org.springframework.build.aws.maven/src/main/java/org/springframework/aws/maven/TransferProgressFileOutputStream.java

/*
 * Copyright 2010 SpringSource
 *
 * Licensed 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.springframework.aws.maven;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * An extension to the {@link FileOutputStream} that notifies a
 * @{link TransferProgress} object as it is being written to.
 * 
 * @author Ben Hale
 * @since 1.1
 */
class TransferProgressFileOutputStream extends FileOutputStream {

	private TransferProgress progress;

	public TransferProgressFileOutputStream(File file, TransferProgress progress) throws FileNotFoundException {
		super(file);
		this.progress = progress;
	}

	public void write(int b) throws IOException {
		super.write(b);
		progress.notify(new byte[] { (byte) b }, 1);
	}

	public void write(byte b[]) throws IOException {
		super.write(b);
		progress.notify(b, b.length);
	}

	public void write(byte b[], int off, int len) throws IOException {
		super.write(b, off, len);
		if (off == 0) {
			progress.notify(b, len);
		}
		else {
			byte[] bytes = new byte[len];
			System.arraycopy(b, off, bytes, 0, len);
			progress.notify(bytes, len);
		}
	}
}