Java Reflection Annotation getAnnotation(final AnnotatedElement annotatedElement, final Class annotationClass)

License

Declaration

public static <A extends Annotation> A getAnnotation(final AnnotatedElement annotatedElement,
        final Class<A> annotationClass) 

Method Source Code

//package com.java2s;
/*/*from   www  .j a v a2s  . c  o m*/
 * Copyright (C) 2015 Sebastian Daschner, sebastian-daschner.com
 *
 * 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/LICENSE2.0
 *
 * 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;

import java.util.*;

import java.util.stream.Stream;

public class Main {
    /**
     * Returns the annotation or {@code null} if the element is not annotated with that type.
     * <b>Note:</b> This step is necessary due to issues with external class loaders (e.g. Maven).
     * The classes may not be identical and are therefore compared by FQ class name.
     */
    public static <A extends Annotation> A getAnnotation(final AnnotatedElement annotatedElement,
            final Class<A> annotationClass) {
        final Optional<Annotation> annotation = Stream.of(annotatedElement.getAnnotations())
                .filter(a -> a.annotationType().getName().equals(annotationClass.getName())).findAny();
        return (A) annotation.orElse(null);
    }
}

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