaped characters within those components can be allowedly decoded.
    Notice that there is a chance that URI characters that are non UTF-8 may be parsed as valid UTF-8. A recent non-scientific analysis found that EUC encoded Japanese words had a 2.7% false reading; SJIS had a 0.0005% false reading; other encoding such as ASCII or KOI-8 have a 0% false reading.
    The percent "%" character always has the reserved purpose of being the escape indicator, it must be escaped as "%25" in order to be used as data within a URI.
    The unescape method is internally performed within this method.
    Parameters:
    component - the URI character sequence
    charset - the protocol charset
    
    Returns:
    original character sequence
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
  - decode
```
protected static java.lang.String decode(java.lang.String component,
                      java.lang.String charset)
                                  throws URIException
```
    Decodes URI encoded string. This is a two mapping, one from URI characters to octets, and subsequently a second from octets to original characters:
    URI character sequence->octet sequence->original character sequence
    A URI must be separated into its components before the escaped characters within those components can be allowedly decoded.
    Notice that there is a chance that URI characters that are non UTF-8 may be parsed as valid UTF-8. A recent non-scientific analysis found that EUC encoded Japanese words had a 2.7% false reading; SJIS had a 0.0005% false reading; other encoding such as ASCII or KOI-8 have a 0% false reading.
    The percent "%" character always has the reserved purpose of being the escape indicator, it must be escaped as "%25" in order to be used as data within a URI.
    The unescape method is internally performed within this method.
    Parameters:
    component - the URI character sequence
    charset - the protocol charset
    
    Returns:
    original character sequence
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    Since:
    
    3.0
  - prevalidate
```
protected boolean prevalidate(java.lang.String component,
                  java.util.BitSet disallowed)
```
    Pre-validate the unescaped URI string within a specific component.
    
    Parameters:
    component - the component string within the component
    disallowed - those characters disallowed within the component
    
    Returns:
    if true, it doesn't have the disallowed characters if false, the component is undefined or an incorrect one
  - validate
```
protected boolean validate(char[] component,
               java.util.BitSet generous)
```
    Validate the URI characters within a specific component. The component must be performed after escape encoding. Or it doesn't include escaped characters.
    
    Parameters:
    component - the characters sequence within the component
    generous - those characters that are allowed within a component
    
    Returns:
    if true, it's the correct URI character sequence
  - validate
```
protected boolean validate(char[] component,
               int soffset,
               int eoffset,
               java.util.BitSet generous)
```
    Validate the URI characters within a specific component. The component must be performed after escape encoding. Or it doesn't include escaped characters.
    It's not that much strict, generous. The strict validation might be performed before being called this method.
    
    Parameters:
    component - the characters sequence within the component
    soffset - the starting offset of the given component
    eoffset - the ending offset of the given component if -1, it means the length of the component
    generous - those characters that are allowed within a component
    
    Returns:
    if true, it's the correct URI character sequence
  - parseUriReference
```
protected void parseUriReference(java.lang.String original,
                     boolean escaped)
                          throws URIException
```
    In order to avoid any possilbity of conflict with non-ASCII characters, Parse a URI reference as a String with the character encoding of the local system or the document.
    The following line is the regular expression for breaking-down a URI reference into its components.
    ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))? 12 3 4 5 6 7 8 9
    For example, matching the above expression to http://jakarta.apache.org/ietf/uri/#Related results in the following subexpression matches:
    $1 = http: scheme = $2 = http $3 = //jakarta.apache.org authority = $4 = jakarta.apache.org path = $5 = /ietf/uri/ $6 = query = $7 = $8 = #Related fragment = $9 = Related
    Parameters:
    original - the original character sequence
    escaped - true if original is escaped
    
    Throws:
    
    URIException - If an error occurs.
  - indexFirstOf
```
protected int indexFirstOf(java.lang.String s,
               java.lang.String delims)
```
    Get the earlier index that to be searched for the first occurrance in one of any of the given string.
    
    Parameters:
    s - the string to be indexed
    delims - the delimiters used to index
    
    Returns:
    the earlier index if there are delimiters
  - indexFirstOf
```
protected int indexFirstOf(java.lang.String s,
               java.lang.String delims,
               int offset)
```
    Get the earlier index that to be searched for the first occurrance in one of any of the given string.
    
