com.haley.haleyrules
Interface Relation

All Superinterfaces:

KnowledgeBaseObject, Representation

public interface Relation

extends Representation

The Relation interface publishes the API a relational representation defined by the Eclipse "defrelation" construct. A relation is returned by KnowledgeBase.findRelation(String).

Author:

The Haley Enterprise Copyright © 1998-2004, all rights reserved. Questions, comments or to report a problem contact support@haley.com

Method Summary

int	arity() Gets the arity of the relation.
RelationAssertion	beginAssertion(WorkingMemory workingMemory)
boolean	isVariadic() Determine whether this relation accepts a variable number of parameters.

Methods inherited from interface com.haley.haleyrules.Representation

getName

Methods inherited from interface com.haley.haleyrules.KnowledgeBaseObject

getKnowledgeBase, release

Method Detail

isVariadic

public boolean isVariadic()
                   throws EclipseException

Determine whether this relation accepts a variable number of parameters.

Returns:

true if and only if this relation takes a variable number of parameters.

Throws:

EclipseException - if the knowledge base has been deleted

EclipseException - if the relation has been deleted

EclipseException - if the working memory is null or has been deleted

arity

public int arity()
          throws EclipseException

Gets the arity of the relation.

Returns:

the arity of the relation or -1 if the relation is variadic

Throws:

EclipseException

beginAssertion

public RelationAssertion beginAssertion(WorkingMemory workingMemory)
                                 throws EclipseException

Throws:

EclipseException