/*
    * $Id: Ms2hourFunction.java 1419 2010-11-01 14:12:17Z hoheisel $
    *
    * Copyright (c) 2005, The K-Wf Grid Consortium
    * Fraunhofer Institute for Computer Architecture and Software Technology
    * See http://www.kwfgrid.eu and http://www.first.fraunhofer.de for more details.
    */
   
   package net.kwfgrid.gwes.jaxen;
  
  import org.jaxen.Function;
  import org.jaxen.Context;
  import org.jaxen.FunctionCallException;
  import org.jaxen.function.NumberFunction;
  
  import java.util.List;
  import java.util.Calendar;
  
  /**
   * Converts date time in Milliseconds from 1970 to Double, representing the hour of day.
   * Input: Double, output: Double.
   * Important: returns hour for local time zone!
   * @author Andreas Hoheisel
   *         (<a href="http://www.andreas-hoheisel.de">www.andreas-hoheisel.de</a>)
   * @version $Id: Ms2hourFunction.java 1419 2010-11-01 14:12:17Z hoheisel $
   */
  public class Ms2hourFunction implements Function {
  
      public Object call(Context context, List args) throws FunctionCallException {
          if (args.isEmpty()) throw new FunctionCallException("Argument missing.");
          if (args.size() > 1) throw new FunctionCallException("Too many arguments.");
          Double dms = (Double)args.get(0);
          long ms = dms.longValue();
          TimeScheme time = new TimeScheme(ms);
          Integer ivalue = time.getCal().get(Calendar.HOUR_OF_DAY);
          return ivalue.doubleValue();
      }
  
  }