1 /* ImageReaderSpi.java --
2    Copyright (C) 2004  Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 
39 package javax.imageio.spi;
40 
41 import java.io.IOException;
42 
43 import javax.imageio.ImageReader;
44 import javax.imageio.stream.ImageInputStream;
45 
46 /**
47  * @author Michael Koch (konqueror@gmx.de)
48  */
49 public abstract class ImageReaderSpi extends ImageReaderWriterSpi
50 {
51   public static final Class[] STANDARD_INPUT_TYPE =
52     { ImageInputStream.class };
53 
54   protected Class[] inputTypes;
55   protected String[] writerSpiNames;
56 
ImageReaderSpi()57   protected ImageReaderSpi()
58   {
59     // Do nothing here.
60   }
61 
ImageReaderSpi(String vendorName, String version, String[] names, String[] suffixes, String[] MIMETypes, String readerClassName, Class[] inputTypes, String[] writerSpiNames, boolean supportsStandardStreamMetadataFormat, String nativeStreamMetadataFormatName, String nativeStreamMetadataFormatClassName, String[] extraStreamMetadataFormatNames, String[] extraStreamMetadataFormatClassNames, boolean supportsStandardImageMetadataFormat, String nativeImageMetadataFormatName, String nativeImageMetadataFormatClassName, String[] extraImageMetadataFormatNames, String[] extraImageMetadataFormatClassNames)62   public ImageReaderSpi(String vendorName, String version, String[] names,
63                         String[] suffixes, String[] MIMETypes,
64                         String readerClassName, Class[] inputTypes,
65                         String[] writerSpiNames,
66                         boolean supportsStandardStreamMetadataFormat,
67                         String nativeStreamMetadataFormatName,
68                         String nativeStreamMetadataFormatClassName,
69                         String[] extraStreamMetadataFormatNames,
70                         String[] extraStreamMetadataFormatClassNames,
71                         boolean supportsStandardImageMetadataFormat,
72                         String nativeImageMetadataFormatName,
73                         String nativeImageMetadataFormatClassName,
74                         String[] extraImageMetadataFormatNames,
75                         String[] extraImageMetadataFormatClassNames)
76   {
77     super(vendorName, version, names, suffixes, MIMETypes, readerClassName,
78           supportsStandardStreamMetadataFormat, nativeStreamMetadataFormatName,
79           nativeStreamMetadataFormatClassName, extraStreamMetadataFormatNames,
80           extraStreamMetadataFormatClassNames, supportsStandardImageMetadataFormat,
81           nativeImageMetadataFormatName, nativeImageMetadataFormatClassName,
82           extraImageMetadataFormatNames, extraImageMetadataFormatClassNames);
83 
84     if (inputTypes == null
85         || inputTypes.length == 0)
86       throw new IllegalArgumentException("inputTypes may not be null or empty");
87 
88     this.inputTypes = inputTypes;
89     this.writerSpiNames = writerSpiNames;
90   }
91 
canDecodeInput(Object source)92   public abstract boolean canDecodeInput(Object source)
93     throws IOException;
94 
createReaderInstance()95   public ImageReader createReaderInstance()
96     throws IOException
97   {
98     return createReaderInstance(null);
99   }
100 
createReaderInstance(Object extension)101   public abstract ImageReader createReaderInstance(Object extension)
102     throws IOException;
103 
getImageWriterSpiNames()104   public String[] getImageWriterSpiNames()
105   {
106     return writerSpiNames;
107   }
108 
getInputTypes()109   public Class[] getInputTypes()
110   {
111     return inputTypes;
112   }
113 
isOwnReader(ImageReader reader)114   public boolean isOwnReader(ImageReader reader)
115   {
116     if (reader == null)
117       throw new IllegalArgumentException("reader may not be null");
118 
119     return pluginClassName.equals(reader.getClass().getName());
120   }
121 }
122