1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17/**
18 * @author Rustem V. Rafikov
19 * @version $Revision: 1.3 $
20 */
21
22package javax.imageio.spi;
23
24import java.util.Arrays;
25
26import org.apache.harmony.x.imageio.plugins.jpeg.JPEGImageReaderSpi;
27import org.apache.harmony.x.imageio.plugins.jpeg.JPEGImageWriterSpi;
28import org.apache.harmony.x.imageio.plugins.png.PNGImageReaderSpi;
29import org.apache.harmony.x.imageio.plugins.png.PNGImageWriterSpi;
30import org.apache.harmony.x.imageio.spi.FileIISSpi;
31import org.apache.harmony.x.imageio.spi.FileIOSSpi;
32import org.apache.harmony.x.imageio.spi.InputStreamIISSpi;
33import org.apache.harmony.x.imageio.spi.OutputStreamIOSSpi;
34import org.apache.harmony.x.imageio.spi.RAFIISSpi;
35import org.apache.harmony.x.imageio.spi.RAFIOSSpi;
36
37/*
38 * @author Rustem V. Rafikov, Viskov Nikolay
39 * @version $Revision: 1.3 $
40 */
41
42/**
43 * The IIORegistry class registers service provider instances (SPI). Service
44 * provider instances are recognized by specific meta-information in the JAR
45 * files containing them. The JAR files with SPI classes are loaded from the
46 * application class path.
47 *
48 * @since Android 1.0
49 */
50public final class IIORegistry extends ServiceRegistry {
51
52    /**
53     * The instance.
54     */
55    private static IIORegistry instance;
56
57    /**
58     * The Constant CATEGORIES.
59     */
60    private static final Class[] CATEGORIES = new Class[] {
61            javax.imageio.spi.ImageWriterSpi.class, javax.imageio.spi.ImageReaderSpi.class,
62            javax.imageio.spi.ImageInputStreamSpi.class,
63            // javax.imageio.spi.ImageTranscoderSpi.class,
64            javax.imageio.spi.ImageOutputStreamSpi.class
65    };
66
67    /**
68     * Instantiates a new IIO registry.
69     */
70    private IIORegistry() {
71        super(Arrays.<Class<?>> asList(CATEGORIES).iterator());
72        registerBuiltinSpis();
73        registerApplicationClasspathSpis();
74    }
75
76    /**
77     * Register built-in SPIs.
78     */
79    private void registerBuiltinSpis() {
80        registerServiceProvider(new JPEGImageWriterSpi());
81        registerServiceProvider(new JPEGImageReaderSpi());
82        registerServiceProvider(new PNGImageReaderSpi());
83        registerServiceProvider(new PNGImageWriterSpi());
84        registerServiceProvider(new FileIOSSpi());
85        registerServiceProvider(new FileIISSpi());
86        registerServiceProvider(new RAFIOSSpi());
87        registerServiceProvider(new RAFIISSpi());
88        registerServiceProvider(new OutputStreamIOSSpi());
89        registerServiceProvider(new InputStreamIISSpi());
90        // -- TODO implement
91    }
92
93    /**
94     * Gets the default IIORegistry instance.
95     *
96     * @return the default IIORegistry instance.
97     */
98    public static IIORegistry getDefaultInstance() {
99        // TODO implement own instance for each ThreadGroup (see also
100        // ThreadLocal)
101        synchronized (IIORegistry.class) {
102            if (instance == null) {
103                instance = new IIORegistry();
104            }
105            return instance;
106        }
107    }
108
109    /**
110     * Registers all service providers from the application class path.
111     */
112    public void registerApplicationClasspathSpis() {
113        // -- TODO implement for non-builtin plugins
114    }
115}
116