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From Gary Gregory <GGreg...@seagullsoftware.com>
Subject RE: [Lang] Null safe date comparisson
Date Thu, 06 Jan 2011 18:55:26 GMT
> -----Original Message-----
> From: Niall Pemberton [mailto:niall.pemberton@gmail.com]
> Sent: Thursday, January 06, 2011 13:52
> To: Commons Users List
> Subject: Re: [Lang] Null safe date comparisson
> 
> On Thu, Jan 6, 2011 at 6:47 PM, Gary Gregory
> <GGregory@seagullsoftware.com> wrote:
> >> -----Original Message-----
> >> From: Niall Pemberton [mailto:niall.pemberton@gmail.com]
> >> Sent: Thursday, January 06, 2011 13:28
> >> To: Commons Users List
> >> Subject: Re: [Lang] Null safe date comparisson
> >>
> >> On Thu, Jan 6, 2011 at 4:38 PM, sebb <sebbaz@gmail.com> wrote:
> >> > On 6 January 2011 16:31, Ludwig Magnusson <ludwig@itcatapult.com>
wrote:
> >> >> Hi!
> >> >>
> >> >> I'm looking for a way to do null safe date comparison. Something like:
> >> >>
> >> >>
> >> >>
> >> >> public static boolean isBefore(Date first, Date second);
> >> >>
> >> >>
> >> >>
> >> >> The method would handle null in an appropriate way.
> >> >
> >> > What do you mean by appropriate?
> >> >
> >> > Does null mean beginning of time, or end of time, or now, or Y2K or
> >> > something else?
> >> >
> >> > How does one choose the default?
> >>
> >> I was thinking it would be usefule to have a null safe compare method
> >> to ObjectUtils - something like
> >>
> >>     public static int compare(Comparable c1, Comparable c2) {
> >>         return compare(c1, c2, false);
> >>     }
> >>     public static int compare(Comparable c1, Comparable c2, boolean
> >> nullMoreThan) {
> >>         int result = 0;
> >>         if ((c1 == null) || (c2 == null)) {
> >>             if (nullMoreThan) {
> >>                 result = (c1 == null ? 1 : 0) - (c2 == null ? 1 : 0);
> >>             } else {
> >>                 result = (c1 == null ? -1 : 0) - (c2 == null ? -1 :
0);
> >>             }
> >>         } else {
> >>             result = c1.compareTo(c2);
> >>         }
> >>         return result;
> >>     }
> >>
> >> As dates implement comparable it would work for them as well
> >>
> >> Niall
> >
> > +1 That would be useful. Same for equals?
> 
> Its there already!
> 
> http://tinyurl.com/36e6oes

Doh!
Gary

> 
> Niall
> 
> > Gary
> >
> >>
> >> >> I haven't found any method like that in DateUtils.
> >> >>
> >> >> Is there one somewhere?
> >> >>
> >> >> /Ludwig
> >> >>
> >> >>
> 
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