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/*
 * Copyright 2004-2007 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.execution;

import java.io.ObjectStreamException;
import java.io.Serializable;

/**
 * Abstract base class for value objects that provide callers into a flow execution information about a logical response
 * to issue and the data necessary to issue it.
 * 

* This class is a generic marker returned when a request into an executing flow has completed processing, indicating a * client response needs to be issued. An instance of a ViewSelection subclass represents the selection of a concrete * response type. It is expected that callers introspect the returned view selection instance to handle the response * types they support. * * @see FlowExecution * * @author Keith Donald * @author Erwin Vervaet */ public abstract class ViewSelection implements Serializable { /** * Constant for a null or empty view selection, indicating no response should be issued. */ public static final ViewSelection NULL_VIEW = new NullView(); /** * The definition of the 'null' view selection type, indicating that no response should be issued. */ private static final class NullView extends ViewSelection { // resolve the singleton instance private Object readResolve() throws ObjectStreamException { return NULL_VIEW; } public String toString() { return "null"; } } }





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