Re: NSComparator - sorting objects in a NSMutableArray

EOSortOrdering.sortArrayUsingKeyOrderArray(yourArray, new NSArray 
(EOSortOrdering.sortOrderingWithKey("keypath.to.double.attribute",  
EOSortOrdering.CompareAscending)));

On Jun 22, 2006, at 3:13 AM, wojingo wrote:

> Hi Matt,
>
> Matt Kime wrote:
>> I have an NSMutableArray populated with objects. I want do sort them
>> based on a double type property. sortUsingComparator seems to be the
>> way to go. this means i need to implement a "compare" function in the
>> object.
>> this is the first time i'm tackling this technique and i'm finding
>> the javadocs too terse to understand. does anyone know where i can
>> find an example of this?
>
> This might help.
> http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Comparable.html
>
> I think the following will work.. However I just wrote it and  
> havent tried it so it probably will have something(s) wrong.  :)
>
> public int compare(Object o1, Object o2)
>     throws NSComparator.ComparisonException {
>
>   if (! (o1 instanceof o2) ) {
>       throw new NSComparator.ComparisonException(
>                 "null reference or wrong class");
>   }
>
>   double d1 = ((MyObject)o1).myDouble;
>   double d2 = ((MyObject)o2).myDouble;
>
>   if (d1 == d2) return NSComparator.OrderedSame;
>   if (d1 < d2 ) return NSComparator.OrderAscending;
>   return NSComparator.OrderDescending;
> }
>
>
> cheers,
>  - shaun
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