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/*
 * Copyright 2004-2012 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;

import org.springframework.webflow.execution.FlowExecutionException;
import org.springframework.webflow.execution.RequestContext;

/**
 * A simple transitionable state that when entered will execute the first transition whose matching criteria evaluates
 * to true in the {@link RequestContext context} of the current request.
 * 

* A decision state is a convenient, simple way to encapsulate reusable state transition logic in one place. * * @author Keith Donald */ public class DecisionState extends TransitionableState { /** * Creates a new decision state. * @param flow the owning flow * @param stateId the state identifier (must be unique to the flow) * @throws IllegalArgumentException when this state cannot be added to given flow, e.g. because the id is not unique */ public DecisionState(Flow flow, String stateId) throws IllegalArgumentException { super(flow, stateId); } /** * Specialization of State's doEnter template method that executes behavior specific to this state type * in polymorphic fashion. *

* Simply looks up the first transition that matches the state of the context and executes it. * @param context the control context for the currently executing flow, used by this state to manipulate the flow * execution * @throws FlowExecutionException if an exception occurs in this state */ protected void doEnter(RequestControlContext context) throws FlowExecutionException { getRequiredTransition(context).execute(this, context); } }





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