Source for javax.imageio.spi.ImageWriterSpi

   1: /* ImageWriterSpi.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.awt.image.RenderedImage;
  42: import java.io.IOException;
  43: 
  44: import javax.imageio.ImageTypeSpecifier;
  45: import javax.imageio.ImageWriter;
  46: import javax.imageio.stream.ImageOutputStream;
  47: 
  48: /**
  49:  * @author Michael Koch (konqueror@gmx.de)
  50:  */
  51: public abstract class ImageWriterSpi extends ImageReaderWriterSpi
  52: {
  53:   public static final Class[] STANDARD_OUTPUT_TYPE =
  54:     { ImageOutputStream.class };
  55: 
  56:   protected Class[] outputTypes;
  57:   protected String[] readerSpiNames;
  58: 
  59:   protected ImageWriterSpi()
  60:   {
  61:     // Do nothing here.
  62:   }
  63: 
  64:   public ImageWriterSpi(String vendorName, String version, String[] names,
  65:                         String[] suffixes, String[] MIMETypes,
  66:                         String writerClassName, Class[] outputTypes,
  67:                         String[] readerSpiNames,
  68:                         boolean supportsStandardStreamMetadataFormat,
  69:                         String nativeStreamMetadataFormatName,
  70:                         String nativeStreamMetadataFormatClassName,
  71:                         String[] extraStreamMetadataFormatNames,
  72:                         String[] extraStreamMetadataFormatClassNames,
  73:                         boolean supportsStandardImageMetadataFormat,
  74:                         String nativeImageMetadataFormatName,
  75:                         String nativeImageMetadataFormatClassName,
  76:                         String[] extraImageMetadataFormatNames,
  77:                         String[] extraImageMetadataFormatClassNames)
  78:   {
  79:     super(vendorName, version, names, suffixes, MIMETypes, writerClassName,
  80:           supportsStandardStreamMetadataFormat, nativeStreamMetadataFormatName,
  81:           nativeStreamMetadataFormatClassName, extraStreamMetadataFormatNames,
  82:           extraStreamMetadataFormatClassNames, supportsStandardImageMetadataFormat,
  83:           nativeImageMetadataFormatName, nativeImageMetadataFormatClassName,
  84:           extraImageMetadataFormatNames, extraImageMetadataFormatClassNames);
  85: 
  86:     if (writerClassName == null)
  87:       throw new IllegalArgumentException("writerClassName is null");
  88: 
  89:     if (outputTypes == null
  90:         || outputTypes.length == 0)
  91:       throw new IllegalArgumentException("outputTypes may not be null or empty");
  92:     
  93:     this.outputTypes = outputTypes;
  94:     this.readerSpiNames = readerSpiNames;    
  95:   }
  96: 
  97:   public abstract boolean canEncodeImage(ImageTypeSpecifier type);
  98: 
  99:   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: }