| /* |
| * 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. |
| */ |
| package org.apache.commons.io.output; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.commons.io.IOUtils; |
| |
| /** |
| * Forwards data to a stream that has been associated with this thread. |
| */ |
| public class DemuxOutputStream extends OutputStream { |
| private final InheritableThreadLocal<OutputStream> outputStreamThreadLocal = new InheritableThreadLocal<>(); |
| |
| /** |
| * Binds the specified stream to the current thread. |
| * |
| * @param output |
| * the stream to bind |
| * @return the OutputStream that was previously active |
| */ |
| public OutputStream bindStream(final OutputStream output) { |
| final OutputStream stream = outputStreamThreadLocal.get(); |
| outputStreamThreadLocal.set(output); |
| return stream; |
| } |
| |
| /** |
| * Closes stream associated with current thread. |
| * |
| * @throws IOException |
| * if an error occurs |
| */ |
| @SuppressWarnings("resource") // we actually close the stream here |
| @Override |
| public void close() throws IOException { |
| IOUtils.close(outputStreamThreadLocal.get()); |
| } |
| |
| /** |
| * Flushes stream associated with current thread. |
| * |
| * @throws IOException |
| * if an error occurs |
| */ |
| @Override |
| public void flush() throws IOException { |
| @SuppressWarnings("resource") |
| final OutputStream output = outputStreamThreadLocal.get(); |
| if (null != output) { |
| output.flush(); |
| } |
| } |
| |
| /** |
| * Writes byte to stream associated with current thread. |
| * |
| * @param ch |
| * the byte to write to stream |
| * @throws IOException |
| * if an error occurs |
| */ |
| @Override |
| public void write(final int ch) throws IOException { |
| @SuppressWarnings("resource") |
| final OutputStream output = outputStreamThreadLocal.get(); |
| if (null != output) { |
| output.write(ch); |
| } |
| } |
| } |