Knopflerfish OSGi 5.2.0

org.osgi.service.dmt
Class DmtData

java.lang.Object
  extended by org.osgi.service.dmt.DmtData

public final class DmtData
extends java.lang.Object

An immutable data structure representing the contents of a leaf or interior node. This structure represents only the value and the format property of the node, all other properties (like MIME type) can be set and read using the DmtSession interface.

Different constructors are available to create nodes with different formats. Nodes of null format can be created using the static NULL_VALUE constant instance of this class.

FORMAT_RAW_BINARY and FORMAT_RAW_STRING enable the support of future data formats. When using these formats, the actual format name is specified as a String. The application is responsible for the proper encoding of the data according to the specified format.

Author:
$Id: 8e6d3187b802cdc3e5ee7cc3dce841797479dd93 $
Immutable

Field Summary
static DmtData FALSE_VALUE
          Constant instance representing a boolean false value.
static int FORMAT_BASE64
          The node holds an OMA DM b64 value.
static int FORMAT_BINARY
          The node holds an OMA DM bin value.
static int FORMAT_BOOLEAN
          The node holds an OMA DM bool value.
static int FORMAT_DATE
          The node holds an OMA DM date value.
static int FORMAT_DATE_TIME
          The node holds a Date object.
static int FORMAT_FLOAT
          The node holds an OMA DM float value.
static int FORMAT_INTEGER
          The node holds an OMA DM int value.
static int FORMAT_LONG
          The node holds a long value.
static int FORMAT_NODE
          Format specifier of an internal node.
static int FORMAT_NULL
          The node holds an OMA DM null value.
static int FORMAT_RAW_BINARY
          The node holds raw protocol data encoded in binary format.
static int FORMAT_RAW_STRING
          The node holds raw protocol data encoded as String.
static int FORMAT_STRING
          The node holds an OMA DM chr value.
static int FORMAT_TIME
          The node holds an OMA DM time value.
static int FORMAT_XML
          The node holds an OMA DM xml value.
static DmtData NULL_VALUE
          Constant instance representing a leaf node of null format.
static DmtData TRUE_VALUE
          Constant instance representing a boolean true value.
 
Constructor Summary
DmtData(boolean bool)
          Create a DmtData instance of bool format and set its value.
DmtData(byte[] bytes)
          Create a DmtData instance of bin format and set its value.
DmtData(byte[] bytes, boolean base64)
          Create a DmtData instance of bin or b64 format and set its value.
DmtData(byte[] bytes, int format)
          Create a DmtData instance of the specified format and set its value based on the given byte[].
DmtData(java.util.Date date)
          Create a DmtData instance of dateTime format with the given Date value.
DmtData(float flt)
          Create a DmtData instance of float format and set its value.
DmtData(int integer)
          Create a DmtData instance of int format and set its value.
DmtData(long lng)
          Create a DmtData instance of long format and set its value.
DmtData(java.lang.Object complex)
          Create a DmtData instance of node format with the given object value.
DmtData(java.lang.String string)
          Create a DmtData instance of chr format with the given string value.
DmtData(java.lang.String formatName, byte[] data)
          Create a DmtData instance in FORMAT_RAW_BINARY format.
DmtData(java.lang.String value, int format)
          Create a DmtData instance of the specified format and set its value based on the given string.
DmtData(java.lang.String formatName, java.lang.String data)
          Create a DmtData instance in FORMAT_RAW_STRING format.
 
Method Summary
 boolean equals(java.lang.Object obj)
          Compares the specified object with this DmtData instance.
 byte[] getBase64()
          Gets the value of a node with base 64 (b64) format.
 byte[] getBinary()
          Gets the value of a node with binary (bin) format.
 boolean getBoolean()
          Gets the value of a node with boolean (bool) format.
 java.lang.String getDate()
          Gets the value of a node with date format.
 java.util.Date getDateTime()
          Gets the value of a node with dateTime format.
 float getFloat()
          Gets the value of a node with float format.
 int getFormat()
          Get the node's format, expressed in terms of type constants defined in this class.
 java.lang.String getFormatName()
          Returns the format of this DmtData as String.
 int getInt()
          Gets the value of a node with integer (int) format.
 long getLong()
          Gets the value of a node with long format.
 java.lang.Object getNode()
          Gets the complex data associated with an interior node (node format).
 byte[] getRawBinary()
          Gets the value of a node in raw binary (FORMAT_RAW_BINARY) format.
 java.lang.String getRawString()
          Gets the value of a node in raw String ( FORMAT_RAW_STRING) format.
 int getSize()
          Get the size of the data.
 java.lang.String getString()
          Gets the value of a node with string (chr) format.
 java.lang.String getTime()
          Gets the value of a node with time format.
 java.lang.String getXml()
          Gets the value of a node with xml format.
 int hashCode()
          Returns the hash code value for this DmtData instance.
 java.lang.String toString()
          Gets the string representation of the DmtData.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

