Returns array of annotations which annotates the given annotated element and which are annotated by given 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

Returns array of annotations which annotates the given annotated element and which are annotated by given annotation type.

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 w w  w  .jav  a2 s . com
     * Returns array of annotations which annotates the given annotated element and which are
     * annotated by given annotation type.
     *
     * @param element the annotated element.
     * @param annotatedBy the annotation type which annotates searched annotations.
     * @return The array of annotations of given element which are annotated by given annotation.
     */
    public static Annotation[] getAnnotatedAnnotations(
            AnnotatedElement element,
            Class<? extends Annotation> annotatedBy) {
        Preconditions.checkArgumentNotNull(element,
                "Annotated element cannot be null");
        Preconditions.checkArgumentNotNull(annotatedBy,
                "Annotation cannot be null");

        Annotation[] annotations = element.getAnnotations();
        List<Annotation> annotatedAnnotations = new ArrayList<Annotation>(
                annotations.length);
        for (int i = 0; i < annotations.length; i++) {
            Annotation[] annotationAnnotations = annotations[i]
                    .annotationType().getAnnotations();
            for (int j = 0; j < annotationAnnotations.length; j++) {
                Class<? extends Annotation> aType = annotationAnnotations[j]
                        .annotationType();
                if (annotatedBy.equals(aType)) {
                    annotatedAnnotations.add(annotations[i]);
                }
            }
        }

        return annotatedAnnotations.toArray(new Annotation[0]);
    }
}

Related Tutorials