Java Reflection Annotation getAnnotationField(Annotation annotation, String field)

Description

Access to the value of a field in an annotation using reflection.

License

Apache License

Parameter

Parameter	Description
annotation	the annotation object
field	the name of the field. In fact implemented as a method.

Return

object. The result must then be coerced.

Declaration

public static Object getAnnotationField(Annotation annotation,
        String field) 

Method Source Code

//package com.java2s;
/*/*from  w w  w  . j  a v a2 s  . c  o m*/
 * #%L
 * Matos
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2008 - 2014 Orange SA
 * %%
 * 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.
 * #L%
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

public class Main {
    /**
     * Access to the value of a field in an annotation using reflection.
     * @param annotation the annotation object
     * @param field the name of the field. In fact implemented as a method.
     * @return object. The result must then be coerced.
     */

    public static Object getAnnotationField(Annotation annotation,
            String field) {
        Class<?> annotClass = annotation.getClass();
        try {
            Method getValue = annotClass.getMethod(field);
            return getValue.invoke(annotation);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

Related

1. getAnnotationClass(String name)
2. getAnnotationDeep(Annotation from, Class toFind)
3. getAnnotationDefault(Class annotationClass, String element)
4. getAnnotationDefaultMap(Class annotationClass)
5. getAnnotationElementValue(AnnotatedElement annotatedElement, String annotationClassName, String annotationElementName, Class annotationElementType)
6. getAnnotationFields(Class claz, Class annotationType)
7. getAnnotationFields(Class clazz, Class annotationClass)
8. getAnnotationForMethodOrContainingClass(Method m, Class annotationType)
9. getAnnotationForProperty(Class cls, String name, Class anno)