content: /*
   * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package java.net;
  
  import java.io.IOException;
  
  /**
   * The abstract class {@code ContentHandler} is the superclass
   * of all classes that read an {@code Object} from a
   * {@code URLConnection}.
   * <p>
   * An application does not generally call the
   * {@code getContent} method in this class directly. Instead, an
   * application calls the {@code getContent} method in class
   * {@code URL} or in {@code URLConnection}.
   * The application's content handler factory (an instance of a class that
   * implements the interface {@code ContentHandlerFactory} set
   * up by a call to {@code setContentHandler}) is
   * called with a {@code String} giving the MIME type of the
   * object being received on the socket. The factory returns an
   * instance of a subclass of {@code ContentHandler}, and its
   * {@code getContent} method is called to create the object.
   * <p>
   * If no content handler could be found, URLConnection will
   * look for a content handler in a user-defineable set of places.
   * By default it looks in sun.net.www.content, but users can define a
   * vertical-bar delimited set of class prefixes to search through in
   * addition by defining the java.content.handler.pkgs property.
   * The class name must be of the form:
   * <pre>
   *     {package-prefix}.{major}.{minor}
   * e.g.
   *     YoyoDyne.experimental.text.plain
   * </pre>
   * If the loading of the content handler class would be performed by
   * a classloader that is outside of the delegation chain of the caller,
   * the JVM will need the RuntimePermission "getClassLoader".
   *
   * @author  James Gosling
   * @see     ContentHandler#getContent(URLConnection)
   * @see     ContentHandlerFactory
   * @see     URL#getContent()
   * @see     URLConnection
   * @see     URLConnection#getContent()
   * @see     URLConnection#setContentHandlerFactory(ContentHandlerFactory)
   * @since   JDK1.0
   */
  abstract public class ContentHandler {
      /**
       * Given a URL connect stream positioned at the beginning of the
       * representation of an object, this method reads that stream and
       * creates an object from it.
       *
       * @param      urlc   a URL connection.
       * @return     the object read by the {@code ContentHandler}.
       * @exception  IOException  if an I/O error occurs while reading the object.
       */
      abstract public Object getContent(URLConnection urlc) throws IOException;
  
      /**
       * Given a URL connect stream positioned at the beginning of the
       * representation of an object, this method reads that stream and
       * creates an object that matches one of the types specified.
       *
       * The default implementation of this method should call getContent()
       * and screen the return type for a match of the suggested types.
       *
       * @param      urlc   a URL connection.
       * @param      classes      an array of types requested
       * @return     the object read by the {@code ContentHandler} that is
       *                 the first match of the suggested types.
       *                 null if none of the requested  are supported.
       * @exception  IOException  if an I/O error occurs while reading the object.
       * @since 1.3
       */
      @SuppressWarnings("rawtypes")
      public Object getContent(URLConnection urlc, Class[] classes) throws IOException {
          Object obj = getContent(urlc);
  
          for (int i = 0; i < classes.length; i++) {
            if (classes[i].isInstance(obj)) {
                  return obj;
            }
          }
          return null;
      }
  
  }
  