Java Reflection Annotation Find findAnnotation(final Class targetAnnotation, final Class annotatedType)

License

Declaration

static <A extends Annotation> A findAnnotation(final Class<A> targetAnnotation, final Class<?> annotatedType) 

Method Source Code

//package com.java2s;
/**//from w ww .j a v a 2 s.  c  om
 * The MIT License
 *
 *  Copyright (c) 2017, Mahmoud Ben Hassine (mahmoud.benhassine@icloud.com)
 *
 *  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;

public class Main {
    static <A extends Annotation> A findAnnotation(final Class<A> targetAnnotation, final Class<?> annotatedType) {

        A foundAnnotation = annotatedType.getAnnotation(targetAnnotation);
        if (foundAnnotation == null) {
            for (Annotation annotation : annotatedType.getAnnotations()) {
                Class<? extends Annotation> annotationType = annotation.annotationType();
                if (annotationType.isAnnotationPresent(targetAnnotation)) {
                    foundAnnotation = annotationType.getAnnotation(targetAnnotation);
                    break;
                }
            }
        }
        return foundAnnotation;
    }

    static boolean isAnnotationPresent(final Class<? extends Annotation> targetAnnotation,
            final Class<?> annotatedType) {
        return findAnnotation(targetAnnotation, annotatedType) != null;
    }
}

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