Example usage for java.lang Class getDeclaredAnnotationsByType

Introduction

In this page you can find the example usage for java.lang Class getDeclaredAnnotationsByType.

Prototype

@Override
public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) 

Source Link

Usage

From source file:com.github.helenusdriver.commons.lang3.reflect.ReflectionUtils.java

/**
 * Finds the first class from a given class' hierarchy that is not annotated
 * with the specified annotation.//from www .  j  ava2 s. com
 *
 * @author paouelle
 *
 * @param <T> the type of the class t start searching from
 *
 * @param  clazz the class from which to search
 * @param  annotationClass the annotation to search for
 * @return the non-<code>null</code> first class in <code>clazz</code>'s
 *         hierarchy not annotated with the specified annotation
 * @throws NullPointerException if <code>clazz</code> or
 *         <code>annotationClass</code> is <code>null</code>
 */
public static <T> Class<? super T> findFirstClassNotAnnotatedWith(Class<T> clazz,
        Class<? extends Annotation> annotationClass) {
    org.apache.commons.lang3.Validate.notNull(clazz, "invalid null class");
    org.apache.commons.lang3.Validate.notNull(annotationClass, "invalid null annotation class");
    Class<? super T> c = clazz;

    while (c.getDeclaredAnnotationsByType(annotationClass).length > 0) {
        c = c.getSuperclass();
    }
    return c;
}

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From source file:com.github.helenusdriver.commons.lang3.reflect.ReflectionUtils.java

/**
 * Finds the first class from a given class' hierarchy that is annotated
 * with the specified annotation./*  ww w.  ja  v a2  s . co m*/
 *
 * @author paouelle
 *
 * @param <T> the type of the class to start searching from
 *
 * @param  clazz the class from which to search
 * @param  annotationClass the annotation to search for
 * @return the first class in <code>clazz</code>'s hierarchy annotated with
 *         the specified annotation or <code>null</code> if none is found
 * @throws NullPointerException if <code>clazz</code> or
 *         <code>annotationClass</code> is <code>null</code>
 */
public static <T> Class<? super T> findFirstClassAnnotatedWith(Class<T> clazz,
        Class<? extends Annotation> annotationClass) {
    org.apache.commons.lang3.Validate.notNull(clazz, "invalid null class");
    org.apache.commons.lang3.Validate.notNull(annotationClass, "invalid null annotation class");
    Class<? super T> c = clazz;

    do {
        if (c.getDeclaredAnnotationsByType(annotationClass).length > 0) {
            return c;
        }
        c = c.getSuperclass();
    } while (c != null);
    return null;
}

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