net.sf.tweety.logics.fol.semantics

Class HerbrandInterpretation

java.lang.Object

net.sf.tweety.commons.AbstractInterpretation

net.sf.tweety.commons.InterpretationSet<FOLAtom>

net.sf.tweety.logics.fol.semantics.HerbrandInterpretation

All Implemented Interfaces:

java.lang.Iterable<FOLAtom>, java.util.Collection<FOLAtom>, Interpretation

public class HerbrandInterpretation
extends InterpretationSet<FOLAtom>

A Herbrand interpretation is an interpretation for a first-order signature, stating all ground atoms that are true in the interpretation.
NOTE: We only allow Herbrand interpretations for signatures without function symbols.

Author:

Matthias Thimm

Constructor Summary

Constructors

Constructor and Description
HerbrandInterpretation() Creates a new empty Herbrand interpretation
HerbrandInterpretation(java.util.Collection<? extends FOLAtom> atoms) Creates a new Herbrand interpretation with the given set of atoms

Method Summary

Modifier and Type	Method and Description
HerbrandInterpretation	exchange(java.util.Map<Term<?>,Term<?>> mapping) For every mapping t1 -> t2, this method substitutes every occurrence of "t1" by "t2" and vice versa and returns the new interpretation
HerbrandInterpretation	exchange(Term<?> t1, Term<?> t2) Substitutes every occurrence of "t1" by "t2" and vice versa and returns the new interpretation.
boolean	isSyntacticallyEquivalent(HerbrandInterpretation other, java.util.Collection<? extends java.util.Collection<? extends Constant>> equivalenceClasses) Checks whether this interpretation is syntactically equivalent to the given interpretation and the given equivalence classes, i.e.
boolean	satisfies(BeliefBase beliefBase) Checks whether this interpretation satisfies the given knowledge base.
boolean	satisfies(Formula formula) Checks whether this Herbrand interpretation satisfies the given formula.
boolean	satisfies(java.util.Set<FolFormula> formulas) Checks whether this Herbrand interpretation satisfies each of the formulas in the given set of first-order formulas.
java.lang.String	toString()

Methods inherited from class net.sf.tweety.commons.InterpretationSet

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Methods inherited from class net.sf.tweety.commons.AbstractInterpretation

satisfies

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

HerbrandInterpretation

public HerbrandInterpretation()

Creates a new empty Herbrand interpretation

HerbrandInterpretation

public HerbrandInterpretation(java.util.Collection<? extends FOLAtom> atoms)

Creates a new Herbrand interpretation with the given set of atoms

Parameters:

atoms - the set of true atoms in this Herbrand interpretation.

Method Detail

satisfies

public boolean satisfies(Formula formula)
                  throws java.lang.IllegalArgumentException

Checks whether this Herbrand interpretation satisfies the given formula.

Parameters:

formula - a formula.

Returns:

"true" if this interpretation satisfies "f".

Throws:

java.lang.IllegalArgumentException - if "f" is not closed.

isSyntacticallyEquivalent

public boolean isSyntacticallyEquivalent(HerbrandInterpretation other,
                                         java.util.Collection<? extends java.util.Collection<? extends Constant>> equivalenceClasses)

Checks whether this interpretation is syntactically equivalent to the given interpretation and the given equivalence classes, i.e. whether this interpretation can be translated to the other one by substituting constants from the same equivalence classes

Parameters:

other - a Herbrand interpretation.

equivalenceClasses - a set of sets of constants.

Returns:

"true" iff the two interpretations are syntactically equivalent.

satisfies

public boolean satisfies(java.util.Set<FolFormula> formulas)
                  throws java.lang.IllegalArgumentException

Checks whether this Herbrand interpretation satisfies each of the formulas in the given set of first-order formulas.

Parameters:

formulas - a set of first-order formulas.

Returns:

"true" if this interpretation satisfies the given set of formulas.

Throws:

java.lang.IllegalArgumentException - if at least one formula does not correspond to the expected language.

satisfies

public boolean satisfies(BeliefBase beliefBase)
                  throws java.lang.IllegalArgumentException

Description copied from interface: Interpretation

Checks whether this interpretation satisfies the given knowledge base.

Parameters:

beliefBase - a knowledge base.

Returns:

"true" if this interpretation satisfies the given knowledge base.

Throws:

java.lang.IllegalArgumentException - IllegalArgumentException if the knowledgebase does not correspond to the expected language.

exchange

public HerbrandInterpretation exchange(Term<?> t1,
                                       Term<?> t2)

Substitutes every occurrence of "t1" by "t2" and vice versa and returns the new interpretation.

Parameters:

t1 - a term.

t2 - a term.

Returns:

a Herbrand interpretation

exchange

public HerbrandInterpretation exchange(java.util.Map<Term<?>,Term<?>> mapping)

For every mapping t1 -> t2, this method substitutes every occurrence of "t1" by "t2" and vice versa and returns the new interpretation

Parameters:

mapping - a mapping of terms.

Returns:

a Herbrand interpretation.

toString

public java.lang.String toString()

Overrides:

toString in class InterpretationSet<FOLAtom>