it.unibo.cs.belief
Class TreeBeliefFunction

java.lang.Object
  it.unibo.cs.belief.TreeBeliefFunction

All Implemented Interfaces:

BeliefFunction

public class TreeBeliefFunction
extends java.lang.Object
implements BeliefFunction

An efficient implementation of a belief function based on a tree map.

Version:

0.1

Author:

Matteo Magnani

Field Summary

private Proposition	core
private Frame	frame
private java.util.TreeMap	sets

Constructor Summary

TreeBeliefFunction(Frame frame)

Method Summary

void	addBelief(Proposition prop, double mass) Increases the belief in a proposition by a specified value.
double	getBelief(Proposition prop) Finds the belief assigned to a proposition so far.
CommonalityFunction	toCommonalityFunction() Produces the commonality function corresponding to this belief function.
MassPotential	toMassPotential() Produces a mass potential corresponding to this belief function.
PlausibilityFunction	toPlausibilityFunction() Produces the plausibility function corresponding to this belief function.
java.lang.String	toString() Produces a string representation of this belief function.

Methods inherited from class java.lang.Object

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

Field Detail

frame

private Frame frame

core

private Proposition core

sets

private java.util.TreeMap sets

Constructor Detail

TreeBeliefFunction

public TreeBeliefFunction(Frame frame)

Method Detail

addBelief

public void addBelief(Proposition prop,
                      double mass)

Description copied from interface: BeliefFunction

Increases the belief in a proposition by a specified value. This method may lead to functions that do not represent degrees of beliefs. Therefore, it should not be used by classes outside the package, except if you know what you are doing.

Specified by:

addBelief in interface BeliefFunction

Parameters:

prop - the proposition to which the belief is assigned

mass - the belief assigned to the proposition

getBelief

public double getBelief(Proposition prop)

Description copied from interface: BeliefFunction

Finds the belief assigned to a proposition so far.

Specified by:

getBelief in interface BeliefFunction

Parameters:

prop - the proposition we want to check

Returns:

a degree of belief

toMassPotential

public MassPotential toMassPotential()

Description copied from interface: BeliefFunction

Produces a mass potential corresponding to this belief function. In particular, this mass potential is (approximately) a mass function.

Specified by:

toMassPotential in interface BeliefFunction

Returns:

a mass potential

toPlausibilityFunction

public PlausibilityFunction toPlausibilityFunction()

Description copied from interface: BeliefFunction

Produces the plausibility function corresponding to this belief function.

Specified by:

toPlausibilityFunction in interface BeliefFunction

Returns:

a plausibility function

toCommonalityFunction

public CommonalityFunction toCommonalityFunction()

Description copied from interface: BeliefFunction

Produces the commonality function corresponding to this belief function.

Specified by:

toCommonalityFunction in interface BeliefFunction

Returns:

a commonality function

toString

public java.lang.String toString()

Produces a string representation of this belief function.

Overrides:

toString in class java.lang.Object

Returns:

a list of all subsets of the frame corresponding to this belief function, with their numerical degrees of belief