| /* |
| * 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; |
| |
| // Java |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| import java.io.File; |
| |
| //Commons |
| import org.apache.commons.io.IOUtils; |
| |
| /** |
| * StreamCache implementation that uses temporary files rather than heap. |
| */ |
| public class TempFileStreamCache implements StreamCache { |
| |
| /** |
| * The current output stream. |
| */ |
| private OutputStream output; |
| |
| /** |
| * The temp file. |
| */ |
| private File tempFile; |
| |
| /** |
| * Creates a new TempFileStreamCache. |
| * |
| * @throws IOException if there is an IO error |
| */ |
| public TempFileStreamCache() throws IOException { |
| tempFile = File.createTempFile("org.apache.fop.pdf.StreamCache-", |
| ".temp"); |
| tempFile.deleteOnExit(); |
| } |
| |
| /** |
| * Get the current OutputStream. Do not store it - it may change |
| * from call to call. |
| * |
| * @throws IOException if there is an IO error |
| * @return the output stream for this cache |
| */ |
| public OutputStream getOutputStream() throws IOException { |
| if (output == null) { |
| output = new java.io.BufferedOutputStream( |
| new java.io.FileOutputStream(tempFile)); |
| } |
| return output; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| 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 |
| */ |
| public int outputContents(OutputStream out) throws IOException { |
| if (output == null) { |
| return 0; |
| } |
| |
| output.close(); |
| output = null; |
| |
| // don't need a buffer because copy() is buffered |
| InputStream input = new java.io.FileInputStream(tempFile); |
| try { |
| return IOUtils.copy(input, out); |
| } finally { |
| IOUtils.closeQuietly(input); |
| } |
| } |
| |
| /** |
| * Returns the current size of the stream. |
| * |
| * @throws IOException if there is an IO error |
| * @return the size of the cache |
| */ |
| public int getSize() throws IOException { |
| if (output != null) { |
| output.flush(); |
| } |
| return (int) tempFile.length(); |
| } |
| |
| /** |
| * Clears and resets the cache. |
| * |
| * @throws IOException if there is an IO error |
| */ |
| public void clear() throws IOException { |
| if (output != null) { |
| output.close(); |
| output = null; |
| } |
| if (tempFile.exists()) { |
| tempFile.delete(); |
| } |
| } |
| } |