net.sf.tweety.action.signature

Class ActionSignature

java.lang.Object

net.sf.tweety.commons.Signature

net.sf.tweety.logics.fol.syntax.FolSignature

net.sf.tweety.action.signature.ActionSignature

public class ActionSignature
extends net.sf.tweety.logics.fol.syntax.FolSignature

This class represents an action signature consisting of a set of fluent names and a set of action names. These are represented by first order predicates to allow for the simple implementation of a grounding mechanism.

Author:

Sebastian Homann

Constructor Summary

Constructors

Constructor and Description
ActionSignature() Creates an empty signature
ActionSignature(Collection<?> c) Creates a signature with the given objects (should be sorts, constants, predicates or formulas).
ActionSignature(net.sf.tweety.logics.fol.syntax.FolFormula f) Creates a new Action Signature for a single first order formula.

Method Summary

Modifier and Type	Method and Description
boolean	containsActionName(FolActionName actionName) Returns true iff the given actionName is contained in this signature.
boolean	containsActionName(String actionName) Returns true iff the given actionName is contained in this action signature.
boolean	containsFluentName(FolFluentName fluentName) Returns true iff the given fluentName is contained in this signature.
boolean	containsFluentName(String fluentName) Returns true iff the given fluentName is contained in this action signature.
boolean	containsPredicate(net.sf.tweety.logics.commons.syntax.Predicate predicate) Returns true iff the given predicate is contained in this signature.
FolActionName	getActionName(String action) Returns the action name predicate with the given name if one exists, null otherwise.
Set<FolActionName>	getActionNames() Returns the set of action names contained in this action signature.
Set<net.sf.tweety.logics.fol.syntax.FOLAtom>	getAllGroundedActionNameAtoms() Returns the set of all possible grounded atoms in this signature on the basis of all action name predicates contained.
Set<net.sf.tweety.logics.fol.syntax.FOLAtom>	getAllGroundedFluentAtoms() Returns the set of all possible grounded atoms in this signature on the basis of all fluent predicates contained.
FolFluentName	getFluentName(String fluentName) Returns the fluent name predicate with the given name if one exists, null otherwise.
Set<FolFluentName>	getFluentNames() Returns the set of fluent names contained in this action signature.
boolean	isValidFormula(net.sf.tweety.commons.Formula f) Checks, if a given formula is valid in the sense of an action description, containing only predicates that are either fluentnames or actionnames and containing neither quantifiers nor functions.
String	toString()

Methods inherited from class net.sf.tweety.logics.fol.syntax.FolSignature

add, addAll, addSignature, containsConstant, containsFunctor, containsPredicate, containsSort, equals, getConstant, getConstants, getFunctor, getFunctors, getPredicate, getPredicates, getSort, getSorts, hashCode, isOverlappingSignature, isRepresentable, isSubSignature

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ActionSignature

public ActionSignature()

Creates an empty signature

ActionSignature

public ActionSignature(Collection<?> c)
                throws IllegalArgumentException

Creates a signature with the given objects (should be sorts, constants, predicates or formulas).

Parameters:

c - a collection of items to be added.

Throws:

IllegalArgumentException - if at least one of the given objects is neither a constant, a sort, a predicate or a formula.

ActionSignature

public ActionSignature(net.sf.tweety.logics.fol.syntax.FolFormula f)

Creates a new Action Signature for a single first order formula.

Parameters:

f -

Method Detail

getActionNames

public Set<FolActionName> getActionNames()

Returns the set of action names contained in this action signature.

Returns:

the set of action names contained in this action signature.

getFluentNames

public Set<FolFluentName> getFluentNames()

Returns the set of fluent names contained in this action signature.

Returns:

the set of fluent names contained in this action signature.

isValidFormula

public boolean isValidFormula(net.sf.tweety.commons.Formula f)

Checks, if a given formula is valid in the sense of an action description, containing only predicates that are either fluentnames or actionnames and containing neither quantifiers nor functions.

Parameters:

f - the formula in question.

Returns:

true iff the given formula is a FolFormula, contains only atoms with fluent or action-predicates and contains no quantifiers or functors.

toString

public String toString()

Overrides:

toString in class Object

containsActionName

public boolean containsActionName(String actionName)

Returns true iff the given actionName is contained in this action signature.

Parameters:

actionName - an action name

Returns:

true iff actionName is contained in this signature.

containsFluentName

public boolean containsFluentName(String fluentName)

Returns true iff the given fluentName is contained in this action signature.

Parameters:

fluentName - a fluent name

Returns:

true iff fluentName is contained in this action signature.

getActionName

public FolActionName getActionName(String action)

Returns the action name predicate with the given name if one exists, null otherwise.

Parameters:

action - an action

Returns:

the actionName predicate with the given name or null

getFluentName

public FolFluentName getFluentName(String fluentName)

Returns the fluent name predicate with the given name if one exists, null otherwise.

Parameters:

fluentName -

Returns:

the fluent predicate with the given name or null

containsActionName

public boolean containsActionName(FolActionName actionName)

Returns true iff the given actionName is contained in this signature.

Parameters:

actionName -

Returns:

true iff the given actionName is contained in this signature.

containsFluentName

public boolean containsFluentName(FolFluentName fluentName)

Returns true iff the given fluentName is contained in this signature.

Parameters:

fluentName -

Returns:

true iff the given fluentName is contained in this signature.

containsPredicate

public boolean containsPredicate(net.sf.tweety.logics.commons.syntax.Predicate predicate)

Returns true iff the given predicate is contained in this signature.

Parameters:

predicate -

Returns:

true iff the given predicate is contained in this signature.

getAllGroundedFluentAtoms

public Set<net.sf.tweety.logics.fol.syntax.FOLAtom> getAllGroundedFluentAtoms()

Returns the set of all possible grounded atoms in this signature on the basis of all fluent predicates contained.

Returns:

the set of all possible grounded fluent atoms.

getAllGroundedActionNameAtoms

public Set<net.sf.tweety.logics.fol.syntax.FOLAtom> getAllGroundedActionNameAtoms()

Returns the set of all possible grounded atoms in this signature on the basis of all action name predicates contained.

Returns:

the set of all possible grounded action atoms.