Java Reflection Annotation Find findAnnotationHelper( Class base, Type iface)

Description

find Annotation Helper

License

Open Source License

Declaration

@SuppressWarnings("unchecked")
    private static Class<? extends Annotation> findAnnotationHelper(
            Class<?> base, Type iface) 

Method Source Code

//package com.java2s;
/*/*from   w w w  . j  a v  a2  s . c  o m*/
 * Copyright (C) 2009-2011 The Project Lombok Authors.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class Main {
    @SuppressWarnings("unchecked")
    private static Class<? extends Annotation> findAnnotationHelper(
            Class<?> base, Type iface) {
        if (iface instanceof ParameterizedType) {
            ParameterizedType p = (ParameterizedType) iface;
            if (!base.equals(p.getRawType()))
                return null;
            Type target = p.getActualTypeArguments()[0];
            if (target instanceof Class<?>) {
                if (Annotation.class.isAssignableFrom((Class<?>) target)) {
                    return (Class<? extends Annotation>) target;
                }
            }

            throw new ClassCastException("Not an annotation type: "
                    + target);
        }
        return null;
    }
}

Related

1. findAnnotationDeclaringClass(Class annotationType, Class clazz)
2. findAnnotationDeclaringClass(Class annotationType, Class classToFind)
3. findAnnotationDeclaringClass(Class annotationType, Class clazz)
4. findAnnotationFromClass(Class target, Class annotation)
5. findAnnotationFromMethodOrClass(final Method method, final Class annotationClass)
6. findAnnotationIn(List modifiers, Class clazz)
7. findAnnotationInAnnotations(AnnotatedElement annotatedElement, Class annotationClass)
8. findAnnotationInAnyParameter(Method method, Class annotationClass)
9. findAnnotationInMethodOrInItsAnnotations(Method method, Class annotationClass)