org.exolab.castor.xml.parsing.primitive.objects.PrimitiveEnum Maven / Gradle / Ivy
/*
* Copyright 2005 Philipp Erlacher
*
* 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.exolab.castor.xml.parsing.primitive.objects;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.commons.lang3.StringUtils;
/**
* This class is part of the command pattern implementation to instantiate an object. It is used as
* a command by the command invoker {@link PrimitiveObject}.
*
* @author Philipp Erlacher
*
*/
class PrimitiveEnum extends PrimitiveObject {
@Override
public Object getObject(Class type, String value) {
if (StringUtils.isEmpty(value)) {
return null;
}
// discover the fromValue Method
try {
Method valueOfMethod = type.getMethod("fromValue", new Class[] {String.class});
return valueOfMethod.invoke(null, new Object[] {value});
} catch (NoSuchMethodException e) {
// do nothing, check valueOf method
} catch (IllegalArgumentException e) {
throw new IllegalStateException(e.toString());
} catch (IllegalAccessException e) {
throw new IllegalStateException(e.toString());
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
}
}
// backwards compability, check valueOf method to support
// "simple" enums without value object
try {
Method valueOfMethod = type.getMethod("valueOf", new Class[] {String.class});
return valueOfMethod.invoke(null, new Object[] {value});
} catch (IllegalAccessException e) {
throw new IllegalStateException(e.toString());
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
}
} catch (NoSuchMethodException e) {
String err = type.getName() + " does not contain the required method: public static "
+ type.getName() + " valueOf(String);";
throw new IllegalArgumentException(err);
}
return value;
}
}