/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.text;
import org.crsh.stream.Consumer;
import java.io.IOException;
import java.util.LinkedList;
/**
* A <code>Consumer<Object></code> that renders the object stream to a {@link ScreenContext}.
*/
public class ScreenContextConsumer implements Consumer<Object> {
/** Buffers objects of the same kind. */
private final LinkedList<Object> buffer = new LinkedList<Object>();
/** . */
private Renderer renderable = null;
/** . */
private final RenderAppendable out;
public ScreenContextConsumer(ScreenContext out) {
this.out = new RenderAppendable(out);
}
public Class<Object> getConsumedType() {
return Object.class;
}
public void provide(Object element) throws IOException {
Renderer current = Renderer.getRenderable(element.getClass());
if (current == null) {
send();
if (element instanceof CharSequence) {
out.append((CharSequence)element);
} else if (element instanceof CLS) {
out.cls();
} else if (element instanceof Style) {
out.append((Style)element);
} else {
out.append(element.toString());
}
} else {
if (renderable != null && !current.equals(renderable)) {
send();
}
buffer.addLast(element);
renderable = current;
}
}
public void flush() throws IOException {
send();
out.flush();
}
public void send() throws IOException {
if (buffer.size() > 0) {
LineRenderer renderer = renderable.renderer(buffer.iterator());
renderer.render(out);
buffer.clear();
renderable = null;
}
}
}