001package org.apache.commons.jcs.admin;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.io.IOException;
023import java.io.OutputStream;
024
025/**
026 * Keeps track of the number of bytes written to it, but doesn't write them anywhere.
027 */
028public class CountingOnlyOutputStream
029    extends OutputStream
030{
031    /** number of bytes passed through */
032    private int count; // TODO should this be long?
033
034    /**
035     * count as we write.
036     * <p>
037     * @param b
038     * @throws IOException
039     */
040    @Override
041    public void write( byte[] b )
042        throws IOException
043    {
044        this.count += b.length;
045    }
046
047    /**
048     * count as we write.
049     * <p>
050     * @param b
051     * @param off
052     * @param len
053     * @throws IOException
054     */
055    @Override
056    public void write( byte[] b, int off, int len )
057        throws IOException
058    {
059        this.count += len;
060    }
061
062    /**
063     * count as we write.
064     * <p>
065     * @param b
066     * @throws IOException
067     */
068    @Override
069    public void write( int b )
070        throws IOException
071    {
072        this.count++;
073    }
074
075    /**
076     * The number of bytes that have passed through this stream.
077     * <p>
078     * @return int
079     */
080    public int getCount()
081    {
082        return this.count;
083    }
084}