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}