jtp.frame.fc
Class BackwardChainingStorage

java.lang.Object
  |
  +--java.beans.beancontext.BeanContextChildSupport
        |
        +--jtp.util.PropertyImporter
              |
              +--jtp.frame.fc.BackwardChainingStorage

All Implemented Interfaces:

BeanContextChild, BeanContextServiceRevokedListener, BeanContextServicesListener, EventListener, Reasoner, Serializable

public class BackwardChainingStorage

extends PropertyImporter

implements Reasoner

BackwardChainingStorage.java Created: Thu Jan 11 19:27:25 2001

See Also:

Serialized Form

Field Summary

Fields inherited from class java.beans.beancontext.BeanContextChildSupport

beanContext, beanContextChildPeer, pcSupport, rejectedSetBCOnce, vcSupport

Constructor Summary

BackwardChainingStorage()

Method Summary

boolean	acceptable(Object o) decides if the goal is suitable for being processed by this reasoner.
void	addFunctionSymbol(Symbol sym)
void	addRule(ClauseOrientation co)
UndoManager	getUndoManager()
ReasoningStepIterator	process(Object o) This method attempts to find proof for the goal.
boolean	removeRule(Symbol ruleSymbol)
void	setUndoManager(UndoManager v)
void	substitute(Map map) substitutes the keys in the provided map with their correspondent values in all the clauses stored in this data structure.

Methods inherited from class jtp.util.PropertyImporter

getImportedProperties, initializeBeanContextResources, setImportedProperties

Methods inherited from class java.beans.beancontext.BeanContextChildSupport

addPropertyChangeListener, addVetoableChangeListener, firePropertyChange, fireVetoableChange, getBeanContext, getBeanContextChildPeer, isDelegated, releaseBeanContextResources, removePropertyChangeListener, removeVetoableChangeListener, serviceAvailable, serviceRevoked, setBeanContext, validatePendingSetBeanContext

Methods inherited from class java.lang.Object

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

Constructor Detail

BackwardChainingStorage

public BackwardChainingStorage()

Method Detail

getUndoManager

public UndoManager getUndoManager()

setUndoManager

public void setUndoManager(UndoManager v)

addRule

public void addRule(ClauseOrientation co)

removeRule

public boolean removeRule(Symbol ruleSymbol)

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.

substitute

public void substitute(Map map)

substitutes the keys in the provided map with their correspondent values in all the clauses stored in this data structure.

Parameters:

map - the substitution map.

addFunctionSymbol

public void addFunctionSymbol(Symbol sym)