org.wamblee.reflection.AnnotationUtils Maven / Gradle / Ivy
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/*
* Copyright 2005-2010 the original author or authors.
*
* 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.wamblee.reflection;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Utlities for working with annotations.
*
* @author Erik Brakkee
*
*/
public class AnnotationUtils {
/**
* Returns the accessor for a given annotation.
*
* @param aClass
* Class to analyse.
* @param aAnnotation
* Annotation that must be present.
* @return List of accessors. Empty list is returned if no match is found.
*/
public static List analyse(Class aClass,
Class aAnnotation) {
List result = new ArrayList();
List fields = ReflectionUtils.getAllFields(aClass);
for (Field field : fields) {
if (field.isAnnotationPresent(aAnnotation)) {
result.add(new FieldAccessor(field));
}
}
List methods = ReflectionUtils.getAllMethods(aClass,
Object.class);
for (Method method : methods) {
if (method.isAnnotationPresent(aAnnotation)) {
String setterName = null;
if (method.getName().startsWith("get")) {
setterName = method.getName().replaceFirst("get", "set");
} else if (method.getName().startsWith("is")) {
setterName = method.getName().replaceFirst("is", "set");
}
try {
Class returnType = method.getReturnType();
Method setter = method.getDeclaringClass()
.getDeclaredMethod(setterName, returnType);
result.add(new PropertyAccessor(method, setter));
} catch (NoSuchMethodException e) {
throw new RuntimeException("Error obtaining setter for " +
method.getName() + " in class " + aClass.getName(), e);
}
}
}
return result;
}
}