/*
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * !#
 */

package net.ontopia.net.data;

import java.io.InputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;


/**
 * INTERNAL: This class enables Java to dereference data: URLs, as
 * described in RFC 2397, ftp://sunsite.uio.no/pub/rfc/rfc2397.txt.
 */

public class DataURLConnection extends URLConnection {
  
  private DataURL dataurl = null;
  
  public DataURLConnection(URL url) {
    super(url);
  }

  public int getContentLength() {
    return dataurl.getContentLength();
  }

  public String getContentType() {
    return dataurl.getMediaType();
  }

  public String getContentEncoding() {
    return dataurl.getContentEncoding();
  }

  public InputStream getInputStream() throws IOException {
    return dataurl.getContentsAsStream();
  }

  public String getHeaderField(String name) {
    if (name.equals("Content-type"))
      return getContentType();
    else if (name.equals("Content-length"))
      return Integer.toString(getContentLength());
    else
      return null;
  }
  
  public void connect() throws IOException {
    if (connected) return;
    dataurl = new DataURL(url);
    connected = true;
  }
  
}