    Parameters:
    s - the string to be indexed
    delims - the delimiters used to index
    offset - the from index
    
    Returns:
    the earlier index if there are delimiters
  - indexFirstOf
```
protected int indexFirstOf(char[] s,
               char delim)
```
    Get the earlier index that to be searched for the first occurrance in one of any of the given array.
    
    Parameters:
    s - the character array to be indexed
    delim - the delimiter used to index
    
    Returns:
    the ealier index if there are a delimiter
  - indexFirstOf
```
protected int indexFirstOf(char[] s,
               char delim,
               int offset)
```
    Get the earlier index that to be searched for the first occurrance in one of any of the given array.
    
    Parameters:
    s - the character array to be indexed
    delim - the delimiter used to index
    offset - The offset.
    
    Returns:
    the ealier index if there is a delimiter
  - parseAuthority
```
protected void parseAuthority(java.lang.String original,
                  boolean escaped)
                       throws URIException
```
    Parse the authority component.
    
    Parameters:
    original - the original character sequence of authority component
    escaped - true if original is escaped
    
    Throws:
    
    URIException - If an error occurs.
  - setURI
```
protected void setURI()
```
    Once it's parsed successfully, set this URI.
    
    See Also:
    getRawURI()
  - isAbsoluteURI
```
public boolean isAbsoluteURI()
```
    Tell whether or not this URI is absolute.
    
    Returns:
    true iif this URI is absoluteURI
  - isRelativeURI
```
public boolean isRelativeURI()
```
    Tell whether or not this URI is relative.
    
    Returns:
    true iif this URI is relativeURI
  - isHierPart
```
public boolean isHierPart()
```
    Tell whether or not the absoluteURI of this URI is hier_part.
    
    Returns:
    true iif the absoluteURI is hier_part
  - isOpaquePart
```
public boolean isOpaquePart()
```
    Tell whether or not the absoluteURI of this URI is opaque_part.
    
    Returns:
    true iif the absoluteURI is opaque_part
  - isNetPath
```
public boolean isNetPath()
```
    Tell whether or not the relativeURI or heir_part of this URI is net_path. It's the same function as the has_authority() method.
    
    Returns:
    true iif the relativeURI or heir_part is net_path
    See Also:
    hasAuthority()
  - isAbsPath
```
public boolean isAbsPath()
```
    Tell whether or not the relativeURI or hier_part of this URI is abs_path.
    
    Returns:
    true iif the relativeURI or hier_part is abs_path
  - isRelPath
```
public boolean isRelPath()
```
    Tell whether or not the relativeURI of this URI is rel_path.
    
    Returns:
    true iif the relativeURI is rel_path
  - hasAuthority
```
public boolean hasAuthority()
```
    Tell whether or not this URI has authority. It's the same function as the is_net_path() method.
    
    Returns:
    true iif this URI has authority
    See Also:
    isNetPath()
  - isRegName
```
public boolean isRegName()
```
    Tell whether or not the authority component of this URI is reg_name.
    
    Returns:
    true iif the authority component is reg_name
  - isServer
```
public boolean isServer()
```
    Tell whether or not the authority component of this URI is server.
    
    Returns:
    true iif the authority component is server
  - hasUserinfo
```
public boolean hasUserinfo()
```
    Tell whether or not this URI has userinfo.
    
    Returns:
    true iif this URI has userinfo
  - isHostname
```
public boolean isHostname()
```
    Tell whether or not the host part of this URI is hostname.
    
    Returns:
    true iif the host part is hostname
  - isIPv4address
```
public boolean isIPv4address()
```
    Tell whether or not the host part of this URI is IPv4address.
    
    Returns:
    true iif the host part is IPv4address
  - isIPv6reference
```
public boolean isIPv6reference()
```
    Tell whether or not the host part of this URI is IPv6reference.
    
    Returns:
    true iif the host part is IPv6reference
  - hasQuery
```
public boolean hasQuery()
```
    Tell whether or not this URI has query.
    
    Returns:
    true iif this URI has query
  - hasFragment
```
public boolean hasFragment()
```
    Tell whether or not this URI has fragment.
    
