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.shell.ScreenContext;
023    
024    import java.io.IOException;
025    import java.util.LinkedList;
026    
027    public class ChunkAdapter implements ScreenContext {
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(ScreenContext out) {
039        this.out = new RenderAppendable(out);
040      }
041    
042      public int getWidth() {
043        return out.getWidth();
044      }
045    
046      public int getHeight() {
047        return out.getHeight();
048      }
049    
050      public Class<Object> getConsumedType() {
051        return Object.class;
052      }
053    
054      public void write(Chunk chunk) throws IOException {
055        provide(chunk);
056      }
057    
058      public void provide(Object element) throws IOException {
059        Renderable current = Renderable.getRenderable(element.getClass());
060        if (current == null) {
061          send();
062          if (element instanceof Chunk) {
063            out.write((Chunk)element);
064          } else {
065            out.write(Text.create(element.toString()));
066          }
067        } else {
068          if (renderable != null && !current.equals(renderable)) {
069            send();
070          }
071          buffer.addLast(element);
072          renderable = current;
073        }
074      }
075    
076      public void flush() throws IOException {
077        send();
078        out.flush();
079      }
080    
081      public void send() throws IOException {
082        if (buffer.size() > 0) {
083          Renderer renderer = renderable.renderer(buffer.iterator());
084          renderer.render(out);
085          buffer.clear();
086          renderable = null;
087        }
088      }
089    }