TreeNode.java

/**
 *  C-Nery - A home automation web application for C-Bus.
 *  Copyright (C) 2008,2009,2012  Dave Oxley <dave@daveoxley.co.uk>.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.daveoxley.cnery.pages;

import com.daveoxley.cnery.entities.BaseEntity;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 *
 * @author dave
 */
public abstract class TreeNode<E extends BaseEntity> {

    protected abstract BaseEntity getEntity();

    protected abstract TreeNode getNewTreeNode(E e);

    protected void mergeNodes(Map<Long,TreeNode> nodes, List<E> entities) {
        // Remove obsolete keys
        List<Long> keys = new ArrayList<Long>();
        for (E e : entities)
            keys.add(e.getId());
        for (Long key : nodes.keySet()) {
            if (!keys.contains(key))
                nodes.remove(key);
        }

        // Add any new conditions
        for (E e : entities) {
            if (!nodes.containsKey(e.getId()))
                nodes.put(e.getId(), getNewTreeNode(e));
        }
    }

    public boolean isExpanded() {
        return true;
    }
}