markprohibitedfilterstream.java

JXTA&#8482 is a set of open, generalized peer-to-peer (P2P) protocols that allow any networked devi

/*
 * Copyright (c) 2001-2007 Sun Microsystems, Inc.  All rights reserved.
 *  
 *  The Sun Project JXTA(TM) Software License
 *  
 *  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 Sun Microsystems, Inc. for JXTA(TM) technology." 
 *     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 
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 *  
 *  JXTA is a registered trademark of Sun Microsystems, Inc. in the United 
 *  States and other countries.
 *  
 *  Please see the license information page at :
 *  <http://www.jxta.org/project/www/license.html> for instructions on use of 
 *  the license in source files.
 *  
 *  ====================================================================
 *  
 *  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. 
 */

package net.jxta.util;


import java.io.FilterInputStream;
import java.io.InputStream;

import java.io.IOException;


/**
 *  Implements a filter which disables the mark() feature of an input stream.
 *  Useful for when the stream is shared.
 **/
public class MarkProhibitedFilterStream extends FilterInputStream {
    
    /**
     * Creates a new instance of MarkProhibitedFilterStream
     *
     *    @param  in  the stream which will be limited.
     */
    public MarkProhibitedFilterStream(InputStream in) {
        super(in);
    }
    
    /**
     *	{@inheritDoc}
     *
     *	<p/>This method does nothing.
     **/
    @Override
    public void mark(int readlimit) {}
    
    /**
     *	{@inheritDoc}
     *
     *	<p/>This implementation always throws IOException since mark is not
     *	supported.
     */
    @Override
    public void reset() throws IOException {
        throw new IOException("reset() not supported");
    }
    
    /**
     *	{@inheritDoc}
     *
     * <p/>This method simply returns false.
     **/
    @Override
    public boolean markSupported() {
        return false;
    }
    
}