declareAndPossiblyRename: classThatIsARoot | existing catInstaller | "The class just arrived in this segment. How fit it into the Smalltalk dictionary? If it had an association, that was installed with associationDeclareAt:." catInstaller := [ classThatIsARoot superclass name == #Player ifTrue: [classThatIsARoot category: Object categoryForUniclasses] ifFalse: [(classThatIsARoot superclass name beginsWith: 'WonderLandActor') ifTrue: [classThatIsARoot category: 'Balloon3D-UserObjects'] ifFalse: [classThatIsARoot category: 'Morphic-Imported']]. ]. classThatIsARoot superclass addSubclass: classThatIsARoot. (Smalltalk includesKey: classThatIsARoot name) ifFalse: [ "Class entry in Smalltalk not referred to in Segment, install anyway." catInstaller value. ^ Smalltalk at: classThatIsARoot name put: classThatIsARoot]. existing := Smalltalk at: classThatIsARoot name. existing xxxClass == ImageSegmentRootStub ifTrue: [ "We are that segment! Must ask it carefully!" catInstaller value. ^ Smalltalk at: classThatIsARoot name put: classThatIsARoot]. existing == false | (existing == nil) ifTrue: [ "association is in outPointers, just installed" catInstaller value. ^ Smalltalk at: classThatIsARoot name put: classThatIsARoot]. "Conflict with existing global or copy of the class" (existing isKindOf: Class) ifTrue: [ classThatIsARoot isSystemDefined not ifTrue: [ "UniClass. give it a new name" classThatIsARoot setName: classThatIsARoot baseUniclass chooseUniqueClassName. catInstaller value. "must be after new name" ^ Smalltalk at: classThatIsARoot name put: classThatIsARoot]. "Take the incoming one" self inform: 'Using newly arrived version of ', classThatIsARoot name. classThatIsARoot superclass removeSubclass: classThatIsARoot. "just in case" (Smalltalk at: classThatIsARoot name) becomeForward: classThatIsARoot. catInstaller value. ^ classThatIsARoot superclass addSubclass: classThatIsARoot]. self error: 'Name already in use by a non-class: ', classThatIsARoot name.