Source for javax.imageio.spi.ImageReaderSpi

   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: 
  57:   protected ImageReaderSpi()
  58:   {
  59:     // Do nothing here.
  60:   }
  61: 
  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: 
  92:   public abstract boolean canDecodeInput(Object source)
  93:     throws IOException;
  94: 
  95:   public ImageReader createReaderInstance()
  96:     throws IOException
  97:   {
  98:     return createReaderInstance(null);
  99:   }
 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: }