/**
 * -- Copyright (C) 2006 Hisham Khalil. All rights reserved.
 *
 * This program 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 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 *
 * Author: Hisham Khalil <hishberlin@hotmail.com>
 */


package connex.session.plugin;

import java.util.Hashtable;

import java.util.Collection;
import java.util.Enumeration;

public class PluginRegistry {
    private Hashtable plugins = new Hashtable();
    private Hashtable descriptors = new Hashtable();

    /**
     * @directed
     * @link aggregationByValue
     * @supplierCardinality 0..*
     * @clientCardinality 1
     */
    private Plugin lnkPlugin;

    /**
     * @directed
     * @link aggregationByValue
     * @supplierCardinality 0..*
     * @clientCardinality 1
     */
    private PluginDescriptor lnkPluginDescriptor;

    public PluginRegistry() {
    }

    protected void registerPlugin(String id, Plugin obj) {
        plugins.put(id, obj);
    }

    protected Plugin getPlugin(String id) {
        if (plugins.containsKey(id)) {

            return (Plugin) plugins.get(id);

        }

        return null;
    }
    protected boolean isRegistered(String id){
        if(descriptors.contains(id)){
            return true;
        }
        return false;
    }

    protected void registerDescriptor(String id, PluginDescriptor pd) {
        descriptors.put(id, pd);
    }

   protected PluginDescriptor getDescriptor(String id) {
        return (PluginDescriptor) descriptors.get(id);
    }


     protected void removePlugin(String id) {

        Plugin p = (Plugin) plugins.remove(id);
        p.stopPlugin();
    }

    protected void getPluginDescriptor(int id) {

    }

    /**
     *Returns a Collection of all PluginDescriptor objects
     *one for each entry point detected
     */

    public Collection getAllDescriptors() {

        if (descriptors == null) {
            return null;
        }
        return descriptors.values();
    }


    public Collection getAllPlugins() {
        if (plugins == null) {
            return null;
        }
        return plugins.values();
    }


    protected void clear() {
        descriptors.clear();
        Enumeration pluginsnum = (Enumeration) plugins.elements();

        while (pluginsnum.hasMoreElements()) {
            Plugin pd = (Plugin) pluginsnum.nextElement();
            pd.stopPlugin();

        }
        plugins.clear();
    }
}