Package net.sf.tweety.agents.dialogues.oppmodels

Class BeliefState

java.lang.Object

net.sf.tweety.agents.dialogues.oppmodels.BeliefState

Direct Known Subclasses:

T1BeliefState, T2BeliefState, T3BeliefState

public abstract class BeliefState
extends java.lang.Object

This abstract class encapsulates the common characteristics of a belief state for arguing agents.

Author:

Matthias Thimm, Tjitze Rienstra

Field Summary

Fields

Modifier and Type	Field	Description
private Extension	knownArguments	The set of arguments known by the agent.
private UtilityFunction<Argument,Extension>	utilityFunction	The utility function of the agent.

Constructor Summary

Constructors

Constructor	Description
BeliefState(Extension knownArguments, UtilityFunction<Argument,Extension> utilityFunction)	Creates a new belief-state with the given parameters.

Method Summary

Modifier and Type	Method	Description
abstract java.lang.Object	clone()
abstract java.lang.String	display()	Pretty print of this belief state.
protected abstract Pair<java.lang.Double,java.util.Set<ExecutableExtension>>	doMove(ArgumentationEnvironment env, DialogueTrace<Argument,Extension> trace)	Gives the set of all best next moves with their expected utility according to the belief state and the given trace.
boolean	equals(java.lang.Object obj)
protected Extension	getKnownArguments()	Returns the set of known arguments.
protected java.util.Set<ExecutableExtension>	getLegalMoves(ArgumentationEnvironment env, DialogueTrace<Argument,Extension> trace)	Returns the set of possible moves in the given situation and the given trace.
protected UtilityFunction<Argument,Extension>	getUtilityFunction()	Returns the utility function of this belief state.
int	hashCode()
private boolean	isLegal(ArgumentationEnvironment env, DialogueTrace<Argument,Extension> trace, java.util.Set<Argument> move)	Given the theory from the environment and the dialogue trace, returns true if move is a valid move.
ExecutableExtension	move(ArgumentationEnvironment env)	Gives the next best move according to the belief state and the given trace.
abstract void	update(DialogueTrace<Argument,Extension> trace)	Updates the current belief state accordingly to the given dialogue trace.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

knownArguments

private Extension knownArguments

The set of arguments known by the agent.

utilityFunction

private UtilityFunction<Argument,Extension> utilityFunction

The utility function of the agent.

Constructor Detail

BeliefState

public BeliefState(Extension knownArguments,
                   UtilityFunction<Argument,Extension> utilityFunction)

Creates a new belief-state with the given parameters.

Parameters:

knownArguments - the set of arguments known by the agent.

utilityFunction - the utility function of the agent.

Method Detail

isLegal

private boolean isLegal(ArgumentationEnvironment env,
                        DialogueTrace<Argument,Extension> trace,
                        java.util.Set<Argument> move)

Given the theory from the environment and the dialogue trace, returns true if move is a valid move.

Parameters:

env - the environment (gives access to universal Dung theory)

trace - the trace to be considered.

move - a possible move

Returns:

"true" if the given move is legal.

getLegalMoves

protected java.util.Set<ExecutableExtension> getLegalMoves(ArgumentationEnvironment env,
                                                           DialogueTrace<Argument,Extension> trace)

Returns the set of possible moves in the given situation and the given trace.

Parameters:

env - the environment (gives access to universal Dung theory)

trace - the trace to be considered.

Returns:

the set of possible moves in the given situation.

getKnownArguments

protected Extension getKnownArguments()

Returns the set of known arguments.

Returns:

the set of known arguments.

getUtilityFunction

protected UtilityFunction<Argument,Extension> getUtilityFunction()

Returns the utility function of this belief state.

Returns:

the utility function of this belief state.

update

public abstract void update(DialogueTrace<Argument,Extension> trace)

Updates the current belief state accordingly to the given dialogue trace.

Parameters:

trace - a dialogue trace

doMove

protected abstract Pair<java.lang.Double,java.util.Set<ExecutableExtension>> doMove(ArgumentationEnvironment env,
                                                                                          DialogueTrace<Argument,Extension> trace)

Gives the set of all best next moves with their expected utility according to the belief state and the given trace.

Parameters:

env - the environment (gives access to the current trace)

trace - the dialogue trace.

Returns:

the set of all best next moves with their expected utility

display

public abstract java.lang.String display()

Pretty print of this belief state.

Returns:

a string representation of this state.

move

public ExecutableExtension move(ArgumentationEnvironment env)

Gives the next best move according to the belief state and the given trace.

Parameters:

env - the environment (gives access to the current trace)

Returns:

a set of arguments.

clone

public abstract java.lang.Object clone()

Overrides:

clone in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object