001/* ImageReaderSpi.java --
002   Copyright (C) 2004  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.imageio.spi;
040
041import java.io.IOException;
042
043import javax.imageio.ImageReader;
044import javax.imageio.stream.ImageInputStream;
045
046/**
047 * @author Michael Koch (konqueror@gmx.de)
048 */
049public 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}