jtp.demod
Class DemodulatingProxy

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

All Implemented Interfaces:

Reasoner

public class DemodulatingProxy

extends Object

implements Reasoner

DemodulatingProxy.java Created: Thu Aug 8 23:10:09 2002

Constructor Summary

DemodulatingProxy(CanonicalMapping mapping, Reasoner delegate)

Method Summary

boolean	acceptable(Object goal) decides if the goal is suitable for being processed by this reasoner.
ReasoningStepIterator	process(Object goal) 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

DemodulatingProxy

public DemodulatingProxy(CanonicalMapping mapping,
                         Reasoner delegate)

Method Detail

acceptable

public boolean acceptable(Object goal)

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 goal)
                              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:

goal - the goal: either a query or an assertion

Returns:

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

ReasoningException