org.springframework.webflow.engine.support.SimpleFlowVariable 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.engine.support;
import java.lang.reflect.Modifier;
import org.springframework.beans.BeanUtils;
import org.springframework.util.Assert;
import org.springframework.webflow.engine.FlowVariable;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.ScopeType;
/**
* A trivial concrete flow variable subclass that creates new variable values
* using Java reflection.
*
* @author Keith Donald
*/
public class SimpleFlowVariable extends FlowVariable {
/**
* The concrete variable value class.
*/
private Class variableClass;
/**
* Creates a new simple flow variable.
* @param name the variable name
* @param variableClass the concrete variable class
* @param scope the variable scope
*/
public SimpleFlowVariable(String name, Class variableClass, ScopeType scope) {
super(name, scope);
Assert.notNull(variableClass, "The variable class is required");
Assert.isTrue(!variableClass.isInterface(), "The variable class cannot be an interface");
Assert.isTrue(!Modifier.isAbstract(variableClass.getModifiers()), "The variable class cannot be abstract");
this.variableClass = variableClass;
}
/**
* Returns the variable value class.
*/
public Class getVariableClass() {
return variableClass;
}
protected Object createVariableValue(RequestContext context) {
return BeanUtils.instantiateClass(variableClass);
}
}