001    /*
002     * Copyright (C) 2010 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    
020    package org.crsh.util;
021    
022    import java.io.Closeable;
023    import java.io.IOException;
024    import java.io.Writer;
025    
026    /**
027     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
028     * @version $Revision$
029     */
030    public class AppendableWriter extends Writer {
031    
032      /** . */
033      private final Appendable out;
034    
035      /** . */
036      private boolean closed;
037    
038      public AppendableWriter(Appendable out) {
039        this.out = out;
040      }
041    
042      @Override
043      public void write(char[] cbuf, int off, int len) throws IOException {
044        if (closed) {
045          throw new IOException("Already closed");
046        }
047        int end = off + len;
048        while (off < end) {
049          out.append(cbuf[off++]);
050        }
051      }
052    
053      @Override
054      public void flush() throws IOException {
055        if (closed) {
056          throw new IOException("Already closed");
057        }
058      }
059    
060      @Override
061      public void close() throws IOException {
062        if (!closed) {
063          closed = true;
064          if (out instanceof Closeable) {
065            ((Closeable)out).close();
066          }
067        }
068      }
069    }