jtp.demod
Class DemodulationReasoner

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

All Implemented Interfaces:

Reasoner, SequentialDispatcher.LocationPreference

public class DemodulationReasoner

extends Object

implements Reasoner, SequentialDispatcher.LocationPreference

DemodulationReasoner.java Created: Thu Aug 8 22:26:24 2002

Constructor Summary

DemodulationReasoner(CanonicalMapping mapping)

Method Summary

boolean	acceptable(Object o) decides if the goal is suitable for being processed by this reasoner.
int	getPreferredLocation()
ReasoningStepIterator	process(Object o) This method attempts to find proof for the goal.
DemodulationReasoningStep	translateGoal(CNFSentence s)

Methods inherited from class java.lang.Object

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

Constructor Detail

DemodulationReasoner

public DemodulationReasoner(CanonicalMapping mapping)

Method Detail

acceptable

public boolean acceptable(Object o)

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:

true if the goal is suitable for this reasoner, false otherwise.

process

public ReasoningStepIterator process(Object o)

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:

o - the goal: either a query or an assertion

Returns:

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

translateGoal

public DemodulationReasoningStep translateGoal(CNFSentence s)

getPreferredLocation

public int getPreferredLocation()

Specified by:

getPreferredLocation in interface SequentialDispatcher.LocationPreference