001/* IIORegistry.java --
002   Copyright (C) 2004  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.imageio.spi;
040
041import gnu.classpath.ServiceFactory;
042
043import java.awt.Toolkit;
044import java.util.HashMap;
045import java.util.HashSet;
046import java.util.Iterator;
047
048import gnu.java.awt.ClasspathToolkit;
049import gnu.javax.imageio.bmp.BMPImageReaderSpi;
050import gnu.javax.imageio.bmp.BMPImageWriterSpi;
051import gnu.javax.imageio.gif.GIFImageReaderSpi;
052import gnu.javax.imageio.png.PNGImageReaderSpi;
053
054public final class IIORegistry extends ServiceRegistry
055{
056  private static final HashSet defaultCategories = new HashSet();
057
058  private static HashMap instances = new HashMap();
059
060  static
061  {
062    defaultCategories.add(ImageReaderSpi.class);
063    defaultCategories.add(ImageWriterSpi.class);
064    defaultCategories.add(ImageTranscoderSpi.class);
065    defaultCategories.add(ImageInputStreamSpi.class);
066    defaultCategories.add(ImageOutputStreamSpi.class);
067  }
068
069  public static synchronized IIORegistry getDefaultInstance()
070  {
071    // XXX: This leaks memory if a ThreadGroup isn't available anymore.
072    ThreadGroup group = Thread.currentThread().getThreadGroup();
073    IIORegistry registry = (IIORegistry) instances.get(group);
074
075    if (registry == null)
076      {
077        registry = new IIORegistry();
078        instances.put(group, registry);
079      }
080
081    return registry;
082  }
083
084  private IIORegistry()
085  {
086    super(defaultCategories.iterator());
087
088    // XXX: Register built-in Spis here.
089    registerServiceProvider(new PNGImageReaderSpi()); // Register PNG decoder.
090    registerServiceProvider(new GIFImageReaderSpi()); // Register GIF decoder.
091    registerServiceProvider(new BMPImageReaderSpi());
092    registerServiceProvider(new BMPImageWriterSpi());
093
094    Toolkit toolkit = Toolkit.getDefaultToolkit();
095    if (toolkit instanceof ClasspathToolkit)
096      ((ClasspathToolkit)toolkit).registerImageIOSpis(this);
097
098    registerApplicationClasspathSpis();
099  }
100
101  /**
102   * Registers all available service providers found on the application
103   * classpath.
104   */
105  public void registerApplicationClasspathSpis()
106  {
107    ClassLoader loader = Thread.currentThread().getContextClassLoader();
108    Iterator categories = getCategories();
109
110    while (categories.hasNext())
111      {
112        Class category = (Class) categories.next();
113        Iterator providers = ServiceFactory.lookupProviders(category, loader);
114
115        while (providers.hasNext())
116          registerServiceProvider((IIOServiceProvider) providers.next());
117      }
118  }
119}