org.springframework.webflow.action.ResultEventFactorySelector Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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.springframework.webflow.action;
import java.lang.reflect.Method;
/**
* Helper that selects the {@link ResultEventFactory} to use for
* a particular result object.
*
* @see EvaluateAction
* @see BeanInvokingActionFactory
*
* @author Keith Donald
*/
public class ResultEventFactorySelector {
/**
* The event factory instance for mapping a return value to a success event.
*/
private SuccessEventFactory successEventFactory = new SuccessEventFactory();
/**
* The event factory instance for mapping a result object to an event, using
* the type of the result object as the mapping criteria.
*/
private ResultObjectBasedEventFactory resultObjectBasedEventFactory = new ResultObjectBasedEventFactory();
/**
* Select the appropriate result event factory for attempts to invoke the
* given method.
* @param method the method
* @return the result event factory
*/
public ResultEventFactory forMethod(Method method) {
return forType(method.getReturnType());
}
/**
* Select the appropriate result event factory for the given result.
* @param result the result
* @return the result event factory
*/
public ResultEventFactory forResult(Object result) {
if (result == null) {
return successEventFactory;
}
else {
return forType(result.getClass());
}
}
/**
* Select the appropriate result event factory for given result type.
* This implementation returns {@link ResultObjectBasedEventFactory} if the
* type is {@link ResultObjectBasedEventFactory#isMappedValueType(Class) mapped}
* by that result event factory, otherwise {@link SuccessEventFactory} is
* returned.
* @param resultType the result type
* @return the result event factory
*/
protected ResultEventFactory forType(Class resultType) {
if (resultObjectBasedEventFactory.isMappedValueType(resultType)) {
return resultObjectBasedEventFactory;
}
else {
return successEventFactory;
}
}
}