/*
 * Copyright (C) 2003-2007 eXo Platform SAS.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see<http://www.gnu.org/licenses/>.
 */
package org.exoplatform.services.command.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import org.xml.sax.SAXException;

import org.apache.commons.chain.Catalog;
import org.apache.commons.chain.CatalogFactory;
import org.apache.commons.chain.config.ConfigParser;
import org.apache.commons.chain.impl.CatalogFactoryBase;
import org.apache.commons.digester.Digester;

import org.exoplatform.container.component.ComponentPlugin;

/**
 * Created by The eXo Platform SAS.
 * 
 * @author <a href="mailto:gennady.azarenkov@exoplatform.com">Gennady
 *         Azarenkov</a>
 * @version $Id: CommandService.java 12832 2007-02-15 12:41:32Z geaz $
 */

public class CommandService {

  // protected Catalog catalog;

  protected CatalogFactory catalogFactory;

  protected Digester       digester;

  public CommandService() {
    this.catalogFactory = CatalogFactoryBase.getInstance();

    ConfigParser parser = new ConfigParser();
    this.digester = parser.getDigester();
  }

  public void addPlugin(ComponentPlugin plugin) {
    // no needs to do anything as CatalogFactory is initialized in plugin

    // if (plugin instanceof CommonsXMLConfigurationPlugin) {
    // CommonsXMLConfigurationPlugin cplugin = (CommonsXMLConfigurationPlugin)
    // plugin;
    // can just reinitialize it every time as have single instance
    // catalog = cplugin.getCatalog();
    // Iterator names = cplugin.getCatalogNames();
    // while(names.hasNext()) {
    // String name = (String)names.next();
    // catalogs.put(name, cplugin.getCatalog(name));
    // }
    // }
  }

  /**
   * puts catalog (add or update) using XML input stream
   * 
   * @param xml
   * @throws IOException
   * @throws SAXException
   */
  public void putCatalog(InputStream xml) throws IOException, SAXException {
    // ConfigParser parser = new ConfigParser();
    // Prepare our Digester instance
    // Digester digester = parser.getDigester();
    digester.clear();
    digester.parse(xml);

    // parser.getDigester().parse(xml);
  }

  /**
   * @return default catalog
   */
  public Catalog getCatalog() {
    Catalog catalog = catalogFactory.getCatalog();
    return catalog;
  }

  /**
   * @param name
   * @return named catalog
   */
  public Catalog getCatalog(String name) {
    Catalog catalog = catalogFactory.getCatalog(name);
    return catalog;

  }

  /**
   * @return iterator of catalog names. default catalog is not listed here!
   */
  public Iterator getCatalogNames() {
    return catalogFactory.getNames();
  }

}