org.xaloon.wicket.component.plugin.MenuPluginObserver.java Source code

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Here is the source code for org.xaloon.wicket.component.plugin.MenuPluginObserver.java

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/*
 * 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.xaloon.wicket.component.plugin;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Observable;
import java.util.Observer;

import org.apache.commons.lang.StringUtils;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.resource.loader.ClassStringResourceLoader;
import org.xaloon.wicket.component.mounting.MountPage;
import org.xaloon.wicket.component.mounting.MountPageGroup;
import org.xaloon.wicket.component.plugin.impl.MenuPluginImpl;
import org.xaloon.wicket.component.util.KeyValue;

/**
 * http://www.xaloon.org
 * 
 * @author vytautas racelis
 */
public class MenuPluginObserver implements Observer {
    private static final ClassStringResourceLoader cslr = new ClassStringResourceLoader(MountPageGroup.class);
    private PluginManager pluginManager;

    public MenuPluginObserver(PluginManager pluginManager) {
        this.pluginManager = pluginManager;
    }

    @SuppressWarnings("unchecked")
    public void update(Observable o, Object arg) {
        if (arg instanceof List) {
            processPageClassMenu((List<Class<? extends WebPage>>) arg);
        }
    }

    private void processPageClassMenu(List<Class<? extends WebPage>> pcl) {

        Map<String, MenuPlugin> plugins = new HashMap<String, MenuPlugin>();
        for (Class<? extends WebPage> clz : pcl) {
            MountPageGroup mpg = clz.getAnnotation(MountPageGroup.class);
            String key = "DEFAULT";
            if (clz.equals(WebApplication.get().getHomePage())) {
                key = MenuPlugin.HOME_PAGE;
            } else if (mpg != null) {
                key = mpg.context();
            }
            MenuPlugin plugin = pluginManager.retrievePlugin(MenuPlugin.class, key);
            if (plugin == null) {
                plugin = new MenuPluginImpl(key);
                String name = cslr.loadStringResource(null, key, null, null);
                if (StringUtils.isEmpty(name)) {
                    name = key;
                }
                plugin.setPluginName(name);
                plugin.setImageResourceKey(cslr.loadStringResource(null, plugin.getId() + ".img", null, null));
                pluginManager.register(plugin);
            }
            if (!plugins.containsKey(key)) {
                plugins.put(key, plugin);
            }
            MountPage annotation = clz.getAnnotation(MountPage.class);
            if ((annotation != null) && annotation.visible()) {
                String name = new ClassStringResourceLoader(clz).loadStringResource(clz, clz.getName(), null, null);
                plugin.addMenuItem(new KeyValue<String, Class<? extends WebPage>>(name, clz));
            }
        }
        for (MenuPlugin plugin : plugins.values()) {
            if (!plugin.hasMenuItems()) {
                pluginManager.unregister(plugin);
            }
        }
    }
}