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From Niall Pemberton <niall.pember...@gmail.com>
Subject Re: [Lang] Null safe date comparisson
Date Thu, 06 Jan 2011 23:51:31 GMT
On Thu, Jan 6, 2011 at 6:27 PM, Niall Pemberton
<niall.pemberton@gmail.com> wrote:
> 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

I've added this:

https://issues.apache.org/jira/browse/LANG-667
http://svn.apache.org/viewvc?view=revision&revision=1056124

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