Source for gnu.javax.imageio.jpeg.JPEGImageReaderSpi

   1: /* JPEGImageReaderSpi.java --
   2:    Copyright (C)  2006  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: package gnu.javax.imageio.jpeg;
  39: 
  40: import java.io.IOException;
  41: import java.util.Locale;
  42: import javax.imageio.ImageReader;
  43: import javax.imageio.spi.ImageReaderSpi;
  44: import javax.imageio.spi.IIORegistry;
  45: import javax.imageio.stream.ImageInputStream;
  46: 
  47: public class JPEGImageReaderSpi extends ImageReaderSpi
  48: {
  49:   static final String vendorName = "GNU";
  50:   static final String version = "0.1";
  51:   static final String readerClassName =
  52:     "gnu.javax.imageio.jpeg.JPEGImageReader";
  53:   static final String[] names = { "JPEG" };
  54:   static final String[] suffixes = { ".jpeg", ".jpg", ".jpe" };
  55:   static final String[] MIMETypes = { "image/jpeg" };
  56:   static final String[] writerSpiNames =
  57:     { "gnu.javax.imageio.jpeg.JPEGImageWriterSpi" };
  58: 
  59:   static final boolean supportsStandardStreamMetadataFormat = false;
  60:   static final String nativeStreamMetadataFormatName = null;
  61:   static final String nativeStreamMetadataFormatClassName = null;
  62:   static final String[] extraStreamMetadataFormatNames = null;
  63:   static final String[] extraStreamMetadataFormatClassNames = null;
  64:   static final boolean supportsStandardImageMetadataFormat = false;
  65:   static final String nativeImageMetadataFormatName = null;
  66:   static final String nativeImageMetadataFormatClassName = null;
  67:   static final String[] extraImageMetadataFormatNames = null;
  68:   static final String[] extraImageMetadataFormatClassNames = null;
  69: 
  70:   private static JPEGImageReaderSpi readerSpi;
  71: 
  72:   public JPEGImageReaderSpi()
  73:   {
  74:     super(vendorName, version,
  75:           names, suffixes, MIMETypes,
  76:           readerClassName,
  77:           STANDARD_INPUT_TYPE, // Accept ImageInputStreams
  78:           writerSpiNames,
  79:           supportsStandardStreamMetadataFormat,
  80:           nativeStreamMetadataFormatName,
  81:           nativeStreamMetadataFormatClassName,
  82:           extraStreamMetadataFormatNames,
  83:           extraStreamMetadataFormatClassNames,
  84:           supportsStandardImageMetadataFormat,
  85:           nativeImageMetadataFormatName,
  86:           nativeImageMetadataFormatClassName,
  87:           extraImageMetadataFormatNames,
  88:           extraImageMetadataFormatClassNames);
  89:     System.out.println ("JPEGImageReaderSPI!!!");
  90:   }
  91: 
  92:   public String getDescription(Locale locale)
  93:   {
  94:     return "JPEG ISO 10918-1, JFIF V1.02";
  95:   }
  96: 
  97:   public boolean canDecodeInput(Object input)
  98:     throws IOException
  99:   {
 100:     if (!(input instanceof ImageInputStream))
 101:       return false;
 102: 
 103:     ImageInputStream in = (ImageInputStream) input;
 104:     boolean retval;
 105: 
 106:     in.mark();
 107:     try
 108:       {
 109:         new JPEGDecoder(in);
 110:         retval = true;
 111:       }
 112:     catch(JPEGException e)
 113:       {
 114:         retval = false;
 115:       }
 116:     in.reset();
 117: 
 118:     return retval;
 119:   }
 120: 
 121:   public ImageReader createReaderInstance(Object extension)
 122:   {
 123:     return new JPEGImageReader(this);
 124:   }
 125: 
 126:   public static void registerSpis(IIORegistry reg)
 127:   {
 128:     reg.registerServiceProvider(getReaderSpi(), ImageReaderSpi.class);
 129:   }
 130: 
 131:   public static synchronized JPEGImageReaderSpi getReaderSpi()
 132:   {
 133:     if (readerSpi == null)
 134:       readerSpi = new JPEGImageReaderSpi();
 135:     return readerSpi;
 136:   }
 137: }