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/*
* $Id$
* Copyright (C) 2001-2003 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.pdf;
import java.io.OutputStream;
import java.io.IOException;
/**
* class used to store the bytes for a PDFStream. It's actually a generic
* cached byte array, along with a factory that returns either an
* in-memory or tempfile based implementation based on the global
* cacheToFile setting.
*/
public abstract class StreamCache {
/**
* Global setting; controls whether to use tempfiles or not.
*/
private static boolean cacheToFile = false;
/**
* Change the global cacheToFile flag.
*
* @param tizit true if cache to file
*/
public static void setCacheToFile(boolean tizit) {
cacheToFile = tizit;
}
/**
* Get the value of the global cacheToFile flag.
*
* @return the current cache to file flag
*/
public static boolean getCacheToFile() {
return cacheToFile;
}
/**
* Get the correct implementation (based on cacheToFile) of
* StreamCache.
*
* @throws IOException if there is an IO error
* @return a new StreamCache for caching streams
*/
public static StreamCache createStreamCache() throws IOException {
if (cacheToFile) {
return new TempFileStreamCache();
} else {
return new InMemoryStreamCache();
}
}
/**
* Get the current OutputStream. Do not store it - it may change
* from call to call.
*
* @throws IOException if there is an IO error
* @return an output stream for this cache
*/
public abstract OutputStream getOutputStream() throws IOException;
/**
* Filter the cache with the supplied PDFFilter.
*
* @param filter the filter to apply
* @throws IOException if there is an IO error
*/
public abstract void applyFilter(PDFFilter filter) throws IOException;
/**
* Outputs the cached bytes to the given stream.
*
* @param stream the stream to write to
* @throws IOException if there is an IO error
*/
public abstract void outputStreamData(OutputStream stream) throws IOException;
/**
* Returns the current size of the stream.
*
* @throws IOException if there is an IO error
* @return the size of the cache
*/
public abstract int getSize() throws IOException;
/**
* Closes the cache and frees resources.
*
* @throws IOException if there is an IO error
*/
public abstract void close() throws IOException;
/**
* Clears and resets the cache.
*
* @throws IOException if there is an IO error
*/
public abstract void reset() throws IOException;
}
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