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
020package org.crsh.text;
021
022import org.crsh.shell.ScreenContext;
023
024import java.io.IOException;
025import java.util.LinkedList;
026
027public 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}