constructUnion(IEnumGeometry geometries) - Java

LeoDonahue

constructUnion(IEnumGeometry geometries) -

http://help.arcgis.com/en/sdk/10.0/java_ao_adf/api/arcobjects/com/esri/arcgis/geometry/GeometryBag.html#constructUnion(com.esri.arcgis.geometry.IEnumGeometry)

"This method does not support GeometryBags."  and yet it is a method on the Class GeometryBag.

And there is an example here:
http://help.arcgis.com/en/sdk/10.0/java_ao_adf/conceptualhelp/engine/0001/0001000003nq000000.htm

typo?

NeilClemmons_GISinc

It's probably just poor wording.  The ConstructUnion method takes a parameter of type IEnumGeometry.  As long as the class instance you pass into the method implements this interface then there should be no reason for it not to work.  The GeometryBag coclass implements IEnumGeometry so therefore it should be just as valid as any other class that implements that interface.  With one stipulation - all of the geometries in the bag must be of the same dimension.

I believe what the help is actually trying to say is that the ConstructUnion is not implemented by the GeometryBag class.  The GeometryBag class implements ITopologicalOperator but the the implementation for the ConstructUnion method may be empty (i.e. there's no actual code there).  I have not run any tests to see if this is true or not.