Package org.apache.struts2.portlet.interceptor

Source Code of org.apache.struts2.portlet.interceptor.PortletStateInterceptor

/*
* $Id: PortletStateInterceptor.java 651946 2008-04-27 13:41:38Z apetrelli $
*
* 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 java.util.Map;

import javax.portlet.ActionResponse;
import javax.portlet.RenderRequest;

import org.apache.struts2.portlet.PortletActionConstants;
import org.apache.struts2.portlet.dispatcher.DirectRenderFromEventAction;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.opensymphony.xwork2.util.CompoundRoot;
import com.opensymphony.xwork2.util.TextUtils;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

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 (TextUtils.stringSet(request.getParameter(EVENT_ACTION))) {
      if(!isProperPrg(invocation)) {
        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(oldRoot);
          LOG.debug("Restored stack");
        }
      }
      else {
        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);
  }

}
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