jtp.func
Class ForIn

java.lang.Object
  |
  +--jtp.disp.AbstractRelationBasedReasoner
        |
        +--jtp.disp.AbstractRelationBasedBCReasoner
              |
              +--jtp.func.ForIn

All Implemented Interfaces:

Reasoner, RelationBasedBCReasoner, RelationBasedReasoner, Serializable

public class ForIn

extends AbstractRelationBasedBCReasoner

ForIn.java Created: Thu Dec 30 06:03:43 1999

See Also:

Serialized Form

Field Summary

static Symbol

Setof

Fields inherited from class jtp.disp.AbstractRelationBasedBCReasoner

arity, polarity, relation

Fields inherited from interface jtp.disp.RelationBasedReasoner

ANY_ARITY, BOTH, NEGATIVE, POSITIVE

Constructor Summary

ForIn()

Method Summary

static Literal	makeLiteral(List ts)
ReasoningStepIterator	process(Object gob) This method attempts to find proof for the goal.

Methods inherited from class jtp.disp.AbstractRelationBasedBCReasoner

acceptable, getArity, getPolarity, getRelation, literalAcceptable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface jtp.disp.RelationBasedReasoner

getArity, getPolarity, getRelation

Field Detail

Setof

public static Symbol Setof

Constructor Detail

ForIn

public ForIn()

Method Detail

process

public ReasoningStepIterator process(Object gob)

Description copied from interface: Reasoner

This method attempts to find proof for the goal. It returns an enumeration of reasoning steps that correspond to alternative proofs for the goal. Consequently, the items of the enumeration can actually belong to different models of the goal sentence, and have incompatible variable assignments.

Example. A reasoner that performs unification of the goal with facts in a knowledge base can return the following enumeration for the goal (parent joe ?x):

1. A reasoning step proving (parent joe fred) with variable assignment ?x=fred,
2. A reasoning step proving (parent joe mary) with variable assignment ?x=mary.

Parameters:

gob - the goal: either a query or an assertion

Returns:

the iterator of reasoning steps - proofs for the query, or consequences of the assertion.

makeLiteral

public static Literal makeLiteral(List ts)