FORMAT_INTEGER

public static final int FORMAT_INTEGER
The node holds an OMA DM int value.

See Also:
Constant Field Values

FORMAT_FLOAT

public static final int FORMAT_FLOAT
The node holds an OMA DM float value.

See Also:
Constant Field Values

FORMAT_STRING

public static final int FORMAT_STRING
The node holds an OMA DM chr value.

See Also:
Constant Field Values

FORMAT_BOOLEAN

public static final int FORMAT_BOOLEAN
The node holds an OMA DM bool value.

See Also:
Constant Field Values

FORMAT_DATE

public static final int FORMAT_DATE
The node holds an OMA DM date value.

See Also:
Constant Field Values

FORMAT_TIME

public static final int FORMAT_TIME
The node holds an OMA DM time value.

See Also:
Constant Field Values

FORMAT_BINARY

public static final int FORMAT_BINARY
The node holds an OMA DM bin value. The value of the node corresponds to the Java byte[] type.

See Also:
Constant Field Values

FORMAT_BASE64

public static final int FORMAT_BASE64
The node holds an OMA DM b64 value. Like FORMAT_BINARY, this format is also represented by the Java byte[] type, the difference is only in the corresponding OMA DM format. This format does not affect the internal storage format of the data as byte[]. It is intended as a hint for the external representation of this data. Protocol Adapters can use this hint for their further processing.

See Also:
Constant Field Values

FORMAT_XML

public static final int FORMAT_XML
The node holds an OMA DM xml value.

See Also:
Constant Field Values

FORMAT_NULL

public static final int FORMAT_NULL
The node holds an OMA DM null value. This corresponds to the Java null type.

See Also:
Constant Field Values

FORMAT_NODE

public static final int FORMAT_NODE
Format specifier of an internal node. An interior node can hold a Java object as value (see DmtData(Object) and getNode()). This value can be used by Java programs that know a specific URI understands the associated Java type. This type is further used as a return value of the MetaNode.getFormat() method for interior nodes.

See Also:
Constant Field Values

FORMAT_RAW_STRING

public static final int FORMAT_RAW_STRING
The node holds raw protocol data encoded as String. The getFormatName() method can be used to get the actual format name.

See Also:
Constant Field Values

FORMAT_RAW_BINARY

public static final int FORMAT_RAW_BINARY
The node holds raw protocol data encoded in binary format. The getFormatName() method can be used to get the actual format name.

See Also:
Constant Field Values

FORMAT_LONG

public static final int FORMAT_LONG
The node holds a long value. The getFormatName() method can be used to get the actual format name.

Since:
2.0
See Also:
Constant Field Values

FORMAT_DATE_TIME

public static final int FORMAT_DATE_TIME
The node holds a Date object. If the getTime() equals zero then the date time is not known. If the getTime() is negative it must be interpreted as a relative number of milliseconds.

Since:
2.0
See Also:
Constant Field Values

NULL_VALUE

public static final DmtData NULL_VALUE
Constant instance representing a leaf node of null format.


TRUE_VALUE

public static final DmtData TRUE_VALUE
Constant instance representing a boolean true value.

Since:
2.0

FALSE_VALUE

public static final DmtData FALSE_VALUE
Constant instance representing a boolean false value.

Since:
2.0
Constructor Detail

DmtData

public DmtData(java.lang.String string)
Create a DmtData instance of chr format with the given string value. The null string argument is valid.

Parameters:
string - the string value to set

DmtData

public DmtData(java.util.Date date)
Create a DmtData instance of dateTime format with the given Date value. The given Date value must be a non-null Date object.

