001    /*
002     * Copyright (C) 2012 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.text;
021    
022    import org.crsh.Pipe;
023    
024    import java.io.IOException;
025    import java.util.LinkedList;
026    
027    public class ChunkAdapter implements Pipe<Object> {
028    
029      /** . */
030      private final LinkedList<Object> buffer = new LinkedList<Object>();
031    
032      /** . */
033      private Renderable renderable = null;
034    
035      /** . */
036      private final RenderAppendable out;
037    
038      public ChunkAdapter(RenderingContext out) {
039        this.out = new RenderAppendable(out);
040      }
041    
042      public void provide(Object element) throws IOException {
043        Renderable current = Renderable.getRenderable(element.getClass());
044        if (current == null) {
045          send();
046          if (element instanceof Chunk) {
047            out.provide((Chunk)element);
048          } else {
049            out.provide(new Text(element.toString()));
050          }
051        } else {
052          if (renderable != null && !current.equals(renderable)) {
053            send();
054          }
055          buffer.addLast(element);
056          renderable = current;
057        }
058      }
059    
060      public void flush() throws IOException {
061        send();
062        out.flush();
063      }
064    
065      public void send() throws IOException {
066        if (buffer.size() > 0) {
067          Renderer renderer = renderable.renderer(buffer.iterator());
068          renderer.render(out);
069          buffer.clear();
070          renderable = null;
071        }
072      }
073    }