[OpenLayers-Users] Problems with Openlayers.Filter.Function in WFS

[brking]

If anyone is interested in how to make this work.

Format/Filter/v1.js:

add "FUNCTION" to the filter map

    filterMap: {
        "&&": "And",
...
        "FID": "_featureIds",
        "FUNCTION": "Function"
    },

I also wanted to support PropertyName as an argument to a function, so
change the writer to add a "properties" collection:

            "Function": function(filter) {
                var node = this.createElementNSPlus("ogc:Function", {
                    attributes: {
                        name: filter.name
                    }
                });
                var params = filter.params;
                for(var i=0, len=params.length; i<len; i++){
                    this.writeOgcExpression(params[i], node);
                }
                var properties = filter.properties;
                for(var i=0, len=properties.length; i<len; i++){
                    var propNode =
this.createElementNSPlus("ogc:PropertyName", { value:
properties[i] });
                    node.appendChild(propNode);
                }
                return node;
            },

Now I can use it like this:

                var subFilter = new OpenLayers.Filter.Function({
                    type: 'FUNCTION',
                    name: 'MyFunction',
                    params: [1.23, 4.56, 'param3'],
                    properties: ['Altitude', 'Heading']
                });

                var timeFilter = new OpenLayers.Filter.Logical( {
                        type: OpenLayers.Filter.Logical.AND,
                        filters: [
                            new OpenLayers.Filter.Comparison({
                                type:
OpenLayers.Filter.Comparison.GREATER_THAN_OR_EQUAL_TO,
                                property: 'startdate',
                                value: startDate
                            }),
                            subFilter
                        ]
                    }
                );

and get OGC encoded like this:

<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs"
service="WFS" version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/wfs
http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<wfs:Query typeName="feature:nyc_buildings" xmlns:feature="ncr">
		<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
			<ogc:And>
				<ogc:And>
					<ogc:PropertyIsGreaterThanOrEqualTo>
						<ogc:PropertyName>startdate</ogc:PropertyName>
						<ogc:Literal>"2003-04-12 04:00:00 z"</ogc:Literal>
					</ogc:PropertyIsGreaterThanOrEqualTo>
					<ogc:Function name="MyFunction">
						<ogc:Literal>1.23</ogc:Literal>
						<ogc:Literal>4.56</ogc:Literal>
						<ogc:Literal>param3</ogc:Literal>
						<ogc:PropertyName>Altitude</ogc:PropertyName>
						<ogc:PropertyName>Heading</ogc:PropertyName>
					</ogc:Function>
				</ogc:And>
				<ogc:BBOX>
					<ogc:PropertyName>the_geom</ogc:PropertyName>
					<gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326">
						<gml:coordinates decimal="." cs="," ts=" ">-188.17578125,-2.275390625
-7.82421875,82.275390625</gml:coordinates>
					</gml:Box>
				</ogc:BBOX>
			</ogc:And>
		</ogc:Filter>
	</wfs:Query>
</wfs:GetFeature>




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