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 }