Java Reflection Annotation Find findAnnotation(Class clazz, Class annotationType)

Description

Look for the annotationType in the class or one of its ancestors.

License

LGPL

Parameter

Parameter	Description
clazz	The class to scan.
annotationType	The annotation type to find.

Return

The annotation, null if not found.

Declaration

public static <T extends Annotation> T findAnnotation(Class<?> clazz, Class<T> annotationType) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.lang.annotation.Annotation;

public class Main {
    /**/*from   w  w  w  .j a v  a2s . co  m*/
     * Look for the annotationType in the class or one of its ancestors.
     *
     * @param clazz          The class to scan.
     * @param annotationType The annotation type to find.
     * @return The annotation, null if not found.
     */
    public static <T extends Annotation> T findAnnotation(Class<?> clazz, Class<T> annotationType) {
        T a = clazz.getAnnotation(annotationType);
        if (a != null) {
            return a;
        }

        Class<?> parentClass = clazz.getSuperclass();
        if (parentClass != null && !parentClass.equals(Object.class)) {
            a = findAnnotation(parentClass, annotationType);
        }

        if (a == null) {
            for (Class<?> i : clazz.getInterfaces()) {
                a = findAnnotation(i, annotationType);
                if (a != null) {
                    return a;
                }
            }
        }

        return a;
    }
}

Related

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9. findAnnotation(final Class type, final Class annotationType)