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.io.Consumer;
023import org.crsh.shell.ScreenContext;
024
025import java.io.IOException;
026import java.util.LinkedList;
027
028/**
029 * A <code>Consumer&lt;Object&gt;</code> that renders the object stream to a {@link org.crsh.shell.ScreenContext}.
030 */
031public class ChunkAdapter implements Consumer<Object> {
032
033  /** Buffers objects of the same kind. */
034  private final LinkedList<Object> buffer = new LinkedList<Object>();
035
036  /** . */
037  private Renderer renderable = null;
038
039  /** . */
040  private final RenderAppendable out;
041
042  public ChunkAdapter(ScreenContext out) {
043    this.out = new RenderAppendable(out);
044  }
045
046  public Class<Object> getConsumedType() {
047    return Object.class;
048  }
049
050  public void provide(Object element) throws IOException {
051    Renderer current = Renderer.getRenderable(element.getClass());
052    if (current == null) {
053      send();
054      if (element instanceof Chunk) {
055        out.write((Chunk)element);
056      } else {
057        out.write(Text.create(element.toString()));
058      }
059    } else {
060      if (renderable != null && !current.equals(renderable)) {
061        send();
062      }
063      buffer.addLast(element);
064      renderable = current;
065    }
066  }
067
068  public void flush() throws IOException {
069    send();
070    out.flush();
071  }
072
073  public void send() throws IOException {
074    if (buffer.size() > 0) {
075      LineRenderer renderer = renderable.renderer(buffer.iterator());
076      renderer.render(out);
077      buffer.clear();
078      renderable = null;
079    }
080  }
081}