/* * Copyright (c) 2005, John Mettraux, OpenWFE.org * All rights reserved. *  * Redistribution and use in source and binary forms, with or without  * modification, are permitted provided that the following conditions are met: *  * . Redistributions of source code must retain the above copyright notice, this *   list of conditions and the following disclaimer.   *  * . 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. *  * . Neither the name of the "OpenWFE" nor the names of its contributors may be *   used to endorse or promote products derived from this software without *   specific prior written permission. *  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"  * AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR 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. * * $Id: ChannelInputStream.java,v 1.4 2005/07/13 20:53:39 jmettraux Exp $ *///// ChannelInputStream.java//// john.mettraux@openwfe.org//// generated with // jtmpl 1.1.01 2004/05/19 (john.mettraux@openwfe.org)//package openwfe.org.net;import java.nio.ByteBuffer;import java.nio.channels.ReadableByteChannel;/** * Wrapping a channel inside of an InputStream. * The initial intent of this method is to feed a SAXBuilder with a Channel.<br> * We had to implement this class in order to avoid 'non-blocking' problems * with Channels.newInputStream(ch); ... * * <p><font size=2>CVS Info : * <br>$Author: jmettraux $ * <br>$Id: ChannelInputStream.java,v 1.4 2005/07/13 20:53:39 jmettraux Exp $ </font> * * @author john.mettraux@openwfe.org */public class ChannelInputStream    extends java.io.InputStream{    /*    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger        .getLogger(ChannelInputStream.class.getName());    */    //    // CONSTANTS & co    private final static int MAX_ATTEMPT = 3;    //    // FIELDS    private ReadableByteChannel channel = null;    //    // CONSTRUCTORS    /**     * This constructor wraps the given channel.     */    public ChannelInputStream (final ReadableByteChannel channel)    {        this.channel = channel;    }    //    // METHODS from InputStream    /**     * Reads and returns the next byte of the channel.     */    public int read ()        throws java.io.IOException    {        //log.debug("read()");        final ByteBuffer buffer = ByteBuffer.allocateDirect(1);        final int readCount = this.channel.read(buffer);        if (readCount < 1) return -1;        //log.debug("read() 0 buffer remaining : "+buffer.remaining());        buffer.flip();        //log.debug("read() 1 buffer remaining : "+buffer.remaining());        final int result = buffer.get();        buffer.clear();        return result;    }    /**     * Reads byte into a given byte array, returns the count of byte read     * from the channel.     */    public int read (final byte[] ba)        throws java.io.IOException    {        //log.debug("read(ba)");        final ByteBuffer buffer = ByteBuffer.wrap(ba);        final int readCount = this.channel.read(buffer);        return readCount;    }    /**     * Reads byte into a given byte array, returns the count of byte read     * from the channel.     */    public int read (final byte[] ba, final int offset, final int length)        throws java.io.IOException    {        //log.debug("read(ba, o, l) : (ba, "+offset+", "+length+")");        return read(0, ba, offset, length);    }    /*     * doing the job     */    private int read         (final int attempt, final byte[] ba, final int offset, final int length)    throws         java.io.IOException    {        //log.debug        //    ("read(a, ba, o, l) : ("+attempt+", ba, "+offset+", "+length+")");        if (attempt > MAX_ATTEMPT) return -1;        final ByteBuffer buffer = ByteBuffer.wrap(ba, offset, length);        final int readCount = this.channel.read(buffer);        //log.debug("read(a, ba, o, l) ("+attempt+") readCount : "+readCount);        if (readCount == 0)        {            Thread.currentThread().yield();            return read(attempt+1, ba, offset, length);        }        return readCount;    }    /**     * Closes this input stream (and especially the underlying channel).     */    public void close ()        throws java.io.IOException    {        //this.channel.close();            // for ed    }    //    // METHODS    //    // STATIC METHODS}