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/* gnu.java.beans.DummyAppletContext

   Copyright (C) 2004, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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 version 2, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.beans;

import java.applet.Applet;

import java.applet.AppletContext;

import java.applet.AudioClip;

import java.awt.Image;

import java.awt.Toolkit;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Collections;

import java.util.Enumeration;

import java.util.Iterator;

/** A placeholder <code>AppletContext</code> implementation that does nothing.

 *

 * <p>This is the default implementation for GNU Classpath and is used for <code>Applet</code>

 * beans being created with {@link java.beans.Beans.instantiate}.</p>

 *

 * <p>It has no functionality in order to allow it to be used without any dependencies

 * (e.g. sound, network access, ...).</p>

 *

 * @author Robert Schuster

 */

class DummyAppletContext implements AppletContext

{

  private static final Enumeration EMPTY_ENUMERATION = Collections.enumeration(Collections.EMPTY_SET);

  DummyAppletContext()

  {

  }

  /** Implementation is VM neutral and returns a dummy {@link AudioClip} instance

   * for every URL that returns a non-<code>null</code> object on

   * <code>URL.openConnection()</code>.

   *

   * @see java.applet.AppletContext#getAudioClip(java.net.URL)

   *

   * FIXME: When Java Sound API (javax.sound) is included in Classpath or URL is able to handle

   * sampled sound this should be adjusted.

   */

  public AudioClip getAudioClip(URL url)

  {

    return Applet.newAudioClip(url);

  }

  /** Loads the <code>Image</code> instance by delegating to

   * {@link java.awt.Toolkit.createImage(URL) }.

   *

   * @see java.applet.AppletContext#getImage(java.net.URL)

   * @see java.awt.Toolkit#createImage(java.net.URL)

   */

  public Image getImage(URL url)

  {

    return Toolkit.getDefaultToolkit().createImage(url);

  }

  /** Returns <code>null</code> for every argument.

   *

   * @see java.applet.AppletContext#getApplet(java.lang.String)

   */

  public Applet getApplet(String name)

  {

    return null;

  }

  /** Returns always an empty <code>Enumeration</code>.

   *

   * @see java.applet.AppletContext#getApplets()

   */

  public Enumeration getApplets()

  {

    return EMPTY_ENUMERATION;

  }

  /** Does nothing.

   *

   * @see java.applet.AppletContext#showDocument(java.net.URL)

   */

  public void showDocument(URL url)

  {

  }

  /** Does nothing.

   *

   * @see java.applet.AppletContext#showDocument(java.net.URL, java.lang.String)

   */

  public void showDocument(URL url, String target)

  {

  }

  /** Does nothing.

   *

   * @see java.applet.AppletContext#showStatus(java.lang.String)

   */

  public void showStatus(String message)

  {

  }

  /** Does nothing.

   *

   * @see java.applet.AppletContext#setStream(java.lang.String, java.io.InputStream)

   */

  public void setStream(String key, InputStream stream)

    throws IOException

  {

    throw new IOException("Dummy implementation imposes zero InputStream associations.");

  }

  /** Returns <code>null</code> for every argument.

   *

   * @see java.applet.AppletContext#getStream(java.lang.String)

   */

  public InputStream getStream(String key)

  {

    return null;

  }

  /** Returns always an empty iterator.

   *

   * @see java.applet.AppletContext#getStreamKeys()

   */

  public Iterator getStreamKeys()

  {

    return Collections.EMPTY_SET.iterator();

  }

}