/*
* $Id: CreateAction.java 510851 2007-02-23 07:05:18Z pbenedict $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.struts.chain.commands.servlet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.chain.Constants;
import org.apache.struts.chain.commands.util.ClassUtils;
import org.apache.struts.chain.contexts.ActionContext;
import org.apache.struts.chain.contexts.ServletActionContext;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.ModuleConfig;
import java.util.HashMap;
import java.util.Map;
/**
* <p>Concrete implementation of <code>AbstractCreateAction</code> for use in
* a Servlet API chain. Expects that the ActionContext passed into it can
* safely be cast to <code>ServletActionContext</code>.</p>
*/
public class CreateAction
extends org.apache.struts.chain.commands.AbstractCreateAction {
// ------------------------------------------------------ Instance Variables
private static final Log log = LogFactory.getLog(CreateAction.class);
/* :TODO The Action class' dependency on having its "servlet" property set
* requires this API-dependent subclass of AbstractCreateAction.
*/
protected synchronized Action getAction(ActionContext context, String type,
ActionConfig actionConfig)
throws Exception {
ModuleConfig moduleConfig = actionConfig.getModuleConfig();
String actionsKey = Constants.ACTIONS_KEY + moduleConfig.getPrefix();
Map actions = (Map) context.getApplicationScope().get(actionsKey);
if (actions == null) {
actions = new HashMap();
context.getApplicationScope().put(actionsKey, actions);
}
Action action = null;
synchronized (actions) {
action = (Action) actions.get(type);
if (action == null) {
action = createAction(context, type);
actions.put(type, action);
}
}
if (action.getServlet() == null) {
ServletActionContext saContext = (ServletActionContext) context;
ActionServlet actionServlet = saContext.getActionServlet();
action.setServlet(actionServlet);
}
return (action);
}
/**
* <p>Invoked by <code>getAction</code> when the <code>Action</code>
* actually has to be created. If the instance is already created and
* cached, this method will not be called. </p>
*
* @param context The <code>Context</code> for this request
* @param type Name of class to instantiate
* @return Instantiated Action class
* @throws Exception if there are any problems instantiating the Action
* class.
* @since Struts 1.3.7
*/
protected Action createAction(ActionContext context, String type) throws Exception {
log.info("Initialize action of type: " + type);
return (Action) ClassUtils.getApplicationInstance(type);
}
}