com.lithium.flow.streams.CounterInputStream Maven / Gradle / Ivy

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/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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 com.lithium.flow.streams;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.atomic.AtomicLong;

import javax.annotation.Nonnull;

/**
 * @author Matt Ayres
 */
public class CounterInputStream extends FilterInputStream {
	private final AtomicLong counter;
	private long mark;

	public CounterInputStream(@Nonnull InputStream in, @Nonnull AtomicLong counter) {
		super(in);
		this.counter = counter;
	}

	@Override
	public int read() throws IOException {
		int read = in.read();
		if (read != -1) {
			counter.incrementAndGet();
		}
		return read;
	}

	@Override
	public int read(@Nonnull byte[] b) throws IOException {
		int read = in.read(b);
		if (read != -1) {
			counter.addAndGet(read);
		}
		return read;
	}

	@Override
	public int read(@Nonnull byte[] b, int off, int len) throws IOException {
		int read = in.read(b, off, len);
		if (read != -1) {
			counter.addAndGet(read);
		}
		return read;
	}

	@Override
	public long skip(long n) throws IOException {
		long read = in.skip(n);
		counter.addAndGet(read);
		return read;
	}

	@Override
	public void mark(int limit) {
		in.mark(limit);
		mark = counter.get();
	}

	@Override
	public void reset() throws IOException {
		in.reset();
		counter.set(mark);
	}
}