001/* 002 * (C) Copyright 2006-2008 Nuxeo SAS (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library 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 * Contributors: 015 * bstefanescu 016 * 017 * $Id$ 018 */ 019 020package org.nuxeo.runtime.annotations; 021 022import java.lang.annotation.Annotation; 023import java.util.Map; 024import java.util.concurrent.ConcurrentHashMap; 025 026/** 027 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> 028 */ 029@SuppressWarnings("unchecked") 030public class AnnotationManager { 031 032 protected Map<Class<?>, AnnotatedClass<?>> classCache; 033 034 public AnnotationManager() { 035 classCache = createCache(); 036 } 037 038 protected Map<Class<?>, AnnotatedClass<?>> createCache() { 039 return new ConcurrentHashMap<Class<?>, AnnotatedClass<?>>(); 040 } 041 042 public void flushCache() { 043 classCache = createCache(); 044 } 045 046 public <T> AnnotatedClass<T> getAnnotatedClass(Class<T> clazz) { 047 // use a local variable to avoid problem when flushing cache 048 // in another thread while this method is executing 049 Map<Class<?>, AnnotatedClass<?>> cache = classCache; 050 AnnotatedClass<T> aclass = (AnnotatedClass<T>) cache.get(clazz); 051 if (aclass == null) { 052 aclass = load(clazz); 053 cache.put(clazz, aclass); 054 } 055 return aclass; 056 } 057 058 public <T> AnnotatedClass<T> lookup(Class<T> clazz) { 059 return (AnnotatedClass<T>) classCache.get(clazz); 060 } 061 062 public <T> AnnotatedClass<T> load(Class<T> clazz) { 063 AnnotatedClass<T> aclass = new AnnotatedClass<T>(clazz); 064 Class<?> zuper = clazz.getSuperclass(); 065 MethodAnnotations mannos = new MethodAnnotations(); 066 067 // collect super class annotations 068 if (zuper != null) { 069 AnnotatedClass<?> azuper = getAnnotatedClass(zuper); 070 aclass.annotations.putAll(azuper.annotations); 071 for (AnnotatedMethod am : azuper.getAnnotatedMethods()) { 072 mannos.addSuperMethod(am); 073 } 074 } 075 076 // collect interface annotations 077 for (Class<?> itf : clazz.getInterfaces()) { 078 AnnotatedClass<?> aitf = getAnnotatedClass(itf); 079 aclass.annotations.putAll(aitf.annotations); 080 for (AnnotatedMethod am : aitf.getAnnotatedMethods()) { 081 mannos.addSuperMethod(am); 082 } 083 } 084 085 // finally add class own annotations 086 mannos.addMethods(clazz); 087 for (Annotation anno : clazz.getAnnotations()) { 088 aclass.annotations.put(anno.annotationType(), anno); 089 } 090 091 // create annotated methods from collected methods 092 for (MethodAnnotations.Entry entry : mannos.entries) { 093 AnnotatedMethod am = new AnnotatedMethod(aclass, entry.method, entry.annos); 094 aclass.addMethod(am); 095 } 096 return aclass; 097 } 098 099}