DerivedRelation

DerivedRelationobject

Superclass
Tree Property
Summary Method
Summary Property
Details Method
Details

A DerivedRelation is one that doesn't maintain its own table of what it related to what, but works out what is related to what on the basis of some other relation(s) (e.g. a sibling relation might work by testing for common parents).

REQUIRES THE RELATIONS EXTENSION

DerivedRelation : Relation

Superclass Tree (in declaration order)

DerivedRelation
Relation
PreinitObject
ModuleExecObject
object

Summary of Properties

Inherited from Relation :
name reciprocal relationType relTab reverseName

Inherited from PreinitObject :
execBeforeMe reverseGlobalSymbols

Inherited from ModuleExecObject :
execAfterMe hasInitialized_ isDoingExec_ isExecuted_

Summary of Methods

addRelation isInverselyRelated isRelated listKeys relatedTo removeRelation

Inherited from Relation :
inverselyRelatedTo makeUnique

Inherited from ModuleExecObject :
_execute classExec execute

Properties

(none)

Methods

addRelation (objs)OVERRIDDEN relations.t[489]

By default we don't permit the direct addition of relationships via this relation, since this is a relation dependent upon external conditions.

isInverselyRelated (a, b)OVERRIDDEN relations.t[444]

Game code must override this method to determine whether a is inversely related to b unless it either overrides inverselyRelatedTo() to return a list of items to which a is inversely related or the relation is a reciprocal one.

isRelated (a, b)OVERRIDDEN relations.t[466]

If relatedTo has not been overriden to provide a list, instances need to override isRelated to provide a method that returns true or nil according to whether this DerivedRelationship holds between a and b.

listKeys ( )OVERRIDDEN relations.t[511]

We don't have any entries listed in the relTable, but there may be another way of building a list of the key values to which this DerivedRelalation applies; if so, particular instances can override this method to supply it here.

relatedTo (a)OVERRIDDEN relations.t[419]

Especially if listKeys() hasn't been defined on this DerivedRelation, instances may need to override to provide a method that returns a list of items related to a via this relationship, on the basis of whatever criteria are appropriate.

removeRelation (objs)OVERRIDDEN relations.t[500]

By default we don't permit the direct removal of relationships via this relation, since this is a relation dependent upon external conditions.

Adv3Lite Library Reference Manual
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