Thanks so much Martin! This makes a lot more sense to me now.
Landon
On Wed, Aug 7, 2013 at 8:49 AM, Martin Davis <[email protected]> wrote:
> There are big differences:
>
> 1) CoordinateSequenceFilter has access to the entire sequence, while
> CoordinateFilter only sees a single Coordinate at a time. This means that
> it has no ability to determine the context around the coordinate, which
> prevents using it to implement operations which require using adjacent
> coordinates (or even the entire sequence).
>
> 2) CoordinateSequenceFilter can determine whether a coordinate lies at the
> start or end of the sequence, which allows for special handling for cases
> that need it.
>
> 3) CoordinateSequenceFilter allows access to coordinate values without the
> need of copying them out into a new Coordinate object. This is not possible
> with CoordinateFilter, which means it is not an efficient framework for
> some kinds of algorithms.
>
> In general use CoordinateSequenceFilter instead of CoordinateFilter,
> unless the use case is simple and does not need to be optimized.
>
>
> On Wed, Aug 7, 2013 at 8:25 AM, Landon Blake <[email protected]
> > wrote:
>
>> Is there a major functional difference between CoordinateFilter and
>> CoordinateSequenceFilter? It seems everything you could accomplish with
>> CoordinateSequenceFilter could be done with CoordinateFilter.
>>
>> Is the main distinction the fact that using CoordinateSequenceFilter
>> would indicate when you moved from visiting one ring in a Polygon to the
>> next ring? It seems like you wouldn't get this distinction in an
>> implementation of CoordinateFilter.
>>
>> I'm just trying to understand the key differences in these interfaces,
>> and when you might choose one over the other.
>>
>> Thanks.
>>
>> Landon
>>
>>
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>
>
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