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package com.hfg.util.scheduler;

import java.util.Date;

import com.hfg.units.TimeSpan;

//------------------------------------------------------------------------------
/**
 Scheduler that runs at a specified interval, specified in minutes.
 
 @author J. Alex Taylor, hairyfatguy.com
 
 */
//------------------------------------------------------------------------------
// com.hfg Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public class IntervalSchedule implements Schedule
{
   private long mStartTime;
   private TimeSpan mFrequency;

   //###########################################################################
   // CONSTRUCTORS
   //###########################################################################

   //---------------------------------------------------------------------------
   public IntervalSchedule(TimeSpan inFrequency)
   {
      mStartTime = System.currentTimeMillis();
      mFrequency = inFrequency;
   }

   //###########################################################################
   // PUBLIC METHODS
   //###########################################################################

   //---------------------------------------------------------------------------
   public TimeSpan getFrequency()
   {
      return mFrequency;
   }

   //---------------------------------------------------------------------------
   public Date next()
   {
      return nextAfter(new Date());
   }

   //---------------------------------------------------------------------------
   public Date nextAfter(Date inReferenceDate)
   {
      long msDelta = inReferenceDate.getTime() - mStartTime;

      long remainder = msDelta%mFrequency.getMilliseconds();

      return new Date(inReferenceDate.getTime() - remainder + getFrequency().getMilliseconds());
   }


}