001    /**
002     * ========================================
003     * JFreeReport : a free Java report library
004     * ========================================
005     *
006     * Project Info:  http://reporting.pentaho.org/
007     *
008     * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009     *
010     * This library is free software; you can redistribute it and/or modify it under the terms
011     * of the GNU Lesser General Public License as published by the Free Software Foundation;
012     * either version 2.1 of the License, or (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016     * See the GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public License along with this
019     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020     * Boston, MA 02111-1307, USA.
021     *
022     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023     * in the United States and other countries.]
024     *
025     * ------------
026     * $Id: NoCloseOutputStream.java 2725 2007-04-01 18:49:29Z taqua $
027     * ------------
028     * (C) Copyright 2000-2005, by Object Refinery Limited.
029     * (C) Copyright 2005-2007, by Pentaho Corporation.
030     */
031    package org.jfree.report.util;
032    
033    import java.io.FilterOutputStream;
034    import java.io.IOException;
035    import java.io.OutputStream;
036    
037    /**
038     * A Wrapper stream that does never calls close on its parent. This implementation is
039     * needed when creating ZipOutputStream, as the final ZipDirectory is written when close
040     * is called on the ZipOutputSteam.
041     *
042     * @author Thomas Morgner
043     */
044    public class NoCloseOutputStream extends FilterOutputStream
045    {
046      /**
047       * Create a new NoCloseOutputStream with the given output stream a parent.
048       *
049       * @param out the parent stream
050       */
051      public NoCloseOutputStream (final OutputStream out)
052      {
053        super(out);
054        if (out == null)
055        {
056          throw new NullPointerException("Given Output Stream is null!");
057        }
058      }
059    
060      /**
061       * Closes this output stream and releases any system resources associated with the
062       * stream, but does not close the underlying output stream.
063       * <p/>
064       * The <code>close</code> method of <code>FilterOutputStream</code> calls its
065       * <code>flush</code> method.
066       *
067       * @throws IOException if an I/O error occurs.
068       * @see FilterOutputStream#flush()
069       * @see FilterOutputStream#out
070       */
071      public void close ()
072              throws IOException
073      {
074        flush();
075        // do not close the parent stream ... !
076      }
077    }