FileWithHeadersURLConnection.java

/*
    GNU GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    verion 2 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Jun 12, 2005
 */
package org.lobobrowser.request;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.lobobrowser.util.NameValuePair;
import org.lobobrowser.util.io.IORoutines;

/**
 * @author J. H. S.
 */
public class FileWithHeadersURLConnection extends HttpURLConnection {
  private final byte[] content;
  private InputStream inputStream;
  private final Map<String, List<String>> headersMap = new HashMap<>();
  private final List<NameValuePair> headersList = new ArrayList<>();

  /**
   * @param url
   */
  public FileWithHeadersURLConnection(final URL url, final byte[] content) {
    super(url);
    this.content = content;
  }

  @Override
  public void disconnect() {
    if (this.connected) {
      final InputStream in = this.inputStream;
      if (in != null) {
        try {
          in.close();
        } catch (final IOException ioe) {
          // ignore
        }
      }
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#connect()
   */
  @Override
  public void connect() throws IOException {
    if (!this.connected) {
      final InputStream in = new ByteArrayInputStream(this.content);
      try {
        this.inputStream = in;
        readHeaders(in);
      } finally {
        // Do not close inputStream. Needed later.
        this.connected = true;
        this.responseCode = 200;
      }
    }
  }

  private void readHeaders(final InputStream in) throws IOException {
    String line;
    final List<NameValuePair> headersList = this.headersList;
    final Map<String, List<String>> headersMap = this.headersMap;
    while ((line = IORoutines.readLine(in)) != null) {
      if ("".equals(line)) {
        break;
      }
      final int colonIdx = line.indexOf(':');
      final String name = colonIdx == -1 ? "" : line.substring(0, colonIdx).trim().toLowerCase();
      final String value = colonIdx == -1 ? line.trim() : line.substring(colonIdx + 1).trim();
      List<String> hvalues = headersMap.get(name);
      if (hvalues == null) {
        hvalues = new ArrayList<>(1);
        headersMap.put(name, hvalues);
      }
      hvalues.add(value);
      headersList.add(new NameValuePair(name, value));
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#getInputStream()
   */
  @Override
  public InputStream getInputStream() throws IOException {
    this.connect();
    return this.inputStream;
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#getHeaderField(int)
   */
  @Override
  public String getHeaderField(final int n) {
    try {
      this.connect();
      final NameValuePair pair = this.headersList.get(n);
      return pair.value;
    } catch (final IndexOutOfBoundsException iob) {
      return null;
    } catch (final IOException ioe) {
      return null;
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#getHeaderField(java.lang.String)
   */
  @Override
  public String getHeaderField(final String name) {
    try {
      this.connect();
    } catch (final IOException ioe) {
      return null;
    }
    final List<String> hvalues = this.headersMap.get(name.toLowerCase());
    if ((hvalues == null) || (hvalues.size() == 0)) {
      return null;
    }
    return hvalues.get(0);
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#getHeaderFieldKey(int)
   */
  @Override
  public String getHeaderFieldKey(final int n) {
    try {
      this.connect();
      final NameValuePair pair = this.headersList.get(n);
      return pair.name;
    } catch (final IndexOutOfBoundsException iob) {
      return null;
    } catch (final IOException ioe) {
      return null;
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see java.net.URLConnection#getHeaderFields()
   */
  @Override
  public Map<String, List<String>> getHeaderFields() {
    try {
      this.connect();
    } catch (final IOException ioe) {
      return null;
    }
    return this.headersMap;
  }

  @Override
  public boolean usingProxy() {
    return false;
  }
}