/*
* Copyright 2014 astamuse company,Ltd.
*
* 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.
*
*/
package com.astamuse.asta4d.util.annotation;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class ConvertableAnnotationRetriever {
@SuppressWarnings({ "unchecked", "rawtypes" })
public static final <T extends Annotation> T retrieveAnnotation(Class<T> targetAnnotation, Annotation... annotations) {
try {
String targetName = targetAnnotation.getName();
T found = null;
ConvertableAnnotation ca;
for (Annotation annotation : annotations) {
while (true) {
if (annotation.annotationType().getName().equals(targetName)) {
found = (T) annotation;
break;
}
ca = annotation.annotationType().getAnnotation(ConvertableAnnotation.class);
if (ca == null) {
break;
} else {
AnnotationConvertor ac = ca.value().newInstance();
annotation = ac.convert(annotation);
}
}
if (found != null) {
break;
}
}
return found;
} catch (InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
*
*
* @param targetAnnotation
* @param annotations
* @return The first element in the returned list is the target annotation specified by parameter and the next is which the previous one
* be converted from
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public static final List<Annotation> retrieveAnnotationHierarchyList(Class<? extends Annotation> targetAnnotation,
Annotation... annotations) {
try {
String targetName = targetAnnotation.getName();
ConvertableAnnotation ca;
List<Annotation> list = new LinkedList<>();
for (Annotation annotation : annotations) {
list.clear();
while (true) {
list.add(annotation);
if (annotation.annotationType().getName().equals(targetName)) {
// found
break;
}
ca = annotation.annotationType().getAnnotation(ConvertableAnnotation.class);
if (ca == null) {
// not found
list.clear();
break;
} else {
AnnotationConvertor ac = ca.value().newInstance();
annotation = ac.convert(annotation);
}
}// end of while
if (!list.isEmpty()) {
break;
}
}
Collections.reverse(list);
return list;
} catch (InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}