    Returns:
    true iif this URI has fragment
  - setDefaultProtocolCharset
```
public static void setDefaultProtocolCharset(java.lang.String charset)
                                      throws URI.DefaultCharsetChanged
```
    Set the default charset of the protocol.
    The character set used to store files SHALL remain a local decision and MAY depend on the capability of local operating systems. Prior to the exchange of URIs they SHOULD be converted into a ISO/IEC 10646 format and UTF-8 encoded. This approach, while allowing international exchange of URIs, will still allow backward compatibility with older systems because the code set positions for ASCII characters are identical to the one byte sequence in UTF-8.
    An individual URI scheme may require a single charset, define a default charset, or provide a way to indicate the charset used.
    Always all the time, the setter method is always succeeded and throws DefaultCharsetChanged exception. So API programmer must follow the following way:
```
  import org.apache.util.URI$DefaultCharsetChanged;
      .
      .
      .
  try {
      URI.setDefaultProtocolCharset("UTF-8");
  } catch (DefaultCharsetChanged cc) {
      // CASE 1: the exception could be ignored, when it is set by user
      if (cc.getReasonCode() == DefaultCharsetChanged.PROTOCOL_CHARSET) {
      // CASE 2: let user know the default protocol charset changed
      } else {
      // CASE 2: let user know the default document charset changed
      }
  }
  
```
    The API programmer is responsible to set the correct charset. And each application should remember its own charset to support.
    Parameters:
    charset - the default charset for each protocol
    
    Throws:
    
    URI.DefaultCharsetChanged - default charset changed
  - getDefaultProtocolCharset
```
public static java.lang.String getDefaultProtocolCharset()
```
    Get the default charset of the protocol.
    An individual URI scheme may require a single charset, define a default charset, or provide a way to indicate the charset used.
    To work globally either requires support of a number of character sets and to be able to convert between them, or the use of a single preferred character set. For support of global compatibility it is STRONGLY RECOMMENDED that clients and servers use UTF-8 encoding when exchanging URIs.
    
    Returns:
    the default charset string
  - getProtocolCharset
```
public java.lang.String getProtocolCharset()
```
    Get the protocol charset used by this current URI instance. It was set by the constructor for this instance. If it was not set by contructor, it will return the default protocol charset.
    
    Returns:
    the protocol charset string
    See Also:
    getDefaultProtocolCharset()
  - setDefaultDocumentCharset
```
public static void setDefaultDocumentCharset(java.lang.String charset)
                                      throws URI.DefaultCharsetChanged
```
    Set the default charset of the document.
    Notice that it will be possible to contain mixed characters (e.g. ftp://host/KoreanNamespace/ChineseResource). To handle the Bi-directional display of these character sets, the protocol charset could be simply used again. Because it's not yet implemented that the insertion of BIDI control characters at different points during composition is extracted.
    Always all the time, the setter method is always succeeded and throws DefaultCharsetChanged exception. So API programmer must follow the following way:
```
  import org.apache.util.URI$DefaultCharsetChanged;
      .
      .
      .
  try {
      URI.setDefaultDocumentCharset("EUC-KR");
  } catch (DefaultCharsetChanged cc) {
      // CASE 1: the exception could be ignored, when it is set by user
      if (cc.getReasonCode() == DefaultCharsetChanged.DOCUMENT_CHARSET) {
      // CASE 2: let user know the default document charset changed
      } else {
      // CASE 2: let user know the default protocol charset changed
      }
  }
  
```
    The API programmer is responsible to set the correct charset. And each application should remember its own charset to support.
    Parameters:
    charset - the default charset for the document
    
    Throws:
    
    URI.DefaultCharsetChanged - default charset changed
  - getDefaultDocumentCharset
```
public static java.lang.String getDefaultDocumentCharset()
```
    Get the recommended default charset of the document.
    
    Returns:
    the default charset string
  - getDefaultDocumentCharsetByLocale
```
public static java.lang.String getDefaultDocumentCharsetByLocale()
```
    Get the default charset of the document by locale.
    
    Returns:
    the default charset string by locale
  - getDefaultDocumentCharsetByPlatform
```
public static java.lang.String getDefaultDocumentCharsetByPlatform()
```
    Get the default charset of the document by platform.
    
