commons-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Niall Pemberton <niall.pember...@gmail.com>
Subject Re: [Lang] Null safe date comparisson
Date Thu, 06 Jan 2011 18:51:34 GMT
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

Niall

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

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org


Mime
View raw message