Parameters:
date - the Date object to set

DmtData

public DmtData(java.lang.Object complex)
Create a DmtData instance of node format with the given object value. The value represents complex data associated with an interior node.

Certain interior nodes can support access to their subtrees through such complex values, making it simpler to retrieve or update all leaf nodes in a subtree.

The given value must be a non-null immutable object.

Parameters:
complex - the complex data object to set

DmtData

public DmtData(java.lang.String value,
               int format)
Create a DmtData instance of the specified format and set its value based on the given string. Only the following string-based formats can be created using this constructor: * The null string argument is only valid if the format is string or XML.

Parameters:
value - the string, XML, date, or time value to set
format - the format of the DmtData instance to be created, must be one of the formats specified above
Throws:
java.lang.IllegalArgumentException - if format is not one of the allowed formats, or value is not a valid string for the given format
java.lang.NullPointerException - if a string, XML, date, or time is constructed and value is null

DmtData

public DmtData(int integer)
Create a DmtData instance of int format and set its value.

Parameters:
integer - the integer value to set

DmtData

public DmtData(float flt)
Create a DmtData instance of float format and set its value.

Parameters:
flt - the float value to set

DmtData

public DmtData(long lng)
Create a DmtData instance of long format and set its value.

Parameters:
lng - the long value to set
Since:
2.0

DmtData

public DmtData(boolean bool)
Create a DmtData instance of bool format and set its value.

Parameters:
bool - the boolean value to set

DmtData

public DmtData(byte[] bytes)
Create a DmtData instance of bin format and set its value.

Parameters:
bytes - the byte array to set, must not be null
Throws:
java.lang.NullPointerException - if bytes is null

DmtData

public DmtData(byte[] bytes,
               boolean base64)
Create a DmtData instance of bin or b64 format and set its value. The chosen format is specified by the base64 parameter.

Parameters:
bytes - the byte array to set, must not be null
base64 - if true, the new instance will have b64 format, if false, it will have bin format
Throws:
java.lang.NullPointerException - if bytes is null

DmtData

public DmtData(byte[] bytes,
               int format)
Create a DmtData instance of the specified format and set its value based on the given byte[]. Only the following byte[] based formats can be created using this constructor:

Parameters:
bytes - the byte array to set, must not be null
format - the format of the DmtData instance to be created, must be one of the formats specified above
Throws:
java.lang.IllegalArgumentException - if format is not one of the allowed formats
java.lang.NullPointerException - if bytes is null

DmtData

public DmtData(java.lang.String formatName,
               java.lang.String data)
Create a DmtData instance in FORMAT_RAW_STRING format. The data is provided encoded as a String. The actual data format is specified in formatName. The encoding used in data must conform to this format.

Parameters:
formatName - the name of the format, must not be null
data - the data encoded according to the specified format, must not be null
Throws:
java.lang.NullPointerException - if formatName or data is null

DmtData

public DmtData(java.lang.String formatName,
               byte[] data)
Create a DmtData instance in FORMAT_RAW_BINARY format. The data is provided encoded as binary. The actual data format is specified in formatName. The encoding used in data must conform to this format.

Parameters:
formatName - the name of the format, must not be null
data - the data encoded according to the specified format, must not be null
Throws:
java.lang.NullPointerException - if formatName or data is null
Method Detail

getString

public java.lang.String getString()
Gets the value of a node with string (chr) format.

Returns:
the string value
Throws:
DmtIllegalStateException - if the format of the node is not string

getDate

public java.lang.String getDate()
Gets the value of a node with date format. The returned date string is formatted according to the ISO 8601 definition of a calendar date in complete representation, basic format (pattern CCYYMMDD).

Returns:
the date value
Throws:
DmtIllegalStateException - if the format of the node is not date

getTime

public java.lang.String getTime()
Gets the value of a node with time format. The returned time string is formatted according to the ISO 8601 definition of the time of day. The exact format depends on the value the object was initialized with: either local time, complete representation, basic format (pattern hhmmss ) or Coordinated Universal Time, basic format (pattern hhmmssZ).

Returns:
the time value
Throws:
DmtIllegalStateException - if the format of the node is not time

getDateTime

public java.util.Date getDateTime()
Gets the value of a node with dateTime format.

