taverna-io/src/main/java/org/apache/taverna/lang/io/StreamCopier.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.taverna.lang.io;

import java.io.InputStream;
import java.io.OutputStream;

import org.apache.log4j.Logger;

/**
 * Copies an InputStream to an OutputStream.
 * 
 * @author Tom Oinn
 */
public class StreamCopier extends Thread {

	private static Logger logger = Logger
	.getLogger(StreamCopier.class);

	InputStream is;

	OutputStream os;

	/**
	 * Create a new StreamCopier which will, when started, copy the specified
	 * InputStream to the specified OutputStream
	 */
	public StreamCopier(InputStream is, OutputStream os) {
		super("StreamCopier");
		this.is = is;
		this.os = os;
	}

	/**
	 * Start copying the stream, exits when the InputStream runs out of data
	 */
	public void run() {
		try {
			byte[] buffer = new byte[1024];
			int bytesRead;
			while ((bytesRead = is.read(buffer)) != -1) {
				os.write(buffer, 0, bytesRead);
			}
			os.flush();
			os.close();
		} catch (Exception ex) {
			logger.error("Could not copy stream", ex);
		}
	}

}