| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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; |
| } |
| |
| |
| } |