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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.IOException;
/**
* StreamCache implementation that uses temporary files rather than heap.
*/
public class InMemoryStreamCache implements StreamCache {
private int hintSize = -1;
/**
* The current output stream.
*/
private ByteArrayOutputStream output;
/**
* Creates a new InMemoryStreamCache.
*/
public InMemoryStreamCache() {
}
/**
* Creates a new InMemoryStreamCache.
* @param hintSize a hint about the approximate expected size of the buffer
*/
public InMemoryStreamCache(int hintSize) {
this.hintSize = hintSize;
}
/**
* Get the current OutputStream. Do not store it - it may change
* from call to call.
* @throws IOException if there is an error getting the output stream
* @return the output stream containing the data
*/
public OutputStream getOutputStream() throws IOException {
if (output == null) {
if (this.hintSize <= 0) {
output = new ByteArrayOutputStream(512);
} else {
output = new ByteArrayOutputStream(this.hintSize);
}
}
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 writing to the output stream
*/
public int outputContents(OutputStream out) throws IOException {
if (output == null) {
return 0;
}
output.writeTo(out);
return output.size();
}
/**
* Returns the current size of the stream.
* @throws IOException if there is an error getting the size
* @return the length of the stream
*/
public int getSize() throws IOException {
if (output == null) {
return 0;
} else {
return output.size();
}
}
/**
* Clears and resets the cache.
* @throws IOException if there is an error closing the stream
*/
public void clear() throws IOException {
if (output != null) {
output.close();
output = null;
}
}
}
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