001package com.hfg.util.io;
002
003import java.util.Comparator;
004
005import com.hfg.datetime.DateSortDirection;
006
007//------------------------------------------------------------------------------
008/**
009 * Comparator for comparing RemoteFile objects based on their timestamps.
010 *
011 * @author J. Alex Taylor, hairyfatguy.com
012 */
013//------------------------------------------------------------------------------
014// com.hfg XML/HTML Coding Library
015//
016// This library is free software; you can redistribute it and/or
017// modify it under the terms of the GNU Lesser General Public
018// License as published by the Free Software Foundation; either
019// version 2.1 of the License, or (at your option) any later version.
020//
021// This library is distributed in the hope that it will be useful,
022// but WITHOUT ANY WARRANTY; without even the implied warranty of
023// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
024// Lesser General Public License for more details.
025//
026// You should have received a copy of the GNU Lesser General Public
027// License along with this library; if not, write to the Free Software
028// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
029//
030// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
031// jataylor@hairyfatguy.com
032//------------------------------------------------------------------------------
033
034
035public class RemoteFileTimestampComparator implements Comparator
036{
037
038   private DateSortDirection mDirection;
039
040   //###########################################################################
041   // CONSTRUCTORS
042   //###########################################################################
043
044   //---------------------------------------------------------------------------
045   public RemoteFileTimestampComparator(DateSortDirection inDirection)
046   {
047      mDirection = inDirection;
048   }
049
050
051
052   //###########################################################################
053   // PUBLIC METHODS
054   //###########################################################################
055
056   //---------------------------------------------------------------------------
057   public int compare(Object o, Object o1)
058   {
059      RemoteFile one = (RemoteFile) o;
060      RemoteFile two = (RemoteFile) o1;
061
062      int returnValue = 0;
063
064      if (one.getTimestamp() != null)
065      {
066         if (two.getTimestamp() != null)
067         {
068            if (one.getTimestamp().getTimeInMillis() > two.getTimestamp().getTimeInMillis())
069            {
070               returnValue = -1;
071            }
072            else if (one.getTimestamp().getTimeInMillis() < two.getTimestamp().getTimeInMillis())
073            {
074               returnValue = 1;
075            }
076         }
077      }
078
079      if (mDirection == DateSortDirection.OLDER_TO_NEWER) returnValue = -returnValue;
080
081      return returnValue;
082   }
083
084}