    Returns:
    the default charset string by platform
  - getRawScheme
```
public char[] getRawScheme()
```
    Get the scheme.
    
    Returns:
    the scheme
  - getScheme
```
public java.lang.String getScheme()
```
    Get the scheme.
    
    Returns:
    the scheme null if undefined scheme
  - setRawAuthority
```
public void setRawAuthority(char[] escapedAuthority)
                     throws URIException,
                            java.lang.NullPointerException
```
    Set the authority. It can be one type of server, hostport, hostname, IPv4address, IPv6reference and reg_name.
    authority = server | reg_name
    Parameters:
    escapedAuthority - the raw escaped authority
    
    Throws:
    
    URIException - If parseAuthority(java.lang.String,boolean) fails
    
    java.lang.NullPointerException - null authority
  - setEscapedAuthority
```
public void setEscapedAuthority(java.lang.String escapedAuthority)
                         throws URIException
```
    Set the authority. It can be one type of server, hostport, hostname, IPv4address, IPv6reference and reg_name. Note that there is no setAuthority method by the escape encoding reason.
    
    Parameters:
    escapedAuthority - the escaped authority string
    
    Throws:
    
    URIException - If parseAuthority(java.lang.String,boolean) fails
  - getRawAuthority
```
public char[] getRawAuthority()
```
    Get the raw-escaped authority.
    
    Returns:
    the raw-escaped authority
  - getEscapedAuthority
```
public java.lang.String getEscapedAuthority()
```
    Get the escaped authority.
    
    Returns:
    the escaped authority
  - getAuthority
```
public java.lang.String getAuthority()
                              throws URIException
```
    Get the authority.
    
    Returns:
    the authority
    
    Throws:
    
    URIException - If decode(char[], java.lang.String) fails
  - getRawUserinfo
```
public char[] getRawUserinfo()
```
    Get the raw-escaped userinfo.
    
    Returns:
    the raw-escaped userinfo
    See Also:
    getAuthority()
  - getEscapedUserinfo
```
public java.lang.String getEscapedUserinfo()
```
    Get the escaped userinfo.
    
    Returns:
    the escaped userinfo
    See Also:
    getAuthority()
  - getUserinfo
```
public java.lang.String getUserinfo()
                             throws URIException
```
    Get the userinfo.
    
    Returns:
    the userinfo
    
    Throws:
    
    URIException - If decode(char[], java.lang.String) fails
    See Also:
    getAuthority()
  - getRawHost
```
public char[] getRawHost()
```
    Get the host.
    host = hostname | IPv4address | IPv6reference
    Returns:
    the host
    See Also:
    getAuthority()
  - getHost
```
public java.lang.String getHost()
                         throws URIException
```
    Get the host.
    host = hostname | IPv4address | IPv6reference
    Returns:
    the host
    
    Throws:
    
    URIException - If decode(char[], java.lang.String) fails
    See Also:
    getAuthority()
  - getPort
```
public int getPort()
```
    Get the port. In order to get the specfic default port, the specific protocol-supported class extended from the URI class should be used. It has the server-based naming authority.
    
    Returns:
    the port if -1, it has the default port for the scheme or the server-based naming authority is not supported in the specific URI.
  - setRawPath
```
public void setRawPath(char[] escapedPath)
                throws URIException
```
    Set the raw-escaped path.
    
    Parameters:
    escapedPath - the path character sequence
    
    Throws:
    
    URIException - encoding error or not proper for initial instance
    See Also:
    encode(java.lang.String, java.util.BitSet, java.lang.String)
  - setEscapedPath
```
public void setEscapedPath(java.lang.String escapedPath)
                    throws URIException
```
    Set the escaped path.
    
    Parameters:
    escapedPath - the escaped path string
    
    Throws:
    
    URIException - encoding error or not proper for initial instance
    See Also:
    encode(java.lang.String, java.util.BitSet, java.lang.String)
  - setPath
```
public void setPath(java.lang.String path)
             throws URIException
```
    Set the path.
    