Returns:
the Date value
Throws:
DmtIllegalStateException - if the format of the node is not time
Since:
2.0

getXml

public java.lang.String getXml()
Gets the value of a node with xml format.

Returns:
the XML value
Throws:
DmtIllegalStateException - if the format of the node is not xml

getInt

public int getInt()
Gets the value of a node with integer (int) format.

Returns:
the integer value
Throws:
DmtIllegalStateException - if the format of the node is not integer

getLong

public long getLong()
Gets the value of a node with long format.

Returns:
the long value
Throws:
DmtIllegalStateException - if the format of the node is not long
Since:
2.0

getFloat

public float getFloat()
Gets the value of a node with float format.

Returns:
the float value
Throws:
DmtIllegalStateException - if the format of the node is not float

getBoolean

public boolean getBoolean()
Gets the value of a node with boolean (bool) format.

Returns:
the boolean value
Throws:
DmtIllegalStateException - if the format of the node is not boolean

getBinary

public byte[] getBinary()
Gets the value of a node with binary (bin) format.

Returns:
the binary value
Throws:
DmtIllegalStateException - if the format of the node is not binary

getRawBinary

public byte[] getRawBinary()
Gets the value of a node in raw binary (FORMAT_RAW_BINARY) format.

Returns:
the data value in raw binary format
Throws:
DmtIllegalStateException - if the format of the node is not raw binary

getRawString

public java.lang.String getRawString()
Gets the value of a node in raw String ( FORMAT_RAW_STRING) format.

Returns:
the data value in raw String format
Throws:
DmtIllegalStateException - if the format of the node is not raw String

getBase64

public byte[] getBase64()
Gets the value of a node with base 64 (b64) format.

Returns:
the binary value
Throws:
DmtIllegalStateException - if the format of the node is not base 64.

getNode

public java.lang.Object getNode()
Gets the complex data associated with an interior node (node format).

Certain interior nodes can support access to their subtrees through complex values, making it simpler to retrieve or update all leaf nodes in the subtree.

Returns:
the data object associated with an interior node
Throws:
DmtIllegalStateException - if the format of the data is not node

getFormat

public int getFormat()
Get the node's format, expressed in terms of type constants defined in this class. Note that the 'format' term is a legacy from OMA DM, it is more customary to think of this as 'type'.

Returns:
the format of the node

getFormatName

public java.lang.String getFormatName()
Returns the format of this DmtData as String. For the predefined data formats this is the OMA DM defined name of the format. For FORMAT_RAW_STRING and FORMAT_RAW_BINARY this is the format specified when the object was created.

Returns:
the format name as String

getSize

public int getSize()
Get the size of the data. The returned value depends on the format of data in the node:

Returns:
the size of the data stored by this object

toString

public java.lang.String toString()
Gets the string representation of the DmtData. This method works for all formats.

For string format data - including FORMAT_RAW_STRING - the string value itself is returned, while for XML, date, time, integer, float, boolean, long and node formats the string form of the value is returned. Binary - including FORMAT_RAW_BINARY - base64 data is represented by two-digit hexadecimal numbers for each byte separated by spaces. The NULL_VALUE data has the string form of " null". Data of string or XML format containing the Java null value is represented by an empty string. DateTime data is formatted as yyyy-MM-dd'T'HH:mm:SS'Z').

Overrides:
toString in class java.lang.Object
Returns:
the string representation of this DmtData instance

equals

public boolean equals(java.lang.Object obj)
Compares the specified object with this DmtData instance. Two DmtData objects are considered equal if their format is the same, and their data (selected by the format) is equal.

In case of FORMAT_RAW_BINARY and FORMAT_RAW_STRING the textual name of the data format - as returned by getFormatName() - must be equal as well.

Overrides:
equals in class java.lang.Object
Parameters:
obj - the object to compare with this DmtData
Returns:
true if the argument represents the same DmtData as this object

hashCode

public int hashCode()
Returns the hash code value for this DmtData instance. The hash code is calculated based on the data (selected by the format) of this object.

Overrides:
hashCode in class java.lang.Object
Returns:
the hash code value for this object

Knopflerfish OSGi 5.2.0