@Override
	public int getFunctionCount() {
		return adapter.getRecordCount();
	}
Transform an existing external symbol into an external function.
This method should only be invoked by the Function Manager.
The {@link ExternalLocation#getOriginalImportedName() original imported name} will initially 
be null.

@param extSpaceAddr the external space address to use when creating this external.  Any 
other symbol using this address must first be deleted.  Results are unpredictable if this is 
not done.
@param name the external function name
@param nameSpace the external function namespace
@param externalProgramAddress the external program address (may be null)
@param originalImportName the original imported name if different from name (may be null)
@param source the source of this external.
@return external function
@throws InvalidInputException if the name is invalid
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionManagerDB.java