| /* 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(); |
| } |
| } |