| /* |
| * 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.tools.ant.taskdefs; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| /** |
| * Copies all data from an input stream to an output stream. |
| * |
| * @since Ant 1.2 |
| */ |
| public class StreamPumper implements Runnable { |
| |
| private static final int SMALL_BUFFER_SIZE = 128; |
| |
| private InputStream is; |
| private OutputStream os; |
| private volatile boolean finish; |
| private volatile boolean finished; |
| private boolean closeWhenExhausted; |
| private boolean autoflush = false; |
| private Exception exception = null; |
| private int bufferSize = SMALL_BUFFER_SIZE; |
| private boolean started = false; |
| |
| /** |
| * Create a new StreamPumper. |
| * |
| * @param is input stream to read data from |
| * @param os output stream to write data to. |
| * @param closeWhenExhausted if true, the output stream will be closed when |
| * the input is exhausted. |
| */ |
| public StreamPumper(InputStream is, OutputStream os, boolean closeWhenExhausted) { |
| this.is = is; |
| this.os = os; |
| this.closeWhenExhausted = closeWhenExhausted; |
| } |
| |
| /** |
| * Create a new StreamPumper. |
| * |
| * @param is input stream to read data from |
| * @param os output stream to write data to. |
| */ |
| public StreamPumper(InputStream is, OutputStream os) { |
| this(is, os, 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 |
| * @since Ant 1.6.3 |
| */ |
| /*package*/ 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 (true) { |
| length = is.read(buf); |
| if ((length <= 0) || finish) { |
| break; |
| } |
| os.write(buf, 0, length); |
| if (autoflush) { |
| os.flush(); |
| } |
| } |
| os.flush(); |
| } catch (Exception e) { |
| synchronized (this) { |
| exception = e; |
| } |
| } finally { |
| if (closeWhenExhausted) { |
| try { |
| os.close(); |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| finished = true; |
| synchronized (this) { |
| notifyAll(); |
| } |
| } |
| } |
| |
| /** |
| * Tells whether the end of the stream has been reached. |
| * @return true is the stream has been exhausted. |
| */ |
| public boolean isFinished() { |
| return finished; |
| } |
| |
| /** |
| * This method blocks until the StreamPumper finishes. |
| * @throws InterruptedException if interrupted. |
| * @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(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 int size of the read buffer. |
| */ |
| public synchronized int getBufferSize() { |
| return bufferSize; |
| } |
| |
| /** |
| * Get the exception encountered, if any. |
| * @return the Exception encountered. |
| */ |
| 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. |
| * @since Ant 1.6.3 |
| */ |
| /*package*/ synchronized void stop() { |
| finish = true; |
| notifyAll(); |
| } |
| } |