Java Reflection Method Annotation getMethodLevelAnnotations(Class clazz, Class annotation)

Description

get Method Level Annotations

License

Apache License

Declaration

public static <T extends Annotation> Set<T> getMethodLevelAnnotations(Class<?> clazz, Class<T> annotation) 

Method Source Code

//package com.java2s;
/*/*from  www .  j  av a  2s.co  m*/
 * Copyright 2008,  Unitils.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.annotation.Annotation;

import java.lang.reflect.Method;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public class Main {
    public static <T extends Annotation> Set<T> getMethodLevelAnnotations(Class<?> clazz, Class<T> annotation) {
        Set<T> result = new HashSet<T>();
        Set<Method> annotatedMethods = getMethodsAnnotatedWith(clazz, annotation);
        for (Method annotatedMethod : annotatedMethods) {
            result.add(annotatedMethod.getAnnotation(annotation));
        }
        return result;
    }

    /**
     * Returns the given class's (and superclasses) declared methods that are marked with the given annotation
     *
     * @param clazz      The class, not null
     * @param annotation The annotation, not null
     * @return A List containing methods annotated with the given annotation, empty list if none found
     */
    public static <T extends Annotation> Set<Method> getMethodsAnnotatedWith(Class<?> clazz, Class<T> annotation) {
        return getMethodsAnnotatedWith(clazz, annotation, true);
    }

    /**
     * Returns the given class's declared methods that are marked with the given annotation
     *
     * @param clazz            The class, not null
     * @param annotation       The annotation, not null
     * @param includeInherited True for also looking for methods in super-classes
     * @return A List containing methods annotated with the given annotation, empty list if none found
     */
    public static <T extends Annotation> Set<Method> getMethodsAnnotatedWith(Class<?> clazz, Class<T> annotation,
            boolean includeInherited) {
        if (Object.class.equals(clazz)) {
            return Collections.emptySet();
        }
        Set<Method> annotatedMethods = new HashSet<Method>();
        Method[] methods = clazz.getDeclaredMethods();
        for (Method method : methods) {
            if (method.getAnnotation(annotation) != null) {
                annotatedMethods.add(method);
            }
        }
        if (includeInherited) {
            annotatedMethods.addAll(getMethodsAnnotatedWith(clazz.getSuperclass(), annotation));
        }
        return annotatedMethods;
    }
}

Related

1. getMethodAnnotationMap(Method method, Collection> annotationClasses)
2. getMethodAnnotations(Method m)
3. getMethodByAnnotation(Class cls, Class annotationClass)
4. getMethodContainsAnnotations(Class target, Class annotation)
5. getMethodInClassWithAnnotation(Class cls, Class annotationClass, int... modifiers)
6. getMethodName(final Class annoType, final Class klazType)
7. getMethodOrClassLevelAnnotation(Class annotationClass, Method method, Class clazz)
8. getMethods(Annotation anno)
9. getMethods(Class clazz, Class annotation)