    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 * http://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.commons.compress.utils;
    020
    021import java.io.FilterOutputStream;
    022import java.io.IOException;
    023import java.io.OutputStream;
    024
    025/**
    026 * Stream that tracks the number of bytes read.
    027 * @since 1.3
    028 * @NotThreadSafe
    029 */
    030public class CountingOutputStream extends FilterOutputStream {
    031    private long bytesWritten = 0;
    032
    033    public CountingOutputStream(final OutputStream out) {
    034        super(out);
    035    }
    036
    037    @Override
    038    public void write(final int b) throws IOException {
    039        out.write(b);
    040        count(1);
    041    }
    042    @Override
    043    public void write(final byte[] b) throws IOException {
    044        write(b, 0, b.length);
    045    }
    046    @Override
    047    public void write(final byte[] b, final int off, final int len) throws IOException {
    048        out.write(b, off, len);
    049        count(len);
    050    }
    051
    052    /**
    053     * Increments the counter of already written bytes.
    054     * Doesn't increment if the EOF has been hit (written == -1)
    055     *
    056     * @param written the number of bytes written
    057     */
    058    protected void count(final long written) {
    059        if (written != -1) {
    060            bytesWritten += written;
    061        }
    062    }
    063
    064    /**
    065     * Returns the current number of bytes written to this stream.
    066     * @return the number of written bytes
    067     */
    068    public long getBytesWritten() {
    069        return bytesWritten;
    070    }
    071}