| /* |
| * 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.karaf.shell.wrapper; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| // |
| // Based on Apache Ant 1.6.5 |
| // |
| |
| /** |
| * Copies all data from an input stream to an output stream. |
| * |
| * @version $Rev: 705608 $ $Date: 2008-10-17 15:28:45 +0200 (Fri, 17 Oct 2008) $ |
| */ |
| public class StreamPumper |
| implements Runnable |
| { |
| private InputStream in; |
| |
| private OutputStream out; |
| |
| private volatile boolean finish; |
| |
| private volatile boolean finished; |
| |
| private boolean closeWhenExhausted; |
| |
| private boolean autoflush; |
| |
| private Exception exception; |
| |
| private int bufferSize = 128; |
| |
| private boolean started; |
| |
| /** |
| * Create a new stream pumper. |
| * |
| * @param in Input stream to read data from |
| * @param out Output stream to write data to. |
| * @param closeWhenExhausted If true, the output stream will be closed when |
| * the input is exhausted. |
| */ |
| public StreamPumper(final InputStream in, final OutputStream out, final boolean closeWhenExhausted) { |
| assert in != null; |
| assert out != null; |
| |
| this.in = in; |
| this.out = out; |
| this.closeWhenExhausted = closeWhenExhausted; |
| } |
| |
| /** |
| * Create a new stream pumper. |
| * |
| * @param in Input stream to read data from |
| * @param out Output stream to write data to. |
| */ |
| public StreamPumper(final InputStream in, final OutputStream out) { |
| this(in, out, false); |
| } |
| |
| /** |
| * Set whether data should be flushed through to the output stream. |
| * |
| * @param autoflush If true, push through data; if false, let it be buffered |
| */ |
| public void setAutoflush(boolean autoflush) { |
| this.autoflush = autoflush; |
| } |
| |
| /** |
| * Copies data from the input stream to the output stream. |
| * |
| * Terminates as soon as the input stream is closed or an error occurs. |
| */ |
| public void run() { |
| synchronized (this) { |
| started = true; |
| } |
| finished = false; |
| finish = false; |
| |
| final byte[] buf = new byte[bufferSize]; |
| |
| int length; |
| try { |
| while ((length = in.read(buf)) > 0 && !finish) { |
| out.write(buf, 0, length); |
| if (autoflush) { |
| out.flush(); |
| } |
| } |
| out.flush(); |
| } |
| catch (Exception e) { |
| synchronized (this) { |
| exception = e; |
| } |
| } |
| finally { |
| if (closeWhenExhausted) { |
| try { |
| out.close(); |
| } catch (IOException e) { } |
| } |
| finished = true; |
| |
| synchronized (this) { |
| notifyAll(); |
| } |
| } |
| } |
| |
| /** |
| * Tells whether the end of the stream has been reached. |
| * |
| * @return true If the stream has been exhausted. |
| */ |
| public boolean isFinished() { |
| return finished; |
| } |
| |
| /** |
| * This method blocks until the stream pumper finishes. |
| * |
| * @see #isFinished() |
| */ |
| public synchronized void waitFor() throws InterruptedException { |
| while (!isFinished()) { |
| wait(); |
| } |
| } |
| |
| /** |
| * Set the size in bytes of the read buffer. |
| * |
| * @param bufferSize the buffer size to use. |
| * @throws IllegalStateException if the StreamPumper is already running. |
| */ |
| public synchronized void setBufferSize(final int bufferSize) { |
| if (started) { |
| throw new IllegalStateException("Cannot set buffer size on a running StreamPumper"); |
| } |
| |
| this.bufferSize = bufferSize; |
| } |
| |
| /** |
| * Get the size in bytes of the read buffer. |
| * |
| * @return The size of the read buffer. |
| */ |
| public synchronized int getBufferSize() { |
| return bufferSize; |
| } |
| |
| /** |
| * Get the exception encountered, if any. |
| * |
| * @return The Exception encountered; or null if there was none. |
| */ |
| public synchronized Exception getException() { |
| return exception; |
| } |
| |
| /** |
| * Stop the pumper as soon as possible. |
| * |
| * Note that it may continue to block on the input stream |
| * but it will really stop the thread as soon as it gets EOF |
| * or any byte, and it will be marked as finished. |
| */ |
| public synchronized void stop() { |
| finish = true; |
| |
| notifyAll(); |
| } |
| } |