/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 CAUCHO TECHNOLOGY OR ITS 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.
 *
 * @author Scott Ferguson
 */

package com.caucho.hessian4.client;

import java.net.URL;
import java.net.URLConnection;
import java.net.HttpURLConnection;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.FileNotFoundException;

/**
 * Internal connection to a server.  The default connection is based on
 * java.net
 */
public class HessianURLConnection extends AbstractHessianConnection {
  private URL _url;
  private URLConnection _conn;

  private int _statusCode;
  private String _statusMessage;

  private InputStream _inputStream;
  private InputStream _errorStream;

  HessianURLConnection(URL url, URLConnection conn)
  {
    _url = url;
    _conn = conn;
  }

  /**
   * Adds a HTTP header.
   */
  @Override
  public void addHeader(String key, String value)
  {
    _conn.setRequestProperty(key, value);
  }
  
  /**
   * Returns the output stream for the request.
   */
  public OutputStream getOutputStream()
    throws IOException
  {
    return _conn.getOutputStream();
  }

  /**
   * Sends the request
   */
  public void sendRequest()
    throws IOException
  {
    if (_conn instanceof HttpURLConnection) {
      HttpURLConnection httpConn = (HttpURLConnection) _conn;
      
      _statusCode = 500;

      try {
        _statusCode = httpConn.getResponseCode();
      } catch (Exception e) {
      }

      parseResponseHeaders(httpConn);

      InputStream is = null;

      if (_statusCode != 200) {
        StringBuffer sb = new StringBuffer();
        int ch;

        try {
          is = httpConn.getInputStream();

          if (is != null) {
            while ((ch = is.read()) >= 0)
              sb.append((char) ch);

            is.close();
          }

          is = httpConn.getErrorStream();
          if (is != null) {
            while ((ch = is.read()) >= 0)
              sb.append((char) ch);
          }

          _statusMessage = sb.toString();
        } catch (FileNotFoundException e) {
          throw new HessianConnectionException("HessianProxy cannot connect to '" + _url, e);
        } catch (IOException e) {
          if (is == null)
            throw new HessianConnectionException(_statusCode + ": " + e, e);
          else
            throw new HessianConnectionException(_statusCode + ": " + sb, e);
        }

        if (is != null)
          is.close();

        throw new HessianConnectionException(_statusCode + ": " + sb.toString());
      }
    }
  }

  protected void parseResponseHeaders(HttpURLConnection conn)
    throws IOException
  {
  }

  /**
   * Returns the status code.
   */
  public int getStatusCode()
  {
    return _statusCode;
  }

  /**
   * Returns the status string.
   */
  public String getStatusMessage()
  {
    return _statusMessage;
  }

  /**
   * Returns the InputStream to the result
   */
  @Override
  public InputStream getInputStream()
    throws IOException
  {
    return _conn.getInputStream(); 
  }
  
  @Override
  public String getContentEncoding()
  {
    return _conn.getContentEncoding();
  }

  /**
   * Close/free the connection
   */
  @Override
  public void close()
  {
    _inputStream = null;
  }

  /**
   * Disconnect the connection
   */
  @Override
  public void destroy()
  {
    close();
    
    URLConnection conn = _conn;
    _conn = null;
    
    if (conn instanceof HttpURLConnection)
      ((HttpURLConnection) conn).disconnect();
  }
}

