/*
 * Copyright (C) 2003-2011 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 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 org.etk.kernel.container.configuration;

import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

import org.xml.sax.EntityResolver;

/**
 * Created by The eXo Platform SAS
 * Author : eXoPlatform
 *          exo@exoplatform.com
 * Jun 20, 2011  
 */
public class Namespaces {

  /** . */
  public static final String      KERNEL_1_0_URI = "http://www.exoplaform.org/xml/ns/kernel_1_0.xsd";

  /** . */
  public static final String      KERNEL_1_1_URI = "http://www.exoplaform.org/xml/ns/kernel_1_1.xsd";

  /** . */
  public static final String      KERNEL_1_2_URI = "http://www.exoplaform.org/xml/ns/kernel_1_2.xsd";

  /**
   * All the namespaces related to the kernel
   */
  public static final Set<String> KERNEL_NAMESPACES_SET;

  static {
    Set<String> tmp = new LinkedHashSet<String>();
    tmp.add(KERNEL_1_0_URI);
    tmp.add(KERNEL_1_1_URI);
    tmp.add(KERNEL_1_2_URI);
    KERNEL_NAMESPACES_SET = Collections.unmodifiableSet(tmp);
  }

  /** . */
  static final EntityResolver     resolver;

  static {
    Map<String, String> resourceMap = new HashMap<String, String>();
    resourceMap.put(KERNEL_1_0_URI,
                    "org/exoplatform/container/configuration/kernel-configuration_1_0.xsd");
    resourceMap.put(KERNEL_1_1_URI,
                    "org/exoplatform/container/configuration/kernel-configuration_1_1.xsd");
    resourceMap.put(KERNEL_1_2_URI,
                    "org/exoplatform/container/configuration/kernel-configuration_1_2.xsd");
    resolver = new EntityResolverImpl(Namespaces.class.getClassLoader(), resourceMap);
  }

  /**
   * @return A safe copy of the list of kernel namespaces
   */
  public static String[] getKernelNamespaces() {
    return new String[] { KERNEL_1_0_URI, KERNEL_1_1_URI, KERNEL_1_2_URI };
  }

  /**
   * Indicates whether the given uri is a kernel namespace or not
   * 
   * @param uri the uri to check
   * @return <code>true</code> if it is a kernel namespace, <code>false</code>
   *         otherwise.
   */
  public static boolean isKernelNamespace(String uri) {
    return KERNEL_NAMESPACES_SET.contains(uri);
  }
}