001    /* ImageWriterSpi.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.awt.image.RenderedImage;
042    import java.io.IOException;
043    
044    import javax.imageio.ImageTypeSpecifier;
045    import javax.imageio.ImageWriter;
046    import javax.imageio.stream.ImageOutputStream;
047    
048    /**
049     * @author Michael Koch (konqueror@gmx.de)
050     */
051    public abstract class ImageWriterSpi extends ImageReaderWriterSpi
052    {
053      public static final Class[] STANDARD_OUTPUT_TYPE =
054        { ImageOutputStream.class };
055    
056      protected Class[] outputTypes;
057      protected String[] readerSpiNames;
058    
059      protected ImageWriterSpi()
060      {
061        // Do nothing here.
062      }
063    
064      public ImageWriterSpi(String vendorName, String version, String[] names,
065                            String[] suffixes, String[] MIMETypes,
066                            String writerClassName, Class[] outputTypes,
067                            String[] readerSpiNames,
068                            boolean supportsStandardStreamMetadataFormat,
069                            String nativeStreamMetadataFormatName,
070                            String nativeStreamMetadataFormatClassName,
071                            String[] extraStreamMetadataFormatNames,
072                            String[] extraStreamMetadataFormatClassNames,
073                            boolean supportsStandardImageMetadataFormat,
074                            String nativeImageMetadataFormatName,
075                            String nativeImageMetadataFormatClassName,
076                            String[] extraImageMetadataFormatNames,
077                            String[] extraImageMetadataFormatClassNames)
078      {
079        super(vendorName, version, names, suffixes, MIMETypes, writerClassName,
080              supportsStandardStreamMetadataFormat, nativeStreamMetadataFormatName,
081              nativeStreamMetadataFormatClassName, extraStreamMetadataFormatNames,
082              extraStreamMetadataFormatClassNames, supportsStandardImageMetadataFormat,
083              nativeImageMetadataFormatName, nativeImageMetadataFormatClassName,
084              extraImageMetadataFormatNames, extraImageMetadataFormatClassNames);
085    
086        if (writerClassName == null)
087          throw new IllegalArgumentException("writerClassName is null");
088    
089        if (outputTypes == null
090            || outputTypes.length == 0)
091          throw new IllegalArgumentException("outputTypes may not be null or empty");
092    
093        this.outputTypes = outputTypes;
094        this.readerSpiNames = readerSpiNames;
095      }
096    
097      public abstract boolean canEncodeImage(ImageTypeSpecifier type);
098    
099      public boolean canEncodeImage(RenderedImage image)
100      {
101        return canEncodeImage (new ImageTypeSpecifier(image));
102      }
103    
104      public ImageWriter createWriterInstance()
105        throws IOException
106      {
107        return createWriterInstance(null);
108      }
109    
110      public abstract ImageWriter createWriterInstance(Object extension)
111        throws IOException;
112    
113      public String[] getImageReaderSpiNames()
114      {
115        return readerSpiNames;
116      }
117    
118      public Class[] getOutputTypes()
119      {
120        return outputTypes;
121      }
122    
123      public boolean isFormatLossless()
124      {
125        return true;
126      }
127    
128      public boolean isOwnWriter(ImageWriter writer)
129      {
130        if (writer == null)
131          throw new IllegalArgumentException("writer may not be null");
132    
133        return pluginClassName.equals(writer.getClass().getName());
134      }
135    }