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 Renderer<E> { 033 034 /** . */ 035 private static final Renderer<?>[] renderables; 036 037 static { 038 ArrayList<Renderer<?>> tmp = new ArrayList<Renderer<?>>(); 039 Iterator<Renderer> i = ServiceLoader.load(Renderer.class).iterator(); 040 while (i.hasNext()) { 041 try { 042 Renderer renderable = i.next(); 043 tmp.add(renderable); 044 } 045 catch (ServiceConfigurationError e) { 046 // Config error 047 } 048 } 049 renderables = tmp.toArray(new Renderer<?>[tmp.size()]); 050 } 051 052 public static Renderer<Object> ANY = new Renderer<Object>() { 053 @Override 054 public Class<Object> getType() { 055 return Object.class; 056 } 057 058 @Override 059 public LineRenderer renderer(Iterator<Object> stream) { 060 StringBuilder sb = new StringBuilder(); 061 while (stream.hasNext()) { 062 Object next = stream.next(); 063 if (next instanceof CharSequence) { 064 sb.append((CharSequence)next); 065 } else { 066 sb.append(next); 067 } 068 } 069 return new LabelElement(sb.toString()).renderer(); 070 } 071 }; 072 073 public static <I> Renderer<? super I> getRenderable(Class<I> itemType) { 074 for (Renderer<?> formatter : renderables) { 075 try { 076 if (formatter.getType().isAssignableFrom(itemType)) { 077 return (Renderer<I>)formatter; 078 } 079 } 080 catch (Exception e) { 081 } 082 catch (NoClassDefFoundError e) { 083 } 084 } 085 return null; 086 } 087 088 public abstract Class<E> getType(); 089 090 public abstract LineRenderer renderer(Iterator<E> stream); 091 092 }