| /* |
| * $Id$ |
| * |
| * 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.struts2.portlet.interceptor; |
| |
| import com.opensymphony.xwork2.ActionInvocation; |
| import com.opensymphony.xwork2.interceptor.AbstractInterceptor; |
| import com.opensymphony.xwork2.util.CompoundRoot; |
| import com.opensymphony.xwork2.util.ValueStack; |
| import com.opensymphony.xwork2.util.logging.Logger; |
| import com.opensymphony.xwork2.util.logging.LoggerFactory; |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.struts2.portlet.PortletActionConstants; |
| import org.apache.struts2.portlet.dispatcher.DirectRenderFromEventAction; |
| |
| import javax.portlet.ActionResponse; |
| import javax.portlet.RenderRequest; |
| import java.util.Map; |
| |
| public class PortletStateInterceptor extends AbstractInterceptor implements PortletActionConstants { |
| |
| private final static Logger LOG = LoggerFactory.getLogger(PortletStateInterceptor.class); |
| |
| private static final long serialVersionUID = 6138452063353911784L; |
| |
| @Override |
| public String intercept(ActionInvocation invocation) throws Exception { |
| Integer phase = (Integer) invocation.getInvocationContext().get(PHASE); |
| if (RENDER_PHASE.equals(phase)) { |
| restoreStack(invocation); |
| return invocation.invoke(); |
| } else if (EVENT_PHASE.equals(phase)) { |
| try { |
| return invocation.invoke(); |
| } finally { |
| saveStack(invocation); |
| } |
| } else { |
| return invocation.invoke(); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void saveStack(ActionInvocation invocation) { |
| Map session = invocation.getInvocationContext().getSession(); |
| session.put(STACK_FROM_EVENT_PHASE, invocation.getStack()); |
| ActionResponse actionResponse = (ActionResponse) invocation.getInvocationContext().get(RESPONSE); |
| actionResponse.setRenderParameter(EVENT_ACTION, "true"); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void restoreStack(ActionInvocation invocation) { |
| RenderRequest request = (RenderRequest) invocation.getInvocationContext().get(REQUEST); |
| if (StringUtils.isNotEmpty(request.getParameter(EVENT_ACTION))) { |
| if(!isProperPrg(invocation)) { |
| if (LOG.isDebugEnabled()) LOG.debug("Restoring value stack from event phase"); |
| ValueStack oldStack = (ValueStack) invocation.getInvocationContext().getSession().get( |
| STACK_FROM_EVENT_PHASE); |
| if (oldStack != null) { |
| CompoundRoot oldRoot = oldStack.getRoot(); |
| ValueStack currentStack = invocation.getStack(); |
| CompoundRoot root = currentStack.getRoot(); |
| root.addAll(0, oldRoot); |
| if (LOG.isDebugEnabled()) LOG.debug("Restored stack"); |
| } |
| } |
| else { |
| if (LOG.isDebugEnabled()) LOG.debug("Won't restore stack from event phase since it's a proper PRG request"); |
| } |
| } |
| } |
| |
| private boolean isProperPrg(ActionInvocation invocation) { |
| return !(invocation.getAction() instanceof DirectRenderFromEventAction); |
| } |
| |
| } |