    Parameters:
    path - the path string
    
    Throws:
    
    URIException - set incorrectly or fragment only
    See Also:
    encode(java.lang.String, java.util.BitSet, java.lang.String)
  - resolvePath
```
protected char[] resolvePath(char[] basePath,
                 char[] relPath)
                      throws URIException
```
    Resolve the base and relative path.
    
    Parameters:
    basePath - a character array of the basePath
    relPath - a character array of the relPath
    
    Returns:
    the resolved path
    
    Throws:
    
    URIException - no more higher path level to be resolved
  - getRawCurrentHierPath
```
protected char[] getRawCurrentHierPath(char[] path)
                                throws URIException
```
    Get the raw-escaped current hierarchy level in the given path. If the last namespace is a collection, the slash mark ('/') should be ended with at the last character of the path string.
    
    Parameters:
    path - the path
    
    Returns:
    the current hierarchy level
    
    Throws:
    
    URIException - no hierarchy level
  - getRawCurrentHierPath
```
public char[] getRawCurrentHierPath()
                             throws URIException
```
    Get the raw-escaped current hierarchy level.
    
    Returns:
    the raw-escaped current hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
  - getEscapedCurrentHierPath
```
public java.lang.String getEscapedCurrentHierPath()
                                           throws URIException
```
    Get the escaped current hierarchy level.
    
    Returns:
    the escaped current hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
  - getCurrentHierPath
```
public java.lang.String getCurrentHierPath()
                                    throws URIException
```
    Get the current hierarchy level.
    
    Returns:
    the current hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
    See Also:
    decode(char[], java.lang.String)
  - getRawAboveHierPath
```
public char[] getRawAboveHierPath()
                           throws URIException
```
    Get the level above the this hierarchy level.
    
    Returns:
    the raw above hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
  - getEscapedAboveHierPath
```
public java.lang.String getEscapedAboveHierPath()
                                         throws URIException
```
    Get the level above the this hierarchy level.
    
    Returns:
    the raw above hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
  - getAboveHierPath
```
public java.lang.String getAboveHierPath()
                                  throws URIException
```
    Get the level above the this hierarchy level.
    
    Returns:
    the above hierarchy level
    
    Throws:
    
    URIException - If getRawCurrentHierPath(char[]) fails.
    See Also:
    decode(char[], java.lang.String)
  - getRawPath
```
public char[] getRawPath()
```
    Get the raw-escaped path.
    path = [ abs_path | opaque_part ]
    Returns:
    the raw-escaped path
  - getEscapedPath
```
public java.lang.String getEscapedPath()
```
    Get the escaped path.
    path = [ abs_path | opaque_part ] abs_path = "/" path_segments opaque_part = uric_no_slash *uric
    Returns:
    the escaped path string
  - getPath
```
public java.lang.String getPath()
                         throws URIException
```
    Get the path.
    path = [ abs_path | opaque_part ]
    Returns:
    the path string
    
    Throws:
    
    URIException - If decode(char[], java.lang.String) fails.
    See Also:
    decode(char[], java.lang.String)
  - getRawName
```
public char[] getRawName()
```
    Get the raw-escaped basename of the path.
    
    Returns:
    the raw-escaped basename
  - getEscapedName
```
public java.lang.String getEscapedName()
```
    Get the escaped basename of the path.
    
    Returns:
    the escaped basename string
  - getName
```
public java.lang.String getName()
                         throws URIException
```
    Get the basename of the path.
    
    Returns:
    the basename string
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    decode(char[], java.lang.String)
  - getRawPathQuery
```
public char[] getRawPathQuery()
```
    Get the raw-escaped path and query.
    
    Returns:
    the raw-escaped path and query
  - getEscapedPathQuery
```
public java.lang.String getEscapedPathQuery()
```
    Get the escaped query.
    
    Returns:
    the escaped path and query string
  - getPathQuery
```
public java.lang.String getPathQuery()
                              throws URIException
```
    Get the path and query.
    
    Returns:
    the path and query string.
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    decode(char[], java.lang.String)
  - setRawQuery
```
public void setRawQuery(char[] escapedQuery)
                 throws URIException
```
    Set the raw-escaped query.
    
