/**
    *    Copyright 2011 meltmedia
    *
    *    Licensed under the Apache License, Version 2.0 (the "License");
    *    you may not use this file except in compliance with the License.
    *    You may obtain a copy of the License at
    *
    *        http://www.apache.org/licenses/LICENSE-2.0
    *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package org.xchain.namespaces.core;
  
  import org.xchain.framework.lifecycle.Execution;
  import org.xchain.annotations.Function;
  import org.apache.commons.jxpath.ExpressionContext;
  
  /**
   * @author Christian Trimble
   */
  public class CoreFunctions
  {
    /**
     * Returns the system id of the current catalog.
     */
    @Function(localName="system-id")
    public static String getSystemId()
    {
      return Execution.getSystemId();
    }
  
    @Function(localName="value-of")
    public static Object getValueOf( ExpressionContext context, String xPath )
    {
      return context.getJXPathContext().getValue(xPath);
    }
  
    @Function(localName="value-of")
    public static <T> T getValueOf( ExpressionContext context, String xPath, Class<T> type )
    {
      return (T)context.getJXPathContext().getValue(xPath, type);
    }
  
    @Function(localName="class")
    public static Class getClass( String className )
      throws ClassNotFoundException
    {
      return Thread.currentThread().getContextClassLoader().loadClass(className);
    }
  }