Source for javax.imageio.stream.FileCacheImageInputStream

 1:  /* FileCacheImageInputStream.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.stream;
 40: 
 41:  import java.io.File;
 42:  import java.io.IOException;
 43:  import java.io.InputStream;
 44: 
 45:  /**
 46:  * @author Michael Koch (konqueror@gmx.de)
 47:  */
 48:  public class FileCacheImageInputStream extends ImageInputStreamImpl
 49: {
 50:  private InputStream stream;
 51:  private File cacheDir;
 52:  
 53:  public FileCacheImageInputStream(InputStream stream, File cacheDir)
 54:  throws IOException
 55:  {
 56:  super();
 57:  this.stream = stream;
 58:  // FIXME: We do not support caching yet.
 59:  this.cacheDir = cacheDir;
 60:  }
 61: 
 62:  public void close()
 63:  throws IOException
 64:  {
 65:  if (stream != null)
 66:  {
 67:  stream.close();
 68:  stream = null;
 69:  }
 70:  }
 71: 
 72:  private void checkStreamClosed()
 73:  throws IOException
 74:  {
 75:  if (stream == null)
 76:  throw new IOException("stream closed");
 77:  }
 78: 
 79:  public boolean isCached()
 80:  {
 81:  return true;
 82:  }
 83: 
 84:  public boolean isCachedFile()
 85:  {
 86:  return true;
 87:  }
 88:  
 89:  public boolean isCachedMemory()
 90:  {
 91:  return false;
 92:  }
 93: 
 94:  public int read()
 95:  throws IOException
 96:  {
 97:  checkStreamClosed();
 98:  setBitOffset(0);
 99:  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: }