DemuxInputStream.java
- /*
- * 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.input;
- import static org.apache.commons.io.IOUtils.EOF;
- import java.io.IOException;
- import java.io.InputStream;
- import org.apache.commons.io.IOUtils;
- /**
- * Data written to this stream is forwarded to a stream that has been associated with this thread.
- */
- public class DemuxInputStream extends InputStream {
- private final InheritableThreadLocal<InputStream> inputStreamLocal = new InheritableThreadLocal<>();
- /**
- * Construct a new instance.
- */
- public DemuxInputStream() {
- // empty
- }
- /**
- * Binds the specified stream to the current thread.
- *
- * @param input the stream to bind
- * @return the InputStream that was previously active
- */
- public InputStream bindStream(final InputStream input) {
- final InputStream oldValue = inputStreamLocal.get();
- inputStreamLocal.set(input);
- return oldValue;
- }
- /**
- * 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(inputStreamLocal.get());
- }
- /**
- * Reads byte from stream associated with current thread.
- *
- * @return the byte read from stream
- * @throws IOException if an error occurs
- */
- @Override
- public int read() throws IOException {
- final InputStream inputStream = inputStreamLocal.get();
- if (null != inputStream) {
- return inputStream.read();
- }
- return EOF;
- }
- }