Re: [Geotools-gt2-users] filter.evaluate(feature) doesn't return expected result

[<hd...@gm...>]

Hi,
Great analysis,  it works when I change the attribute to something like "geom". Any suggestions on how to build a xpath like feature since xpath is used in my fiter object?

Many thanks,
...-H  
Sent from my BlackBerry device on the Rogers Wireless Network

-----Original Message-----
From: Andrea Aime <and...@ge...>
Sender: and...@gm...
Date: Sat, 8 Dec 2012 17:09:37 
To: Hoang Dam<hd...@gm...>
Cc: <geo...@li...>
Subject: Re: [Geotools-gt2-users] filter.evaluate(feature) doesn't return
 expected result

On Sat, Dec 8, 2012 at 6:30 AM, Hoang Dam <hd...@gm...> wrote:

> Hi list,
>
> I'm using geotool version 8.3 to use fes 2.0 filter for some geometry.  My
> filter object works as expected and contains the correct information [
> aixm:timeSlice//aixm:ElevatedPoint dwithin LINESTRING (51.5 -0.5, 38.9
> -77), distance: 50.0 ].  Then I create a simple feature that has a Point
> using SimpleFeatureTypeBuilder & SimpleFeatureBuilder as followed:
>
>         Object geometry = new GeometryFactory().createPoint(new
> Coordinate(38.9, -77))
>
>         SimpleFeatureTypeBuilder builderType = new
> SimpleFeatureTypeBuilder();
>         builderType.setName("Simple");
>         builderType .setNamespaceURI("http://www.some.namespace");
>         builderType .add(FEATURES_DEFAULT_GEOMETRY, Object.class);
>         builderType .setDefaultGeometry(FEATURES_DEFAULT_GEOMETRY);
>
>         SimpleFeatureBuilder builder = new
> SimpleFeatureBuilder(builderType.buildFeatureType());
>         builder.add(geometry);
>         SimpleFeature simpleFeature = builder.buildFeature("featureName");
>
>         match = filter.evaluate(simpleFeature);
>
> I would expect match to be true since the point is on the linestring, but
> it returns false.  What have I missed?
>

Can't say for sure, your example is incomplete, but I see you are using a
xpath to select
the attribute, as if it was a nested one, but simple features are flat,
they can't have nested attributes,
so the property evaluation probably returns null and makes the filter fail

Cheers
Andrea

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