Java Reflection Annotation getAnnotation(Class clazz, Class annotationClass)

Description

get Annotation

License

Apache License

Declaration

public static <T extends Annotation> T getAnnotation(Class<?> clazz,
            Class<T> annotationClass) 

Method Source Code

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

import java.lang.annotation.Annotation;
import java.lang.annotation.Inherited;

import java.lang.reflect.Method;

public class Main {

    public static <T extends Annotation> T getAnnotation(Method method,
            Class<T> annotationClass) {
        T t = getAnnotation(method, annotationClass,
                annotationClass.isAnnotationPresent(Inherited.class));
        return t;
    }//from w w w.  j  av a2s . c  o  m

    public static <T extends Annotation> T getAnnotation(Class<?> clazz,
            Class<T> annotationClass) {
        T t = clazz.getAnnotation(annotationClass);
        return t;
    }

    private static <T extends Annotation> T getAnnotation(Method method,
            Class<T> annotationClass, boolean seekSuper) {
        T t = method.getAnnotation(annotationClass);
        if (t == null && seekSuper) {
            Class<?> clazz = method.getDeclaringClass().getSuperclass();
            if (clazz != null) {
                try {
                    method = clazz.getMethod(method.getName(),
                            method.getParameterTypes());
                    t = getAnnotation(method, annotationClass, true);
                } catch (NoSuchMethodException e) {

                }
            }
        }
        return t;
    }

    private static boolean isAnnotationPresent(boolean isAll,
            Class<?> clazz,
            Class<? extends Annotation>... annotationClasses) {
        for (Class c : annotationClasses) {
            if (clazz.isAnnotationPresent(c)) {
                if (!isAll) {
                    return true;
                }
            } else if (isAll) {
                return false;
            }
        }
        return isAll;
    }

    private static boolean isAnnotationPresent(boolean isAll,
            Method method, Class<? extends Annotation>... annotationClasses) {
        for (Class c : annotationClasses) {
            if (method.isAnnotationPresent(c)) {
                if (!isAll) {
                    return true;
                }
            } else if (isAll) {
                return false;
            }
        }
        return isAll;
    }
}

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