Package com.sun.media.imageioimpl.stream

Source Code of com.sun.media.imageioimpl.stream.ChannelImageInputStreamSpi

/*
* $RCSfile: ChannelImageInputStreamSpi.java,v $
*
*
* Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
*   notice, this  list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in
*   the documentation and/or other materials provided with the
*   distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 05:01:53 $
* $State: Exp $
*/
package com.sun.media.imageioimpl.stream;

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.util.Locale;
import javax.imageio.spi.ImageInputStreamSpi;
import javax.imageio.stream.FileCacheImageInputStream;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import com.sun.media.imageio.stream.FileChannelImageInputStream;
import com.sun.media.imageioimpl.common.PackageUtil;

public class ChannelImageInputStreamSpi extends ImageInputStreamSpi {
    public ChannelImageInputStreamSpi() {
        super(PackageUtil.getVendor(),
              PackageUtil.getVersion(),
        ReadableByteChannel.class);
    }

    public ImageInputStream createInputStreamInstance(Object input,
                  boolean useCache,
                  File cacheDir)
  throws IOException {

  if(input == null ||
     !(input instanceof ReadableByteChannel)) {
      throw new IllegalArgumentException("XXX");
  }

  ImageInputStream stream = null;

  if(input instanceof FileChannel) {
      stream = new FileChannelImageInputStream((FileChannel)input);
  } else {
      InputStream inStream =
    Channels.newInputStream((ReadableByteChannel)input);

      if(useCache) {
    try {
        stream = new FileCacheImageInputStream(inStream,
                 cacheDir);
    } catch(IOException e) {
        // Cache file could not be created.
    }
      }

      if(stream == null) {
    stream = new MemoryCacheImageInputStream(inStream);
      }
  }

  return stream;
    }

    public String getDescription(Locale locale) {
  return "NIO Channel ImageInputStream";
    }
}
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