/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.processing.io;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;

public class CountingReadableByteChannel implements ReadableByteChannel {

	private final ReadableByteChannel inner;
	private long bytesRead;

	public CountingReadableByteChannel(ReadableByteChannel inner) {
		this.inner = inner;
	}

	@Override
	public int read(ByteBuffer dst) throws IOException {
		int bytes = inner.read(dst);
		bytesRead += bytes;
		return bytes;
	}

	@Override
	public boolean isOpen() {
		return inner.isOpen();
	}

	@Override
	public void close() throws IOException {
		inner.close();
	}

	public long bytesRead() {
		return bytesRead;
	}

	public void resetBytesRead() {
		bytesRead = 0;
	}
}