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/*
* $Id: TempFileStreamCache.java,v 1.3 2003/03/07 08:25:46 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2004 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.pdf;
// Java
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.File;
//Commons
import org.apache.commons.io.CopyUtils;
/**
* StreamCache implementation that uses temporary files rather than heap.
*/
public class TempFileStreamCache implements StreamCache {
/**
* The current output stream.
*/
private OutputStream output;
/**
* The temp file.
*/
private File tempFile;
/**
* Creates a new TempFileStreamCache.
*
* @throws IOException if there is an IO error
*/
public TempFileStreamCache() throws IOException {
tempFile = File.createTempFile("org.apache.fop.pdf.StreamCache-",
".temp");
tempFile.deleteOnExit();
}
/**
* Get the current OutputStream. Do not store it - it may change
* from call to call.
*
* @throws IOException if there is an IO error
* @return the output stream for this cache
*/
public OutputStream getOutputStream() throws IOException {
if (output == null) {
output = new java.io.BufferedOutputStream(
new java.io.FileOutputStream(tempFile));
}
return output;
}
/**
* @see org.apache.fop.pdf.StreamCache#write(byte[])
*/
public void write(byte[] data) throws IOException {
getOutputStream().write(data);
}
/**
* Outputs the cached bytes to the given stream.
*
* @param out the output stream to write to
* @return the number of bytes written
* @throws IOException if there is an IO error
*/
public int outputContents(OutputStream out) throws IOException {
if (output == null) {
return 0;
}
output.close();
output = null;
// don't need a buffer because streamCopy is buffered
InputStream input = new java.io.FileInputStream(tempFile);
final long bytesCopied = CopyUtils.copy(input, out);
input.close();
return (int)bytesCopied;
}
/**
* Returns the current size of the stream.
*
* @throws IOException if there is an IO error
* @return the size of the cache
*/
public int getSize() throws IOException {
if (output != null) {
output.flush();
}
return (int) tempFile.length();
}
/**
* Clears and resets the cache.
*
* @throws IOException if there is an IO error
*/
public void clear() throws IOException {
if (output != null) {
output.close();
output = null;
}
if (tempFile.exists()) {
tempFile.delete();
}
}
}
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