net.sf.tweety.beliefdynamics

Class LeviBaseRevisionOperator<T extends ClassicalFormula>

java.lang.Object

net.sf.tweety.beliefdynamics.LeviBaseRevisionOperator<T>

Type Parameters:

T - the type of formulas this operators works on.

All Implemented Interfaces:

BaseRevisionOperator<T>

public class LeviBaseRevisionOperator<T extends ClassicalFormula>
extends java.lang.Object
implements BaseRevisionOperator<T>

This class implements the Levi identity for revision, ie. an revision that is composed of the contraction with the negated formula and then expansion of the formula.

Author:

Matthias Thimm

Field Summary

Fields

Modifier and Type	Field and Description
private BaseContractionOperator<T>	contraction The contraction operator of this Levi revision.
private BaseExpansionOperator<T>	expansion The expansion operator of this Levi revision.

Constructor Summary

Constructors

Constructor and Description
LeviBaseRevisionOperator(BaseContractionOperator<T> contraction, BaseExpansionOperator<T> expansion) Creates a new Levi base revision with the given contraction and expansion operators.

Method Summary

Modifier and Type	Method and Description
java.util.Collection<T>	revise(java.util.Collection<T> base, T formula) Revises the given collection of formulas by the given formula.

Methods inherited from class java.lang.Object

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

Field Detail

contraction

private BaseContractionOperator<T extends ClassicalFormula> contraction

The contraction operator of this Levi revision.

expansion

private BaseExpansionOperator<T extends ClassicalFormula> expansion

The expansion operator of this Levi revision.

Constructor Detail

LeviBaseRevisionOperator

public LeviBaseRevisionOperator(BaseContractionOperator<T> contraction,
                                BaseExpansionOperator<T> expansion)

Creates a new Levi base revision with the given contraction and expansion operators.

Parameters:

contraction - some contraction operator.

expansion - some expansion operator.

Method Detail

revise

public java.util.Collection<T> revise(java.util.Collection<T> base,
                                      T formula)

Description copied from interface: BaseRevisionOperator

Revises the given collection of formulas by the given formula.

Specified by:

revise in interface BaseRevisionOperator<T extends ClassicalFormula>

Parameters:

base - some collection of formulas.

formula - a formula

Returns:

the revised collection.