    Parameters:
    escapedQuery - the raw-escaped query
    
    Throws:
    
    URIException - escaped query not valid
  - setEscapedQuery
```
public void setEscapedQuery(java.lang.String escapedQuery)
                     throws URIException
```
    Set the escaped query string.
    
    Parameters:
    escapedQuery - the escaped query string
    
    Throws:
    
    URIException - escaped query not valid
  - setQuery
```
public void setQuery(java.lang.String query)
              throws URIException
```
    Set the query.
    When a query string is not misunderstood the reserved special characters ("&", "=", "+", ",", and "$") within a query component, it is recommended to use in encoding the whole query with this method.
    The additional APIs for the special purpose using by the reserved special characters used in each protocol are implemented in each protocol classes inherited from URI. So refer to the same-named APIs implemented in each specific protocol instance.
    
    Parameters:
    query - the query string.
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    encode(java.lang.String, java.util.BitSet, java.lang.String)
  - getRawQuery
```
public char[] getRawQuery()
```
    Get the raw-escaped query.
    
    Returns:
    the raw-escaped query
  - getEscapedQuery
```
public java.lang.String getEscapedQuery()
```
    Get the escaped query.
    
    Returns:
    the escaped query string
  - getQuery
```
public java.lang.String getQuery()
                          throws URIException
```
    Get the query.
    
    Returns:
    the query string.
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    decode(char[], java.lang.String)
  - setRawFragment
```
public void setRawFragment(char[] escapedFragment)
                    throws URIException
```
    Set the raw-escaped fragment.
    
    Parameters:
    escapedFragment - the raw-escaped fragment
    
    Throws:
    
    URIException - escaped fragment not valid
  - setEscapedFragment
```
public void setEscapedFragment(java.lang.String escapedFragment)
                        throws URIException
```
    Set the escaped fragment string.
    
    Parameters:
    escapedFragment - the escaped fragment string
    
    Throws:
    
    URIException - escaped fragment not valid
  - setFragment
```
public void setFragment(java.lang.String fragment)
                 throws URIException
```
    Set the fragment.
    
    Parameters:
    fragment - the fragment string.
    
    Throws:
    
    URIException - If an error occurs.
  - getRawFragment
```
public char[] getRawFragment()
```
    Get the raw-escaped fragment.
    The optional fragment identifier is not part of a URI, but is often used in conjunction with a URI.
    The format and interpretation of fragment identifiers is dependent on the media type [RFC2046] of the retrieval result.
    A fragment identifier is only meaningful when a URI reference is intended for retrieval and the result of that retrieval is a document for which the identified fragment is consistently defined.
    
    Returns:
    the raw-escaped fragment
  - getEscapedFragment
```
public java.lang.String getEscapedFragment()
```
    Get the escaped fragment.
    
    Returns:
    the escaped fragment string
  - getFragment
```
public java.lang.String getFragment()
                             throws URIException
```
    Get the fragment.
    
    Returns:
    the fragment string
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    decode(char[], java.lang.String)
  - removeFragmentIdentifier
```
protected char[] removeFragmentIdentifier(char[] component)
```
    Remove the fragment identifier of the given component.
    
    Parameters:
    component - the component that a fragment may be included
    
    Returns:
    the component that the fragment identifier is removed
  - normalize
```
protected char[] normalize(char[] path)
                    throws URIException
```
    Normalize the given hier path part.
    Algorithm taken from URI reference parser at http://www.apache.org/~fielding/uri/rev-2002/issues.html.
    
    Parameters:
    path - the path to normalize
    
    Returns:
    the normalized path
    
    Throws:
    
    URIException - no more higher path level to be normalized
  - normalize
```
public void normalize()
               throws URIException
```
    Normalizes the path part of this URI. Normalization is only meant to be performed on URIs with an absolute path. Calling this method on a relative path URI will have no effect.
    
    Throws:
    
    URIException - no more higher path level to be normalized
    See Also:
    isAbsPath()
  - equals
```
protected boolean equals(char[] first,
             char[] second)
```
    Test if the first array is equal to the second array.
    
