org.springframework.webflow.execution.support.FlowExecutionRedirect 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.execution.support;
import java.io.ObjectStreamException;
import org.springframework.webflow.engine.ViewState;
import org.springframework.webflow.execution.ViewSelection;
/**
* Concrete response type that refreshes an application view by redirecting
* to an existing, active Spring Web Flow execution at a unique
* SWF-specific flow execution URL. This enables the triggering of
* post-redirect-get semantics from within an active flow execution.
*
* Once the redirect response is issued a new request is initiated by the
* browser targeted at the flow execution URL. The URL is stabally refreshable
* (and bookmarkable) while the conversation remains active, safely triggering a
* {@link ViewState#refresh(org.springframework.webflow.execution.RequestContext)}
* on each access.
*
* @author Keith Donald
* @author Erwin Vervaet
*/
public final class FlowExecutionRedirect extends ViewSelection {
/**
* The single instance of this class.
*/
public static final FlowExecutionRedirect INSTANCE = new FlowExecutionRedirect();
/**
* Avoid instantiation.
*/
private FlowExecutionRedirect() {
}
// resolve the singleton instance
private Object readResolve() throws ObjectStreamException {
return INSTANCE;
}
public String toString() {
return "redirect:";
}
}