/*
* Copyright Terracotta, Inc.
*
* 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.ehcache.xml;
import javax.xml.bind.annotation.XmlElement;
import java.lang.reflect.Field;
/**
* @author Ludovic Orban
*/
final class JaxbHelper {
public static String findDefaultValue(Object jaxbObject, String fieldName) {
Field declaredField = null;
Class<?> clazz = jaxbObject.getClass();
while (true) {
try {
declaredField = clazz.getDeclaredField(fieldName);
break;
} catch (NoSuchFieldException nsfe) {
clazz = clazz.getSuperclass();
if (clazz.equals(Object.class)) {
break;
}
}
}
if (declaredField == null) {
throw new IllegalArgumentException("No such field '" + fieldName + "' in JAXB class " + jaxbObject.getClass().getName());
}
XmlElement annotation = declaredField.getAnnotation(XmlElement.class);
return annotation != null ? annotation.defaultValue() : null;
}
}