setuptreeaction.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/webapps/admin/WEB-INF/classes/org/apache/webapp/admin/SetUpTreeAction.java,v 1.2 2003/03/18 10:48:14 amyroh Exp $
 * $Revision: 1.2 $
 * $Date: 2003/03/18 10:48:14 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 *    Foundation" must not be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "Apache"
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package org.apache.webapp.admin;


import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.ArrayList;
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.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


/**
 * Test <code>Action</code> sets up  tree control data structure
 * for tree widget
 *
 * @author Jazmin Jonson
 * @author Manveen Kaur
 * @version $Revision: 1.2 $ $Date: 2003/03/18 10:48:14 $
 */

public class SetUpTreeAction extends Action {

    public static final String DOMAIN_KEY = "domain";
    public static final int INIT_PLUGIN_MAX = 10;
    public static final String TREEBUILDER_KEY = "treebuilders";
    public static final String ROOTNODENAME_KEY = "rootnodename";

    // --------------------------------------------------------- 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 {

        ApplicationServlet servlet = (ApplicationServlet)getServlet();

        // Getting init parms from web.xml

        // Get the string to be displayed as root node while rendering the tree
        String rootnodeName = 
            (String)servlet.getServletConfig().getInitParameter(ROOTNODENAME_KEY);
        
        String treeBuildersStr  =
            (String)servlet.getServletConfig().getInitParameter(TREEBUILDER_KEY);
        
        String domain  =
            (String)servlet.getServletConfig().getInitParameter(DOMAIN_KEY);
        
        
        // Make the root node and tree control
        
        // The root node gets rendered only if its value 
        // is set as an init-param in web.xml
        
        TreeControlNode root =
            new TreeControlNode("ROOT-NODE",
                                null, rootnodeName,
                                "setUpTree.do?select=ROOT-NODE",
                                "content", true, domain);
                
        TreeControl control = new TreeControl(root);
        
        if(treeBuildersStr != null) {
            Class treeBuilderImpl;
            TreeBuilder treeBuilderBase;

            ArrayList treeBuilders = new ArrayList(INIT_PLUGIN_MAX);
            int i = 0;
            StringTokenizer st = new StringTokenizer(treeBuildersStr, ",");
            while (st.hasMoreTokens()) {
                treeBuilders.add(st.nextToken().trim());
            }

            if(treeBuilders.size() == 0)
                treeBuilders.add(treeBuildersStr.trim());

            for(i = 0; i < treeBuilders.size(); i++) {

                try{
                    treeBuilderImpl = Class.forName((String)treeBuilders.get(i));
                    treeBuilderBase =
                        (TreeBuilder)treeBuilderImpl.newInstance();
                    treeBuilderBase.buildTree(control, servlet, request);
                }catch(Throwable t){
                    t.printStackTrace(System.out);
                }
            }
        }

        HttpSession session = request.getSession();
        session.setAttribute("treeControlTest", control);

         String  name = request.getParameter("select");
         if (name != null) {
            control.selectNode(name);
            // Forward back to the Blank page
            return (mapping.findForward("Blank"));
        }

         return (mapping.findForward("Tree Control Test"));

    }
}