org.eclipse.jgit/src/org/eclipse/jgit/util/io/CountingOutputStream.java

/*
 * Copyright (C) 2011, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.util.io;

import java.io.IOException;
import java.io.OutputStream;

/**
 * Counts the number of bytes written.
 */
public class CountingOutputStream extends OutputStream {
	private final OutputStream out;
	private long cnt;

	/**
	 * Initialize a new counting stream.
	 *
	 * @param out
	 *            stream to output all writes to.
	 */
	public CountingOutputStream(OutputStream out) {
		this.out = out;
	}

	/**
	 * Get current number of bytes written.
	 *
	 * @return current number of bytes written.
	 */
	public long getCount() {
		return cnt;
	}

	/** {@inheritDoc} */
	@Override
	public void write(int val) throws IOException {
		out.write(val);
		cnt++;
	}

	/** {@inheritDoc} */
	@Override
	public void write(byte[] buf, int off, int len) throws IOException {
		out.write(buf, off, len);
		cnt += len;
	}

	/** {@inheritDoc} */
	@Override
	public void flush() throws IOException {
		out.flush();
	}

	/** {@inheritDoc} */
	@Override
	public void close() throws IOException {
		out.close();
	}
}