RegisterPluginTwiceTest.java revision 17180:e748c6a2d2e6 
1/*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 4836432 8037743
27 * @summary This test attempts to register two instances of one ImageReaderSPI.
28 *          Expected behavior is that only one instance of ImageReaderSPI will
29 *          be registered.
30 */
31
32import java.io.IOException;
33import java.util.Iterator;
34import java.util.Locale;
35
36import javax.imageio.ImageReader;
37import javax.imageio.spi.IIORegistry;
38import javax.imageio.spi.ServiceRegistry;
39import javax.imageio.stream.ImageInputStream;
40
41public class RegisterPluginTwiceTest {
42
43    public RegisterPluginTwiceTest() throws Exception {
44        BMPImageReaderSPI BMPSpi = new BMPImageReaderSPI();
45        BMPImageReaderSPI BMPSpi1 = new BMPImageReaderSPI();
46
47        IIORegistry regis = IIORegistry.getDefaultInstance();
48        boolean res1
49            = regis.registerServiceProvider(BMPSpi,
50                                            javax.imageio.spi.ImageReaderSpi.class);
51        boolean res2
52            = regis.registerServiceProvider(BMPSpi1,
53                                            javax.imageio.spi.ImageReaderSpi.class);
54
55        if(!res1 || res2) {
56            throw new RuntimeException("Bad returned values for registerServiceProvider");
57        }
58        Iterator it = regis.getServiceProviders(Class.forName("javax.imageio.spi.ImageReaderSpi"), true);
59        int count = 0;
60        while (it.hasNext()) {
61            Object o = it.next();
62            if(o instanceof BMPImageReaderSPI) {
63                count++;
64                System.out.println("Found next BMPImageReaderSPI, count = " +count);
65            }
66        }
67        if(count > 1) {
68            throw new RuntimeException("Too many instances of the BMPImageReaderSPI was registered!");
69        }
70    }
71
72    public static void main(String args[]) throws Exception{
73        RegisterPluginTwiceTest fnio = new RegisterPluginTwiceTest();
74    }
75
76
77 /**
78  Not a perfect implementation of SPI. This is just a dummy implementation
79  which denotes some arbitrary reader class. The intention is to check how this
80  is getting registered in the registry. Hence some of the values in this class
81  may be inappropriate..
82 */
83    public static class BMPImageReaderSPI extends javax.imageio.spi.ImageReaderSpi{
84
85        private static final String vendorName = "Javasoft";
86
87        private static final String version = "2.0";
88
89        private static final String[] names = { "bmp" };
90
91        private static final String[] suffixes = { "bmp" };
92
93        private static final String[] MIMETypes = { "image/x-bmp"};
94
95        private static final String readerClassName =
96        "com.sun.imageio.plugins.png.PNGImageReader";
97
98        private static final String[] writerSpiNames = {
99            "com.sun.imageio.plugins.png.PNGImageWriterSpi"
100        };
101
102        public BMPImageReaderSPI() {
103            super(vendorName,
104                  version,
105                  names,
106                  suffixes,
107                  MIMETypes,
108                  readerClassName,
109                  STANDARD_INPUT_TYPE,
110                  writerSpiNames,
111                  false,
112                  null, null,
113                  null, null,
114                  true,
115                  "BMP Native Metadata",
116                  "com.sun.imageio.plugins.png.PNGMetadataFormat",
117                  null, null
118                  );
119        }
120
121        public String getDescription(Locale locale) {
122            return "Standard BMP image reader";
123        }
124
125        public boolean canDecodeInput(Object input) throws IOException {
126            if (!(input instanceof ImageInputStream)) {
127                return false;
128            }
129
130            ImageInputStream stream = (ImageInputStream)input;
131            byte[] b = new byte[8];
132            stream.mark();
133            stream.readFully(b);
134            stream.reset();
135
136            return (b[0] == (byte)137 &&
137                    b[1] == (byte)80 &&
138                    b[2] == (byte)78 &&
139                    b[3] == (byte)71 &&
140                    b[4] == (byte)13 &&
141                    b[5] == (byte)10 &&
142                    b[6] == (byte)26 &&
143                    b[7] == (byte)10);
144        }
145
146        public ImageReader createReaderInstance(Object extension) {
147            //return new PNGImageReader(this);
148            return null;
149        }
150        public void onRegistration(ServiceRegistry sr, Class<?> category) {
151            //System.out.println("Registered "+category);
152            super.onRegistration(sr, category);
153        }
154
155        public void onDeregistration(ServiceRegistry sr, Class<?> category) {
156            //System.out.println("De-Registered "+category);
157            //super.onRegistration(sr, category);
158        }
159    }
160}
161