Java Reflection Annotation Find findAnnotation(Annotation[] parameterAnnotations, Class targetAnnotation)

Description

Utility method to find if an annotation type is present in an array of annotations.

License

Apache License

Parameter

Parameter	Description
parameterAnnotations	the array of annotations we will look in.
targetAnnotation	the type of annotation we are looking for.

Return

the first occurrence of the targetAnnotation found in the array, null if no occurrence was found.

Declaration

public static <T extends Annotation> T findAnnotation(Annotation[] parameterAnnotations,
        Class<T> targetAnnotation) 

Method Source Code

//package com.java2s;
/**/*from  w ww  .j  a va 2  s  . c o  m*/
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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;

public class Main {
    /**
     * Utility method to find if an annotation type is present in an array of annotations.
     *
     * @param parameterAnnotations
     *            the array of annotations we will look in.
     * @param targetAnnotation
     *            the type of annotation we are looking for.
     * @return the first occurrence of the targetAnnotation found in the array, null if no
     *         occurrence was found.
     */
    public static <T extends Annotation> T findAnnotation(Annotation[] parameterAnnotations,
            Class<T> targetAnnotation) {

        for (int i = 0; i < parameterAnnotations.length; i++) {
            Annotation annotation = parameterAnnotations[i];

            if (targetAnnotation.isInstance(annotation))
                return targetAnnotation.cast(annotation);
        }

        return null;
    }
}

Related

1. findAnnotation(AnnotatedElement annotated, Class annotationClass)
2. findAnnotation(AnnotatedElement annotatedElement, Class annotationClass)
3. findAnnotation(AnnotatedElement annotatedElement, Class annotationType)
4. findAnnotation(AnnotatedElement element, Class annotationType)
5. findAnnotation(Annotation parentAnnotation, Class annotationType)
6. findAnnotation(Annotation[] searchList, Class annotation)
7. findAnnotation(Class clazz, Class annotationType)
8. findAnnotation(Class clazz, Class annotationType)
9. findAnnotation(Class aClass, Class annotationClass)