/*
 * 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.net.URLEncoder;
import java.util.Locale;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts.Globals;
import org.apache.struts.util.MessageResources;
import org.apache.webapp.admin.ApplicationServlet;
import org.apache.webapp.admin.TreeBuilder;
import org.apache.webapp.admin.TreeControl;
import org.apache.webapp.admin.TreeControlNode;
import org.apache.webapp.admin.TomcatTreeBuilder;

/**
 * Implementation of <code>TreeBuilder</code> that adds the nodes required
 * for administering the resources (data sources).
 *
 * @author Manveen Kaur
 * @author Amy Roh
 * @version $Revision$ $Date$
 * @since 4.1
 */

public class ResourcesTreeBuilder implements TreeBuilder {

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


    // ---------------------------------------------------- TreeBuilder Methods


    /**
     * Add the required nodes to the specified <code>treeControl</code>
     * instance.
     *
     * @param treeControl The <code>TreeControl</code> to which we should
     *  add our nodes
     * @param servlet The controller servlet for the admin application
     * @param request The servlet request we are processing
     */
    public void buildTree(TreeControl treeControl,
                          ApplicationServlet servlet,
                          HttpServletRequest request) {

        MessageResources resources = (MessageResources)
            servlet.getServletContext().getAttribute(Globals.MESSAGES_KEY);
        HttpSession session = request.getSession();
        Locale locale = (Locale) session.getAttribute(Globals.LOCALE_KEY);
        addSubtree(treeControl.getRoot(), resources, locale);

    }


    // ------------------------------------------------------ Protected Methods


    /**
     * Add the subtree of nodes required for user administration.
     *
     * @param root The root node of our tree control
     * @param resources The MessageResources for our localized messages
     *  messages
     */
    protected void addSubtree(TreeControlNode root, MessageResources resources,
                              Locale locale) {
        try {
            String domain = root.getDomain();
            TreeControlNode subtree = new TreeControlNode
                ("Global Resource Administration",
                 "folder_16_pad.gif",
                 resources.getMessage(locale, "resources.treeBuilder.subtreeNode"),
                 null,
                 "content",
                 true, domain);        
            TreeControlNode datasources = new TreeControlNode
                ("Globally Administer Data Sources",
                 "Datasource.gif",
                 resources.getMessage(locale, "resources.treeBuilder.datasources"),
                 "resources/listDataSources.do?resourcetype=Global&domain=" +
                 domain + "&forward=" + 
                 URLEncoder.encode("DataSources List Setup",TomcatTreeBuilder.URL_ENCODING),
                 "content",
                 false, domain);
            TreeControlNode mailsessions = new TreeControlNode
                ("Globally Administer Mail Sessions ",
                 "Mailsession.gif",
                 resources.getMessage(locale, "resources.treeBuilder.mailsessions"),
                 "resources/listMailSessions.do?resourcetype=Global&domain=" +
                 domain + "&forward=" + 
                 URLEncoder.encode("MailSessions List Setup",TomcatTreeBuilder.URL_ENCODING),
                 "content",
                 false, domain);
            TreeControlNode userdbs = new TreeControlNode
                ("Globally Administer UserDatabase Entries",
                 "Realm.gif",
                 resources.getMessage(locale, "resources.treeBuilder.databases"),
                 "resources/listUserDatabases.do?domain=" + domain + 
                 "&forward=" + 
                 URLEncoder.encode("UserDatabases List Setup",TomcatTreeBuilder.URL_ENCODING),
                 "content",
                 false, domain);
            TreeControlNode envs = new TreeControlNode
                ("Globally Administer Environment Entries",
                 "EnvironmentEntries.gif",
                 resources.getMessage(locale, "resources.env.entries"),
                 "resources/listEnvEntries.do?resourcetype=Global&domain=" +
                 domain+"&forward="+
                 URLEncoder.encode("EnvEntries List Setup",TomcatTreeBuilder.URL_ENCODING),
                 "content",
                 false, domain);
            root.addChild(subtree);
            subtree.addChild(datasources);
            subtree.addChild(mailsessions);
            subtree.addChild(envs);
            subtree.addChild(userdbs);
        } catch(UnsupportedEncodingException ex) {
            // can't happen
        }
    }

}