validate Is Annotation Type - Java java.lang.annotation

Java examples for java.lang.annotation:Annotation Type

  1. HOME
  2. Java
  3. java.lang.annotation
  4. Annotation Type

Description

validate Is Annotation Type

Demo Code

/*//from w ww .j av a 2 s .co  m
 * Copyright (c) 2008 Kasper Nielsen.
 *
 * 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.
 */
//package com.java2s;
import static java.util.Objects.requireNonNull;
import java.lang.annotation.Annotation;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class annotationType = String.class;
        System.out.println(validateIsAnnotationType(annotationType));
    }

    public static <T> Class<T> validateIsAnnotationType(
            Class<T> annotationType) {
        requireNonNull(annotationType, "annotationType is null");
        if (!Annotation.class.isAssignableFrom(annotationType)) {
            throw new IllegalArgumentException(
                    "Specified annotation type @"
                            + annotationType.getSimpleName()
                            + "is not an annotation, type = "
                            + annotationType);
        }
        return annotationType;
    }
}

Related Tutorials