Returns information whether the given annotation type annotation is annotated by given annotation type annotated By. - Java java.lang.annotation

Java examples for java.lang.annotation:Annotation Type

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

Description

Returns information whether the given annotation type annotation is annotated by given annotation type annotated By.

Demo Code


import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Main{
    /**/*from   www.j  a va 2s. c om*/
     * Returns information whether the given annotation type <code>annotation</code> is annotated by
     * given annotation type <code>annotatedBy</code>.
     *
     * @param annotation the annotation type to check.
     * @param annotatedBy the annotation type which may annotates the given annotation.
     * @return <code>true</code> if given annotation type <code>annotatedBy</code> annotates given
     *         annotation type <code>annotation</code>; <code>false</code> otherwise.
     */
    public static boolean isAnnotatedAnnotation(Annotation annotation,
            Class<? extends Annotation> annotatedBy) {
        return isAnnotatedAnnotation(
                annotation == null ? null : annotation.annotationType(),
                annotatedBy);
    }
    /**
     * Returns information whether the given annotation <code>annotation</code> is annotated by given
     * annotation type <code>annotatedBy</code>.
     *
     * @param annotation the annotation to check.
     * @param annotatedBy the annotation type which may annotates the given annotation.
     * @return <code>true</code> if given annotation type <code>annotatedBy</code> annotates given
     *         annotation <code>annotation</code>; <code>false</code> otherwise.
     */
    public static boolean isAnnotatedAnnotation(
            Class<? extends Annotation> annotation,
            Class<? extends Annotation> annotatedBy) {
        Preconditions.checkArgument(annotation != null
                && annotatedBy != null, "Annotation cannot be null");

        Annotation[] annotations = annotation.getAnnotations();
        for (Annotation a : annotations) {
            Class<? extends Annotation> aType = a.annotationType();
            if (annotatedBy.equals(aType)) {
                return true;
            }
        }

        return false;
    }
}

Related Tutorials