/* * Copyright (c) 2001 Sun Microsystems, Inc.  All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * * 2. 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. * * 3. The end-user documentation included with the redistribution, *    if any, must include the following acknowledgment: *       "This product includes software developed by the *       Sun Microsystems, Inc. for Project JXTA." *    Alternately, this acknowledgment may appear in the software itself, *    if and wherever such third-party acknowledgments normally appear. * * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must *    not be used to endorse or promote products derived from this *    software without prior written permission. For written *    permission, please contact Project JXTA at http://www.jxta.org. * * 5. Products derived from this software may not be called "JXTA", *    nor may "JXTA" appear in their name, without prior written *    permission of Sun. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 SUN MICROSYSTEMS OR * ITS 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of Project JXTA.  For more * information on Project JXTA, please see * <http://www.jxta.org/>. * * This license is based on the BSD license adopted by the Apache Foundation. * * $Id: CountingInputStream.java,v 1.2 2003/01/17 18:49:52 bondolo Exp $ */package net.jxta.util;import java.io.*;/** *  A filter input stream which counts the bytes read from the stream. A filter *  so that you don't have to count seperately from reading from the inoput * **/public class CountingInputStream extends FilterInputStream {        /**     *  For recursion detection to prevent overcounting.     **/    private transient boolean alreadycounting;        /**     *  number of bytes which have been read on this stream     **/    private long bytesRead = 0;        /**     *  Make a new Counting Input Stream     **/    public CountingInputStream(InputStream in) {        super(in);    }        /**     * {@inheritDoc}     *     *  <p/>Debugging toString.     **/    public String toString() {        if( null == in ) {            return "closed/" + super.toString();        } else {            return in.toString() + "/" + super.toString();        }    }        /**     * {@inheritDoc}     *     * <p/>Merely calls the super version.     **/    public synchronized int read() throws IOException {        boolean wascounting = alreadycounting;        alreadycounting = true;        int i = super.read();        alreadycounting = wascounting;                if ( !alreadycounting && (i != -1) )            bytesRead++;        return i;    }        /**     * {@inheritDoc}     *     * <p/>calls the super version of the same method.     **/    public synchronized int read(byte[] b, int off, int len) throws IOException {        boolean wascounting = alreadycounting;        alreadycounting = true;                int i = super.read(b, off, len);        alreadycounting = wascounting;                if( (-1 != i) && !alreadycounting )            bytesRead += i;                return i;    }        /**     *  Returns the number of bytes read fromthe stream thus far. This and all     *  the methods in this class are synchronized because bytesRead cannot be     *  volatile.     *     *  @return long containing the number of bytes read.     **/    public synchronized long getBytesRead() {        return bytesRead;    }}