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AnnotationUtil.java
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package act.util;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed 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.
* #L%
*/
import org.osgl.$;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
public class AnnotationUtil {
public static <T extends Annotation> T declaredAnnotation(Class c, Class<T> annoClass) {
Annotation[] aa = c.getDeclaredAnnotations();
if (null == aa) {
return null;
}
for (Annotation a : aa) {
if (annoClass.isInstance(a)) {
return (T) a;
}
}
return null;
}
/**
* Returns the {@link Annotation} tagged on another annotation instance
* @param annotation the annotation instance
* @param tagClass the expected annotation class
* @param <T> the generic type of the expected annotation
* @return the annotation tagged on annotation of type `tagClass`
*/
public static <T extends Annotation> T annotation(Annotation annotation, Class<T> tagClass) {
Class<?> c = annotation.annotationType();
return c.getAnnotation(tagClass);
}
/**
* **Note** this method is deprecated. Please use {@link Annotation#annotationType} instead
*
* Returns the class of an annotation instance
* @param annotation the annotation instance
* @param <T> the generic type of the annotation
* @return the real annotation class
*/
@Deprecated
public static <T extends Annotation> Class<T> classOf(Annotation annotation) {
return (Class<T>) annotation.annotationType();
}
public static <T extends Annotation> T getAnnotation(Class<?> targetClass, Class<T> annotationClass) {
if (Object.class == targetClass) {
return null;
}
T annotation = targetClass.getAnnotation(annotationClass);
if (null != annotation) {
return annotation;
}
targetClass = targetClass.getSuperclass();
return null != targetClass ? getAnnotation(targetClass, annotationClass) : null;
}
public static Object defaultValue(Class<? extends Annotation> annoType, String methodName) {
Method method = $.getMethod(annoType, methodName);
return null == method ? null : method.getDefaultValue();
}
public static Object tryGetDefaultValue(Class<? extends Annotation> annoType, String methodName) {
try {
return defaultValue(annoType, methodName);
} catch (Exception e) {
// ignore it
return null;
}
}
}