Setting filter after dynamically adding a layer sends a GET_IMAGE request instead of a GET_FEATURES request

Description

If a Filter is set on a Feature Layer, ArcIMS Java Connector normally sends a GET_FEATURES request. However, if a layer is dynamically added to the map before applying the Filter object, it sends a GET_IMAGE request even though users are interested in getting attribute information and not a map image.

Cause

When a dynamic layer is added to the map, Java Connector sends a GET_IMAGE request.

Workaround

1. Add a dynamic layer:
   
   

   Code:
   ShapeWorkspace shpw = new ShapeWorkspace();
   ...
   map.addWorkspace(shpw);
   Dataset data = new Dataset();
   ...
   FeatureLayer fl = new FeatureLayer("topo", null, null);
   fl.setDataset(data);
   ...
   map.getLayers().add(fl);

   
   
2. Apply the Filter object on the Feature layer:
   
   

   Code:
   Filter filter = new Filter();
   filter.setSpatialObject(envelope);
   ...
   fLayer = (FeatureLayer)map.getLayers().item(1); 
   fLayer.setFilterObject(filter);

   
   
3. Call Map.refresh() to trigger the request, note that the request is GET_IMAGE because of the existence of the dynamic layer:
   
   

   Code:
   map.refresh();
   mapURL = map.getMapOutput().getURL();

   
   
4. To send a GET_FEATURES request, remove the dynamic layer and its workspace:
   
   

   Code:
   map.getLayers().remove(map.getLayers().getCount()-1);
   map.removeWorkspace(0);

   
   
5. Call Map.refresh() again, this time the request is GET_FEATURES.
6. The following is a complete sample code that can run with the 'SantaClara' service to add a new layer from 'sc_topoq24' shapefile that comes with the tutorial data. Click on the 'tract' layer to query features from this layer. GetFeatures.zip