    Parameters:
    first - the first character array
    second - the second character array
    
    Returns:
    true if they're equal
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Test an object if this URI is equal to another.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    obj - an object to compare
    
    Returns:
    true if two URI objects are equal
  - hashCode
```
public int hashCode()
```
    Return a hash code for this URI.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    a has code value for this URI
  - compareTo
```
public int compareTo(java.lang.Object obj)
              throws java.lang.ClassCastException
```
    Compare this URI to another object.
    
    Specified by:
    
    compareTo in interface java.lang.Comparable
    
    Parameters:
    obj - the object to be compared.
    
    Returns:
    0, if it's same, -1, if failed, first being compared with in the authority component
    
    Throws:
    
    java.lang.ClassCastException - not URI argument
  - clone
```
public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException
```
    Create and return a copy of this object, the URI-reference containing the userinfo component. Notice that the whole URI-reference including the userinfo component counld not be gotten as a String.
    To copy the identical URI object including the userinfo component, it should be used.
    
    Overrides:
    
    clone in class java.lang.Object
    
    Returns:
    a clone of this instance
    
    Throws:
    
    java.lang.CloneNotSupportedException
  - getRawURI
```
public char[] getRawURI()
```
    It can be gotten the URI character sequence. It's raw-escaped. For the purpose of the protocol to be transported, it will be useful.
    It is clearly unwise to use a URL that contains a password which is intended to be secret. In particular, the use of a password within the 'userinfo' component of a URL is strongly disrecommended except in those rare cases where the 'password' parameter is intended to be public.
    When you want to get each part of the userinfo, you need to use the specific methods in the specific URL. It depends on the specific URL.
    
    Returns:
    the URI character sequence
  - getEscapedURI
```
public java.lang.String getEscapedURI()
```
    It can be gotten the URI character sequence. It's escaped. For the purpose of the protocol to be transported, it will be useful.
    
    Returns:
    the escaped URI string
  - getURI
```
public java.lang.String getURI()
                        throws URIException
```
    It can be gotten the URI character sequence.
    
    Returns:
    the original URI string
    
    Throws:
    
    URIException - incomplete trailing escape pattern or unsupported character encoding
    See Also:
    decode(char[], java.lang.String)
  - getRawURIReference
```
public char[] getRawURIReference()
```
    Get the URI reference character sequence.
    
    Returns:
    the URI reference character sequence
  - getEscapedURIReference
```
public java.lang.String getEscapedURIReference()
```
    Get the escaped URI reference string.
    
    Returns:
    the escaped URI reference string
  - getURIReference
```
public java.lang.String getURIReference()
                                 throws URIException
```
    Get the original URI reference string.
    
    Returns:
    the original URI reference string
    
    Throws:
    
    URIException - If decode(char[], java.lang.String) fails.
  - toString
```
public java.lang.String toString()
```
    Get the escaped URI string.
    On the document, the URI-reference form is only used without the userinfo component like http://jakarta.apache.org/ by the security reason. But the URI-reference form with the userinfo component could be parsed.
    In other words, this URI and any its subclasses must not expose the URI-reference expression with the userinfo component like http://user:password@hostport/restricted_zone.
    It means that the API client programmer should extract each user and password to access manually. Probably it will be supported in the each subclass, however, not a whole URI-reference expression.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    the escaped URI string
    See Also:
    clone()

Class URI

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

hash

_uri

protocolCharset

defaultProtocolCharset

defaultDocumentCharset

defaultDocumentCharsetByLocale

defaultDocumentCharsetByPlatform

_scheme

_opaque

_authority

_userinfo

_host

_port

_path

_query

_fragment

rootPath

percent

digit

alpha

alphanum

hex

escaped

mark

unreserved

reserved

uric

fragment

query

pchar

param

segment

path_segments

abs_path

uric_no_slash

opaque_part

path

port

IPv4address

IPv6address

IPv6reference

toplabel

domainlabel

hostname

host

hostport

userinfo

within_userinfo

server

reg_name

authority

scheme

rel_segment

rel_path

net_path

hier_part

relativeURI

absoluteURI

URI_reference

control

space

delims

unwise

disallowed_rel_path

disallowed_opaque_part

allowed_authority

allowed_opaque_part

allowed_reg_name

allowed_userinfo

allowed_within_userinfo

allowed_IPv6reference

allowed_host

allowed_within_authority