org.opennms.features.vaadin.topology.MenuBarBuilder.java Source code

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Here is the source code for org.opennms.features.vaadin.topology.MenuBarBuilder.java

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/*******************************************************************************
 * This file is part of OpenNMS(R).
 *
 * Copyright (C) 2012 The OpenNMS Group, Inc.
 * OpenNMS(R) is Copyright (C) 1999-2012 The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
 *
 * OpenNMS(R) 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, either version 3 of the License,
 * or (at your option) any later version.
 *
 * OpenNMS(R) 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 OpenNMS(R).  If not, see:
 *      http://www.gnu.org/licenses/
 *
 * For more information contact:
 *     OpenNMS(R) Licensing <license@opennms.org>
 *     http://www.opennms.org/
 *     http://www.opennms.com/
 *******************************************************************************/

package org.opennms.features.vaadin.topology;

import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import com.vaadin.ui.MenuBar;
import com.vaadin.ui.MenuBar.Command;
import com.vaadin.ui.MenuBar.MenuItem;

public class MenuBarBuilder {

    private LinkedHashMap<String, Object> m_menuBar = new LinkedHashMap<String, Object>();

    public MenuBarBuilder() {

    }

    private void add(List<String> menuPath, Command command, Map<String, Object> menu) {
        if (menuPath.isEmpty()) {
            return;
        }
        String first = menuPath.get(0);

        if (menuPath.size() == 1) {
            if (menu.containsKey(first)) {
                add(Collections.singletonList(first + "_dup"), command, menu);
            } else {
                menu.put(first, command);
            }

        } else {
            Object item = menu.get(first);
            if (item == null) {
                Map<String, Object> subMenu = new LinkedHashMap<String, Object>();
                menu.put(first, subMenu);
                add(menuPath.subList(1, menuPath.size()), command, subMenu);
            } else if (item instanceof Map) {
                Map<String, Object> subMenu = (Map<String, Object>) item;
                add(menuPath.subList(1, menuPath.size()), command, subMenu);
            } else {
                List<String> newMenuPath = new LinkedList<String>();
                newMenuPath.add(first + "_dup");
                newMenuPath.addAll(menuPath.subList(1, menuPath.size()));
                add(newMenuPath, command, menu);
            }

        }
    }

    public MenuBar get() {
        MenuBar menuBar = new MenuBar();

        for (Entry<String, Object> entry : m_menuBar.entrySet()) {
            if (entry.getValue() instanceof Map) {
                MenuBar.MenuItem menuItem = menuBar.addItem(entry.getKey(), null);
                addMenuItems(menuItem, (Map<String, Object>) entry.getValue());
            } else {
                menuBar.addItem(entry.getKey(), (Command) entry.getValue());
            }

        }
        return menuBar;
    }

    private void addMenuItems(MenuItem subMenu, Map<String, Object> value) {
        for (Entry<String, Object> entry : value.entrySet()) {
            if (entry.getValue() instanceof Map) {
                MenuBar.MenuItem subMenuItem = subMenu.addItem(entry.getKey(), null);
                addMenuItems(subMenuItem, (Map<String, Object>) entry.getValue());
            } else {
                subMenu.addItem(entry.getKey(), (Command) entry.getValue());
            }

        }
    }

    public void add(LinkedList<String> menuPath, Command command) {
        add(menuPath, command, m_menuBar);
    }

    public void addMenuCommand(Command command, String menuPosition) {
        if (menuPosition != null) {
            LinkedList<String> menuPath = new LinkedList(Arrays.asList(menuPosition.split("\\|")));
            add(menuPath, command);
        }
    }
}