ReflectionUtil.java

/*
 * Created by LuaView.
 * Copyright (c) 2017, Alibaba Group. All rights reserved.
 *
 * This source code is licensed under the MIT.
 * For the full copyright and license information,please view the LICENSE file in the root directory of this source tree.
 */

package com.taobao.luaview.util;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * 反射相关类封装
 *
 * @author song
 * @date 15/8/18
 * 下午4:39 song XXX
 */
public class ReflectionUtil {

    /**
     * get methods of given annotation
     *
     * @param type
     * @param annotation
     * @return
     */
    public static List<Method> getMethodsAnnotatedWith(final Class<?> type, final Class<? extends Annotation> annotation) {
        final List<Method> methods = new ArrayList<Method>();
        Class<?> klass = type;
        while (klass != Object.class) { // need to iterated thought hierarchy in order to retrieve methods from above the current instance
            // iterate though the list of methods declared in the class represented by klass variable, and add those annotated with the specified annotation
            final List<Method> allMethods = new ArrayList<Method>(Arrays.asList(klass.getDeclaredMethods()));
            for (final Method method : allMethods) {
                if (annotation == null || method.isAnnotationPresent(annotation)) {
                    Annotation annotInstance = method.getAnnotation(annotation);
                    // TODO process annotInstance
                    methods.add(method);
                }
            }
            // move to the upper class in the hierarchy in search for more methods
            klass = klass.getSuperclass();
        }
        return methods;
    }
}