001/* FileCacheImageInputStream.java --
002   Copyright (C) 2004  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.imageio.stream;
040
041import java.io.File;
042import java.io.IOException;
043import java.io.InputStream;
044
045/**
046 * @author Michael Koch (konqueror@gmx.de)
047 */
048public class FileCacheImageInputStream extends ImageInputStreamImpl
049{
050  private InputStream stream;
051  private File cacheDir;
052
053  public FileCacheImageInputStream(InputStream stream, File cacheDir)
054    throws IOException
055  {
056    super();
057    this.stream = stream;
058    // FIXME: We do not support caching yet.
059    this.cacheDir = cacheDir;
060  }
061
062  public void close()
063    throws IOException
064  {
065    if (stream != null)
066      {
067        stream.close();
068        stream = null;
069      }
070  }
071
072  private void checkStreamClosed()
073    throws IOException
074  {
075    if (stream == null)
076      throw new IOException("stream closed");
077  }
078
079  public boolean isCached()
080  {
081    return true;
082  }
083
084  public boolean isCachedFile()
085  {
086    return true;
087  }
088
089  public boolean isCachedMemory()
090  {
091    return false;
092  }
093
094  public int read()
095    throws IOException
096  {
097    checkStreamClosed();
098    setBitOffset(0);
099    return stream.read();
100  }
101
102  public int read(byte[] data, int offset, int len)
103    throws IOException
104  {
105    checkStreamClosed();
106    setBitOffset(0);
107    return stream.read(data, offset, len);
108  }
109}