Java Reflection Annotation Find findAnnotationDeclaringClass(Class annotationType, Class classToFind)

Description

find Annotation Declaring Class

License

Apache License

Declaration

public static Class<?> findAnnotationDeclaringClass(Class<? extends Annotation> annotationType,
            Class<?> classToFind) 

Method Source Code

//package com.java2s;
/**/*from w  ww  . j a v  a2s  .  com*/
 *
 *     Copyright (C) norad.fr
 *
 *     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.AnnotatedElement;

public class Main {
    public static Class<?> findAnnotationDeclaringClass(Class<? extends Annotation> annotationType,
            Class<?> classToFind) {
        if (hasAnnotation(annotationType, classToFind)) {
            return classToFind;
        }
        Class clazz = classToFind;
        while (clazz != null && (clazz.getSuperclass() != null || clazz.getInterfaces().length > 0)) {
            if (hasAnnotation(annotationType, clazz.getSuperclass())) {
                return clazz.getSuperclass();
            }
            Class<?>[] interfaces = clazz.getInterfaces();
            if (interfaces.length > 0) {
                for (Class declaringInterface : interfaces) {
                    if (hasAnnotation(annotationType, declaringInterface)) {
                        return declaringInterface;
                    }
                }
            }
            clazz = clazz.getSuperclass();
        }
        return null;
    }

    private static boolean hasAnnotation(Class annotationType, Class clazz) {
        return (clazz != null && getAnnotation(clazz, annotationType) != null);
        //        return (clazz != null && clazz.getAnnotation(annotationType) != null);
    }

    public static <T extends Annotation> T getAnnotation(AnnotatedElement ae, Class<T> annotationType) {
        T ann = ae.getAnnotation(annotationType);
        if (ann == null) {
            for (Annotation metaAnn : ae.getAnnotations()) {
                ann = metaAnn.annotationType().getAnnotation(annotationType);
                if (ann != null) {
                    break;
                }
            }
        }
        return ann;
    }
}

Related

1. findAnnotation(Method method, Class annotationType)
2. findAnnotation(Method method, Class type)
3. findAnnotation(Set annotations, Class annotationClass)
4. findAnnotationClass( Class c, Class base)
5. findAnnotationDeclaringClass(Class annotationType, Class clazz)
6. findAnnotationDeclaringClass(Class annotationType, Class clazz)
7. findAnnotationFromClass(Class target, Class annotation)
8. findAnnotationFromMethodOrClass(final Method method, final Class annotationClass)
9. findAnnotationHelper( Class base, Type iface)