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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.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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