001    /* ImageReaderSpi.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 java.io.IOException;
042    
043    import javax.imageio.ImageReader;
044    import javax.imageio.stream.ImageInputStream;
045    
046    /**
047     * @author Michael Koch (konqueror@gmx.de)
048     */
049    public abstract class ImageReaderSpi extends ImageReaderWriterSpi
050    {
051      public static final Class[] STANDARD_INPUT_TYPE =
052        { ImageInputStream.class };
053    
054      protected Class[] inputTypes;
055      protected String[] writerSpiNames;
056    
057      protected ImageReaderSpi()
058      {
059        // Do nothing here.
060      }
061    
062      public ImageReaderSpi(String vendorName, String version, String[] names,
063                            String[] suffixes, String[] MIMETypes,
064                            String readerClassName, Class[] inputTypes,
065                            String[] writerSpiNames,
066                            boolean supportsStandardStreamMetadataFormat,
067                            String nativeStreamMetadataFormatName,
068                            String nativeStreamMetadataFormatClassName,
069                            String[] extraStreamMetadataFormatNames,
070                            String[] extraStreamMetadataFormatClassNames,
071                            boolean supportsStandardImageMetadataFormat,
072                            String nativeImageMetadataFormatName,
073                            String nativeImageMetadataFormatClassName,
074                            String[] extraImageMetadataFormatNames,
075                            String[] extraImageMetadataFormatClassNames)
076      {
077        super(vendorName, version, names, suffixes, MIMETypes, readerClassName,
078              supportsStandardStreamMetadataFormat, nativeStreamMetadataFormatName,
079              nativeStreamMetadataFormatClassName, extraStreamMetadataFormatNames,
080              extraStreamMetadataFormatClassNames, supportsStandardImageMetadataFormat,
081              nativeImageMetadataFormatName, nativeImageMetadataFormatClassName,
082              extraImageMetadataFormatNames, extraImageMetadataFormatClassNames);
083    
084        if (inputTypes == null
085            || inputTypes.length == 0)
086          throw new IllegalArgumentException("inputTypes may not be null or empty");
087        
088        this.inputTypes = inputTypes;
089        this.writerSpiNames = writerSpiNames;
090      }
091    
092      public abstract boolean canDecodeInput(Object source)
093        throws IOException;
094    
095      public ImageReader createReaderInstance()
096        throws IOException
097      {
098        return createReaderInstance(null);
099      }
100    
101      public abstract ImageReader createReaderInstance(Object extension)
102        throws IOException;
103    
104      public String[] getImageWriterSpiNames()
105      {
106        return writerSpiNames;
107      }
108    
109      public Class[] getInputTypes()
110      {
111        return inputTypes;
112      }
113    
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    }