| package org.apache.maven.shared.utils.cli; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| /** |
| * Read from an InputStream and write the output to an OutputStream. |
| * |
| * @author <a href="mailto:trygvis@inamo.no">Trygve Laugstøl</a> |
| * @version $Id$ |
| */ |
| class StreamFeeder |
| extends AbstractStreamHandler |
| { |
| |
| private final AtomicReference<InputStream> input; |
| |
| private final AtomicReference<OutputStream> output; |
| |
| private volatile Throwable exception; |
| |
| /** |
| * Create a new StreamFeeder |
| * |
| * @param input Stream to read from |
| * @param output Stream to write to |
| */ |
| StreamFeeder( InputStream input, OutputStream output ) |
| { |
| super(); |
| this.input = new AtomicReference<InputStream>( input ); |
| this.output = new AtomicReference<OutputStream>( output ); |
| } |
| |
| @Override |
| public void run() |
| { |
| try |
| { |
| feed(); |
| } |
| catch ( Throwable e ) |
| { |
| // Catch everything so the streams will be closed and flagged as done. |
| if ( this.exception != null ) |
| { |
| this.exception = e; |
| } |
| } |
| finally |
| { |
| close(); |
| |
| synchronized ( this ) |
| { |
| notifyAll(); |
| } |
| } |
| } |
| |
| public void close() |
| { |
| setDone(); |
| final InputStream is = input.getAndSet( null ); |
| if ( is != null ) |
| { |
| try |
| { |
| is.close(); |
| } |
| catch ( IOException ex ) |
| { |
| if ( this.exception != null ) |
| { |
| this.exception = ex; |
| } |
| } |
| } |
| |
| final OutputStream os = output.getAndSet( null ); |
| if ( os != null ) |
| { |
| try |
| { |
| os.close(); |
| } |
| catch ( IOException ex ) |
| { |
| if ( this.exception != null ) |
| { |
| this.exception = ex; |
| } |
| } |
| } |
| } |
| |
| /** |
| * @since 3.2.0 |
| */ |
| public Throwable getException() |
| { |
| return this.exception; |
| } |
| |
| @SuppressWarnings( "checkstyle:innerassignment" ) |
| private void feed() |
| throws IOException |
| { |
| InputStream is = input.get(); |
| OutputStream os = output.get(); |
| boolean flush = false; |
| |
| if ( is != null && os != null ) |
| { |
| for ( int data; !isDone() && ( data = is.read() ) != -1; ) |
| { |
| if ( !isDisabled() ) |
| { |
| os.write( data ); |
| flush = true; |
| } |
| } |
| |
| if ( flush ) |
| { |
| os.flush(); |
| } |
| } |
| } |
| |
| } |