| /* |
| * Copyright 2004-2005 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.codehaus.groovy.grails.web.pageflow; |
| |
| import groovy.lang.Closure; |
| |
| import java.lang.Exception; |
| |
| import org.codehaus.groovy.grails.web.pageflow.exceptions.InvalidClosureReturnValueException; |
| import org.springframework.util.Assert; |
| import org.springframework.webflow.Action; |
| import org.springframework.webflow.Event; |
| import org.springframework.webflow.RequestContext; |
| |
| /** |
| * <p>Wrapper class to execute a Groovy closure as a SWF actions. |
| * |
| * @author Steven Devijver |
| * @since Jul 10, 2005 |
| */ |
| public class ClosureAction implements Action { |
| |
| private Closure closure = null; |
| private String stateId = null; |
| private String flowId = null; |
| |
| public ClosureAction(String flowId, String stateId, Closure closure) { |
| super(); |
| Assert.notNull(flowId); |
| Assert.notNull(stateId); |
| Assert.notNull(closure); |
| this.flowId = flowId; |
| this.stateId = stateId; |
| this.closure = closure; |
| } |
| |
| public Event execute(RequestContext requestContext) throws Exception { |
| Object result = this.closure.call(requestContext); |
| |
| if (result == null) { |
| throw new InvalidClosureReturnValueException("Null value returned by action closure of state [" + stateId + "] in page flow [" + flowId + "]!"); |
| } else if (result instanceof Event) { |
| return (Event)result; |
| } else if (result instanceof String) { |
| return new Event(closure, (String)result); |
| } else { |
| throw new InvalidClosureReturnValueException("Return value of type [" + result.getClass().getName() + "] returned by action closure of state [" + stateId + "] in page flow [" + flowId + "] is not supported!"); |
| } |
| } |
| |
| } |