/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.enterprise.gui.legacy.action;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.rhq.enterprise.gui.legacy.AttrConstants;
import org.rhq.enterprise.gui.legacy.ParamConstants;
import org.rhq.enterprise.gui.legacy.Portal;
import org.rhq.enterprise.gui.legacy.exception.ParameterNotFoundException;
import org.rhq.enterprise.gui.legacy.util.ActionUtils;
import org.rhq.enterprise.gui.legacy.util.SessionUtils;
/**
* An abstract <strong>Action</strong> that dispatches to a subclass mapped method based on the value of a request
* parameter.
*/
public abstract class BaseDispatchAction extends DispatchAction {
private static Log log = LogFactory.getLog(BaseDispatchAction.class.getName());
/**
* Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web
* component that will create it). Return an <code>ActionForward</code> instance describing where and how control
* should be forwarded, or <code>null</code> if the response has already been completed.
*
* @param mapping The ActionMapping used to select this instance
* @param request The HTTP request we are processing
* @param response The HTTP response we are creating
* @param form The optional ActionForm bean for this request (if any)
*
* @return Describes where and how control should be forwarded.
*
* @exception Exception if an error occurs
*/
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
// identify the request parameter containing the method name
String parameter = mapping.getParameter();
if (parameter == null) {
throw new ServletException("no dispatch parameter configured");
}
// identify the string to look up
String name = request.getParameter(parameter);
if (name == null) {
throw new ServletException("dispatch parameter [" + parameter + "] not found");
}
name = name.replaceAll("<","<")
.replaceAll("\"",""")
.replaceAll(">",">")
.replaceAll("&","&")
.replaceAll("'","'")
.replaceAll("/","/");
// look up the dispatch method
String methodName = getKeyMethodMap().getProperty(name);
if (methodName == null) {
throw new ServletException("dispatch method for key [" + name + "] not found");
}
// execute the dispatch method
ActionForward fwd = dispatchMethod(mapping, form, request, response, methodName);
// save the return path in case the user clicks into a
// workflow. be sure to include the mode parameter.
try {
Portal tmpPortal = (Portal) request.getAttribute(AttrConstants.PORTAL_KEY);
if (tmpPortal.doWorkflow()) {
Map<String, String> params = tmpPortal.getWorkflowParams();
if (params == null) {
params = new HashMap<String, String>();
params.put(ParamConstants.MODE_PARAM, name);
}
setReturnPath(request, mapping, params);
}
} catch (ServletException e) {
log.debug("Could not save return path: ", e);
} catch (ParameterNotFoundException pne) {
log.debug("Could not save return path: " + pne);
}
return fwd;
}
/**
* Provides the mapping from resource key to method name
*
* @return Resource key / method name map
*/
protected abstract Properties getKeyMethodMap();
/**
* Method to overload if the controller wants to be an origin for workflows. Child classes should customize this to
* participate in workflows.
*
* @param request The request to get the session to store the returnPath into.
* @param mapping The ActionMapping to get the input forward from.
* @param params A Map of request parameters to add to the return path.
*/
protected void setReturnPath(HttpServletRequest request, ActionMapping mapping, Map params) throws Exception {
String returnPath = ActionUtils.findReturnPath(mapping, params);
if (log.isTraceEnabled()) {
log.trace("setting return path: " + returnPath);
}
SessionUtils.setReturnPath(request.getSession(), returnPath);
}
protected void setReturnPath(HttpServletRequest request, ActionMapping mapping) throws Exception {
setReturnPath(request, mapping, new HashMap());
}
}