/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.http;

import java.io.InputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;

import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.osgi.service.http.HttpContext;

import org.knopflerfish.service.log.LogRef;


public class ServletContextImpl implements ServletContext {

  // private fields

  private final HttpContext httpContext;
  private final String realPath;
  private final HttpConfig httpConfig;
  private final LogRef log;
  private final Registrations registrations;

  private final Attributes attributes = new Attributes();


  // constructors

  ServletContextImpl(final HttpContext httpContext,
                     final String realPath,
                     final HttpConfig httpConfig,
                     final LogRef log,
                     final Registrations registrations) {

    this.httpContext = httpContext;
    this.realPath = realPath;
    this.httpConfig = httpConfig;
    this.log = log;
    this.registrations = registrations;
  }


  // implements ServletContext

  public ServletContext getContext(final String uri) {
    return null; // NYI: OK
  }

  public int getMajorVersion() {
    return 2;
  }

  public int getMinorVersion() {
    return 1;
  }

  public String getMimeType(final String file) {

    String mimeType = httpContext.getMimeType(file);

    if (mimeType == null)
      mimeType = httpConfig.getMimeType(file);

    return mimeType;
  }

  public URL getResource(final String path) {
    return httpContext.getResource(realPath + path);
  }

  public InputStream getResourceAsStream(final String path) {

    final URL url = getResource(path);
    if (url == null)
      return null;
    else {
      try {
        return url.openStream();
      } catch (IOException ioe) {
        return null;
      }
    }
  }

  public RequestDispatcher getRequestDispatcher(final String uri) {
    return registrations.getRequestDispatcher(uri);
  }

  public RequestDispatcher getNamedDispatcher(final String name) {
    return null; // NYI: OK, but could be implemented
  }

  public Servlet getServlet(final String name) throws ServletException {
    return null; // deprecated
  }

  public Enumeration getServlets() {
    return HttpUtil.EMPTY_ENUMERATION; // deprecated
  }

  public Enumeration getServletNames() {
    return HttpUtil.EMPTY_ENUMERATION; // deprecated
  }

  public void log(final String message) {
    if (log.doInfo()) log.info(message);
  }

  public void log(final Exception exception, final String message) {
    log(message, exception); // deprecated
  }

  public void log(final String message, final Throwable throwable) {
    if (log.doWarn()) log.warn(message, throwable);
  }

  public String getRealPath(final String path) {
    return null;
  }

  public String getServerInfo() {
    return httpConfig.getServerInfo();
  }

  public String getInitParameter(final String name) {
    return null; // NYI: OK
  }

  public Enumeration getInitParameterNames() {
    return HttpUtil.EMPTY_ENUMERATION; // NYI: OK
  }

  public Object getAttribute(final String name) {
    return attributes.getAttribute(name);
  }

  public Enumeration getAttributeNames() {
    return attributes.getAttributeNames();
  }

  public void setAttribute(final String name, final Object value) {
    attributes.setAttribute(name, value);
  }

  public void removeAttribute(final String name) {
    attributes.removeAttribute(name);
  }

} // ServletContextImpl