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.text.ui.LabelElement;
023
024 import java.util.ArrayList;
025 import java.util.Iterator;
026 import java.util.ServiceConfigurationError;
027 import java.util.ServiceLoader;
028
029 /**
030 * Provide a renderable.
031 */
032 public abstract class Renderable<E> {
033
034 /** . */
035 private static final Renderable<?>[] renderables;
036
037 static {
038 ArrayList<Renderable<?>> tmp = new ArrayList<Renderable<?>>();
039 Iterator<Renderable> i = ServiceLoader.load(Renderable.class).iterator();
040 while (i.hasNext()) {
041 try {
042 Renderable renderable = i.next();
043 tmp.add(renderable);
044 }
045 catch (ServiceConfigurationError e) {
046 // Config error
047 }
048 }
049 renderables = tmp.toArray(new Renderable<?>[tmp.size()]);
050 }
051
052 public static Renderable<Object> ANY = new Renderable<Object>() {
053 @Override
054 public Class<Object> getType() {
055 return Object.class;
056 }
057
058 @Override
059 public Renderer renderer(Iterator<Object> stream) {
060 StringBuilder sb = new StringBuilder();
061 while (stream.hasNext()) {
062 Object next = stream.next();
063 if (next instanceof Chunk) {
064 if (next instanceof Text) {
065 sb.append(((Text)next).buffer);
066 }
067 } else {
068 sb.append(next);
069 }
070 }
071 return new LabelElement(sb.toString()).renderer();
072 }
073 };
074
075 public static <I> Renderable<? super I> getRenderable(Class<I> itemType) {
076 for (Renderable<?> formatter : renderables) {
077 if (formatter.getType().isAssignableFrom(itemType)) {
078 return (Renderable<I>)formatter;
079 }
080 }
081 return null;
082 }
083
084 public abstract Class<E> getType();
085
086 public abstract Renderer renderer(Iterator<E> stream);
087
088 }