org.apache.deltaspike.core.util.AnnotationUtils Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.deltaspike.core.util;

import javax.enterprise.inject.Typed;
import javax.enterprise.inject.spi.BeanManager;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

@Typed()
public abstract class AnnotationUtils
{
    private AnnotationUtils()
    {
        // prevent instantiation
    }

    public static  T extractAnnotationFromMethodOrClass(
        BeanManager beanManager, Method targetMethod, Class targetClass, Class targetAnnotationType)
    {
        T result = extractAnnotationFromMethod(beanManager, targetMethod, targetAnnotationType);

        if (result == null)
        {
            //see DELTASPIKE-517
            Class unproxiedTargetClass = ProxyUtils.getUnproxiedClass(targetClass);

            // and if not found search on the class
            result = findAnnotation(beanManager, unproxiedTargetClass.getAnnotations(), targetAnnotationType);
        }
        return result;
    }

    public static  T extractAnnotationFromMethod(
        BeanManager beanManager, Method targetMethod, Class targetAnnotationType)
    {
        return findAnnotation(beanManager, targetMethod.getAnnotations(), targetAnnotationType);
    }

    public static   T findAnnotation(
            BeanManager beanManager, Annotation[] annotations, Class targetAnnotationType)
    {
        for (Annotation annotation : annotations)
        {
            if (targetAnnotationType.equals(annotation.annotationType()))
            {
                return (T) annotation;
            }
            if (beanManager.isStereotype(annotation.annotationType()))
            {
                T result = findAnnotation(
                        beanManager, annotation.annotationType().getAnnotations(), targetAnnotationType);
                if (result != null)
                {
                    return result;
                }
            }
        }
        return null;
    }
}