001 /* IIORegistry.java --
002 Copyright (C) 2004 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.imageio.spi;
040
041 import gnu.classpath.ServiceFactory;
042
043 import java.awt.Toolkit;
044 import java.util.HashMap;
045 import java.util.HashSet;
046 import java.util.Iterator;
047
048 import gnu.java.awt.ClasspathToolkit;
049 import gnu.javax.imageio.bmp.BMPImageReaderSpi;
050 import gnu.javax.imageio.bmp.BMPImageWriterSpi;
051 import gnu.javax.imageio.gif.GIFImageReaderSpi;
052 import gnu.javax.imageio.png.PNGImageReaderSpi;
053
054 public 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 }