/
AnnotationUtil.java
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/
AnnotationUtil.java
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/*
* Copyright 2012-2024 CodeLibs Project and the Others.
*
* 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 org.codelibs.core.lang;
import static org.codelibs.core.collection.CollectionsUtil.newHashMap;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;
import java.lang.annotation.Annotation;
import java.util.Map;
import org.codelibs.core.beans.BeanDesc;
import org.codelibs.core.beans.MethodDesc;
import org.codelibs.core.beans.factory.BeanDescFactory;
/**
* アノテーションのためのユーティリティクラスです。
*
* @author higa
*/
public abstract class AnnotationUtil {
/**
* アノテーションの要素を名前と値の{@link Map}として返します。
*
* @param annotation
* アノテーション。{@literal null}であってはいけません
* @return アノテーションの要素の名前と値からなる{@link Map}
*/
public static Map<String, Object> getProperties(final Annotation annotation) {
assertArgumentNotNull("annotation", annotation);
final Map<String, Object> map = newHashMap();
final BeanDesc beanDesc = BeanDescFactory.getBeanDesc(annotation.annotationType());
for (final String name : beanDesc.getMethodNames()) {
final Object v = getProperty(beanDesc, annotation, name);
if (v != null) {
map.put(name, v);
}
}
return map;
}
/**
* アノテーションの要素の値を返します。
*
* @param beanDesc
* アノテーションを表す{@link BeanDesc}
* @param annotation
* アノテーション
* @param name
* 要素の名前
* @return アノテーションの要素の値
*/
protected static Object getProperty(final BeanDesc beanDesc, final Annotation annotation, final String name) {
final MethodDesc methodDesc = beanDesc.getMethodDescNoException(name);
if (methodDesc == null) {
return null;
}
final Object value = methodDesc.invoke(annotation);
if (value == null || "".equals(value)) {
return null;
}
return value;
}
}