[mapguide-trac] #1154: MgLayerBase should be able to get the filter of layer definition

[MapGuide Open Source]

#1154: MgLayerBase should be able to get the filter of layer definition
----------------------------+-----------------------------------------------
   Reporter:  christinebao  |       Owner:  Christine Bao
       Type:  defect        |      Status:  new          
   Priority:  medium        |   Milestone:               
  Component:  General       |     Version:  2.0.2        
   Severity:  trivial       |    Keywords:               
External_id:  1277730       |  
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 This requirement is from ticket http://trac.osgeo.org/fusion/ticket/327:
 Query: The matched objects excluded by layer filter are listed in Query
 result.

 Layer definition may have filter, for example:[[BR]]

 {{{
 <LayerDefinition xsi:noNamespaceSchemaLocation="LayerDefinition-1.3.0.xsd"
 version="1.3.0">
       <VectorLayerDefinition>
 <ResourceId>Library://Theme/Data/bayarea_cities.FeatureSource</ResourceId>
            <FeatureName>SHP_Schema:bayarea_cities</FeatureName>
            <FeatureNameType>FeatureClass</FeatureNameType>
            <Filter>Autogenerated_SDF_ID < 3</Filter>
            <Geometry>SHPGEOM</Geometry>
 }}}


 MgLayerBase has APIs for read resource Id, feature name and geometry, but
 there is no way to get filter. It's better to make MgLayerBase have an API
 GetFilter(), and return the filter inside layer definition.

-- 
Ticket URL: <https://trac.osgeo.org/mapguide/ticket/1154>
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