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/*
* $Id: StreamCache.java,v 1.3 2003/03/07 08:25:47 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 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;
import java.io.IOException;
/**
* This class is serves as a factory from
*/
public class StreamCacheFactory {
private static boolean defaultCacheToFile = false;
private static StreamCacheFactory fileInstance = null;
private static StreamCacheFactory memoryInstance = null;
private boolean cacheToFile = false;
/**
* Returns an instance of a StreamCacheFactory with the requested features.
* @param cacheToFile True if file shall be cached using a temporary file
* @return StreamCacheFactory the requested factory
*/
public static StreamCacheFactory getInstance(boolean cacheToFile) {
if (cacheToFile) {
if (fileInstance == null) {
fileInstance = new StreamCacheFactory(true);
}
return fileInstance;
} else {
if (memoryInstance == null) {
memoryInstance = new StreamCacheFactory(false);
}
return memoryInstance;
}
}
/**
* Returns an instance of a StreamCacheFactory depending on the default
* setting for cacheToFile.
* @return StreamCacheFactory the requested factory
*/
public static StreamCacheFactory getInstance() {
return getInstance(defaultCacheToFile);
}
/**
* Sets the global default for cacheToFile
* @param cacheToFile True if stream caches should be held in files.
*/
public static void setDefaultCacheToFile(boolean cacheToFile) {
defaultCacheToFile = cacheToFile;
}
/**
* Creates a new StreamCacheFactory.
* @param cacheToFile True if file shall be cached using a temporary file
*/
public StreamCacheFactory(boolean cacheToFile) {
this.cacheToFile = 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 StreamCache createStreamCache() throws IOException {
if (this.cacheToFile) {
return new TempFileStreamCache();
} else {
return new InMemoryStreamCache();
}
}
/**
* Get the correct implementation (based on cacheToFile) of
* StreamCache.
* @param hintSize a hint about the approximate expected size of the buffer
* @throws IOException if there is an IO error
* @return a new StreamCache for caching streams
*/
public StreamCache createStreamCache(int hintSize) throws IOException {
if (this.cacheToFile) {
return new TempFileStreamCache();
} else {
return new InMemoryStreamCache(hintSize);
}
}
/**
* Get the value of the global cacheToFile flag.
* @return the current cache to file flag
*/
public boolean getCacheToFile() {
return this.cacheToFile;
}
}
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