/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * 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.apache.webapp.admin.resources;

import java.io.IOException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Locale;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import javax.management.Attribute;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.QueryExp;
import javax.management.Query;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.management.JMException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanInfo;
import org.apache.struts.util.MessageResources;
import org.apache.webapp.admin.ApplicationServlet;


/**
 * <p>Implementation of <strong>Action</strong> that saves a new or
 * updated resource link entry.</p>
 *
 * @author Amy Roh
 * @version $Revision$ $Date$
 * @since 4.1
 */

public final class SaveResourceLinkAction extends Action {


    // ----------------------------------------------------- Instance Variables

    /**
     * The MBeanServer we will be interacting with.
     */
    private MBeanServer mserver = null;

    // --------------------------------------------------------- Public Methods


    /**
     * 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 actionForm The optional ActionForm bean for this request (if any)
     * @param request The HTTP request we are processing
     * @param response The HTTP response we are creating
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet exception occurs
     */
    public ActionForward perform(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
        throws IOException, ServletException {

        // Look up the components we will be using as needed
        if (mserver == null) {
            mserver = ((ApplicationServlet) getServlet()).getServer();
        }
        MessageResources resources = getResources(request);
        HttpSession session = request.getSession();
        Locale locale = getLocale(request);

        // Has this transaction been cancelled?
        if (isCancelled(request)) {
            return (mapping.findForward("List ResourceLinks Setup"));
        }

        // Check the transaction token
        if (!isTokenValid(request)) {
            response.sendError
                (HttpServletResponse.SC_BAD_REQUEST,
                 resources.getMessage(locale, "users.error.token"));
            return (null);
        }

        // Perform any extra validation that is required
        ResourceLinkForm resourceLinkForm = (ResourceLinkForm) form;
        String objectName = resourceLinkForm.getObjectName();
     
        // Perform an "Add ResourceLink" transaction
        if (objectName == null) {

            String signature[] = new String[2];
            signature[0] = "java.lang.String";
            signature[1] = "java.lang.String";

            Object params[] = new Object[2];
            params[0] = resourceLinkForm.getName();
            params[1] = resourceLinkForm.getType();   
            
            String resourcetype = resourceLinkForm.getResourcetype();
            String path = resourceLinkForm.getPath();
            String host = resourceLinkForm.getHost();
            String domain = resourceLinkForm.getDomain();
                       
            ObjectName oname = null;

            try {
            
                if (resourcetype.equals("Global")) {
                    oname = new ObjectName( domain + 
                                            ResourceUtils.RESOURCELINK_TYPE + 
                                            ResourceUtils.GLOBAL_TYPE + 
                                            ",name=" + params[0]);
                } else if (resourcetype.equals("Context")) {
                    oname = new ObjectName( domain + 
                                            ResourceUtils.RESOURCELINK_TYPE + 
                                            ResourceUtils.CONTEXT_TYPE + 
                                            ",path=" + path + ",host=" + host + 
                                            ",name=" + params[0]);
                }         
                            
                if (mserver.isRegistered(oname)) {
                    ActionErrors errors = new ActionErrors();
                    errors.add("name",
                               new ActionError("resources.invalid.name"));
                    saveErrors(request, errors);
                    return (new ActionForward(mapping.getInput()));
                }   
                
                oname = ResourceUtils.getNamingResourceObjectName(domain,
                            resourcetype, path, host);
                            
                // Create the new object and associated MBean
                objectName = (String) mserver.invoke(oname, "addResourceLink",
                                                     params, signature);
                                     
            } catch (Exception e) {

                getServlet().log
                    (resources.getMessage(locale, "users.error.invoke",
                                          "addResourceLink"), e);
                response.sendError
                    (HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                     resources.getMessage(locale, "users.error.invoke",
                                          "addResourceLink"));
                return (null);
            }

        }
        
        // Perform an "Update User database" transaction
        String attribute = null;
        try {
            
            ObjectName oname = new ObjectName(objectName);
            
            attribute = "global";
            mserver.setAttribute
                (oname,
                 new Attribute(attribute, resourceLinkForm.getGlobal()));
            attribute = "type";
            mserver.setAttribute
                (oname,
                 new Attribute(attribute, resourceLinkForm.getType()));

        } catch (Exception e) {

            getServlet().log
                (resources.getMessage(locale, "users.error.set.attribute",
                                      attribute), e);
            response.sendError
                (HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                 resources.getMessage(locale, "users.error.set.attribute",
                                      attribute));
            return (null);

        }
        
        // Proceed to the list entries screen
        return (mapping.findForward("ResourceLinks List Setup"));

    }


}