| /* FileCacheImageOutputStream.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.imageio.stream; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.RandomAccessFile; |
| |
| /** |
| * @author Michael Koch (konqueror@gmx.de) |
| */ |
| public class FileCacheImageOutputStream extends ImageOutputStreamImpl |
| { |
| private OutputStream stream; |
| private File cacheFile; |
| private RandomAccessFile cache; |
| private long maxPos; |
| |
| public FileCacheImageOutputStream(OutputStream s, File cacheDir) |
| throws IOException |
| { |
| stream = s; |
| cacheFile = File.createTempFile("imageio", ".tmp", cacheDir); |
| cache = new RandomAccessFile(cacheFile, "rw"); |
| maxPos = 0; |
| } |
| |
| public void close() |
| throws IOException |
| { |
| maxPos = cache.length(); |
| seek(maxPos); |
| flushBefore(maxPos); |
| super.close(); |
| cache.close(); |
| cacheFile.delete(); |
| stream.flush(); |
| stream = null; |
| } |
| |
| public boolean isCached() |
| { |
| return true; |
| } |
| |
| public boolean isCachedFile() |
| { |
| return true; |
| } |
| |
| public boolean isCachedMemory() |
| { |
| return false; |
| } |
| |
| public int read() |
| throws IOException |
| { |
| bitOffset = 0; |
| int val = cache.read(); |
| if (val != -1) |
| streamPos++; |
| return val; |
| } |
| |
| public int read(byte[] data, int offset, int len) |
| throws IOException |
| { |
| bitOffset = 0; |
| int num = cache.read(data, offset, len); |
| if (num != -1) |
| streamPos += num; |
| return num; |
| } |
| |
| public void write(byte[] data, int offset, int len) |
| throws IOException |
| { |
| flushBits(); |
| cache.write(data, offset, len); |
| streamPos += len; |
| maxPos = Math.max(streamPos, maxPos); |
| } |
| |
| public void write(int value) |
| throws IOException |
| { |
| flushBits(); |
| cache.write(value); |
| streamPos++; |
| maxPos = Math.max(streamPos, maxPos); |
| } |
| |
| public long length() |
| { |
| long l; |
| try |
| { |
| l = cache.length(); |
| } |
| catch (IOException ex) |
| { |
| l = -1; |
| } |
| return l; |
| } |
| |
| public void seek(long pos) |
| throws IOException |
| { |
| checkClosed(); |
| if (pos < flushedPos) |
| throw new IndexOutOfBoundsException(); |
| cache.seek(pos); |
| streamPos = cache.getFilePointer(); |
| maxPos = Math.max(streamPos, maxPos); |
| bitOffset = 0; |
| } |
| |
| public void flushBefore(long pos) |
| throws IOException |
| { |
| long oldPos = flushedPos; |
| super.flushBefore(pos); |
| long flushed = flushedPos - oldPos; |
| if (flushed > 0) |
| { |
| int len = 512; |
| byte[] buf = new byte[len]; |
| cache.seek(oldPos); |
| while (flushed > 0) |
| { |
| int l = (int) Math.min(flushed, len); |
| cache.readFully(buf, 0, l); |
| stream.write(buf, 0, l); |
| flushed -= l; |
| } |
| stream.flush(); |
| } |
| } |
| } |