Here you can find the source of getAnnotationMemberType(Annotation annotation, String memberName)
| Parameter | Description |
|---|---|
| annotation | a parameter |
| memberName | a parameter |
public static Class<?> getAnnotationMemberType(Annotation annotation, String memberName)
//package com.java2s; /**//from w w w .ja v a 2s. com * EKO : A Peer To Peer Application * Copyright (c) J?r?me Bonnet 2008-2009 * All Rights Reserved * * Unless you own a different specific licence for this progran, * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * * A moins que vous ne disposer d'une licence diff?rente pour ce programme, Ce programme est libre, vous pouvez le redistribuer et/ou le modifier selon les termes de * la Licence Publique G?n?rale GNU publi?e par la Free Software Foundation (version 3). * * Ce programme est distribu? car potentiellement utile, mais SANS AUCUNE GARANTIE, ni explicite ni implicite, y compris les garanties de commercialisation ou d'adaptation * dans un but sp?cifique. Reportez-vous ? la Licence Publique G?n?rale GNU pour plus de d?tails. * * Vous devez avoir re?u une copie de la Licence Publique G?n?rale GNU en m?me temps que ce programme ; si ce n'est pas le cas, ?crivez ? la Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307, ?tats-Unis. */ import java.lang.annotation.Annotation; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class Main { private static Map<Class<? extends Annotation>, Map<String, Method>> reflexionCache = new ConcurrentHashMap<Class<? extends Annotation>, Map<String, Method>>(); /** * return the type of an annotation member, or null if the member is not found in the annotation * @param annotation * @param memberName * @return */ public static Class<?> getAnnotationMemberType(Annotation annotation, String memberName) { Class<? extends Annotation> annotationType = annotation.annotationType(); return getAnnotationMemberType(annotationType, memberName); } public static Class<?> getAnnotationMemberType(Class<? extends Annotation> annotationType, String memberName) { Map<String, Method> annotationMethods = getAnnotationMethods(annotationType); Method memberMethod = annotationMethods.get(memberName); if (memberMethod == null) return null; return memberMethod.getReturnType(); } private static Map<String, Method> getAnnotationMethods(Class<? extends Annotation> annotationType) { Map<String, Method> annotationMethods = reflexionCache.get(annotationType); if (annotationMethods == null) { //Note about thread-safety: there may be 2 threads building this map but I don't care annotationMethods = new HashMap<String, Method>(); for (Method method : annotationType.getMethods()) { if (method.getParameterTypes().length == 0 && method.getReturnType().equals(Void.class) == false) { String methName = method.getName(); if (methName.equals("equals") || methName.equals("toString") || methName.equals("hashCode") || methName.equals("annotationType")) { //do nothing, this is stupid, but I prefer to write the if expression this way, it seems clearer to me } else { annotationMethods.put(methName, method); } } } reflexionCache.put(annotationType, annotationMethods); } return annotationMethods; } }