jtp.demod
Class ForwardChainingDemodulationProxy

java.lang.Object
  |
  +--jtp.demod.ForwardChainingDemodulationProxy

All Implemented Interfaces:

Reasoner

public class ForwardChainingDemodulationProxy

extends Object

implements Reasoner

ForwardChainingDemodulationProxy.java Created: Mon Aug 26 21:49:30 2002

Constructor Summary

ForwardChainingDemodulationProxy(CanonicalMapping map, Reasoner delegate)

Method Summary

boolean	acceptable(Object rs) decides if the goal is suitable for being processed by this reasoner.
ReasoningStepIterator	process(Object assertion) This method attempts to find proof for the goal.

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardChainingDemodulationProxy

public ForwardChainingDemodulationProxy(CanonicalMapping map,
                                        Reasoner delegate)

Method Detail

process

public ReasoningStepIterator process(Object assertion)
                              throws ReasoningException

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.

Specified by:

process in interface Reasoner

Parameters:

assertion - the goal: either a query or an assertion

Returns:

Throws:

ReasoningException -

acceptable

public boolean acceptable(Object rs)

Description copied from interface: Reasoner

decides if the goal is suitable for being processed by this reasoner. This method should be fast; if there are doubts as to whether a goal is acceptable, and it looks like determining it might take some time, the method should return true and let the process method figure it out.

Example. Many reasoners only process literals with certain predicates and arity. These reasoners will use those criteria to determine acceptability, for example a reasoner dealing with equality could accept goals that are:

1. Literals,
2. have = as their relation predicate,
3. have exactly two arguments.

Specified by:

acceptable in interface Reasoner

Returns: