Java Reflection Annotation Find findAnnotation(final Set annotations, final Class annotationType)

Description

find Annotation

License

Apache License

Declaration

public static <T extends Annotation> Optional<T> findAnnotation(final Set<Annotation> annotations,
            final Class<T> annotationType) 

Method Source Code

//package com.java2s;
/*/*  w w  w  .j  av  a 2  s  .  com*/
 * -----------------------------------------------------------------------\
 * SilverWare
 * ?
 * Copyright (C) 2016 the original author or authors.
 * ?
 * 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.util.Optional;
import java.util.Set;

public class Main {
    public static <T extends Annotation> Optional<T> findAnnotation(final Set<Annotation> annotations,
            final Class<T> annotationType) {
        return annotations.stream().filter(annotation -> matches(annotation, annotationType)).findFirst()
                .map(annotationType::cast);
    }

    public static boolean matches(final Annotation annotation, final Class<? extends Annotation> annotationType) {
        return annotation.annotationType().isAssignableFrom(annotationType);
    }
}

Related

1. findAnnotation(final Class clazz, final Class type)
2. findAnnotation(final Class clazz, final Class annotation)
3. findAnnotation(final Class type, final Class annotationType)
4. findAnnotation(final Class targetAnnotation, final Class annotatedType)
5. findAnnotation(final Class annotationClass, final Class beanClass, final Field field)
6. findAnnotation(Method method, Class annotationType)
7. findAnnotation(Method method, Class type)
8. findAnnotation(Set annotations, Class annotationClass)
9. findAnnotationClass( Class c, Class base)