jtabwbx.prop.formula

Class FormulaFactory

java.lang.Object

jtabwbx.prop.formula.FormulaFactory

public class FormulaFactory
extends java.lang.Object

The factory building formulas.

Author:

Lorenzo Bossi

Field Summary

Fields

Modifier and Type	Field and Description
FormulaProposition	FALSE The formula representing the propositional variable FALSE.
FormulaProposition	TRUE The formula representing the propositional variable TRUE.

Constructor Summary

Constructors

Constructor and Description
FormulaFactory() Constructs an instance of the factory using "false" and "true" as names for true and false constants.
FormulaFactory(java.lang.String falseName, java.lang.String trueName) Constructs an instance of the factory using the specified names for true and false representation.

Method Summary

Modifier and Type	Method and Description
FormulaProposition	buildAtomic(java.lang.String name)
Formula	buildCompound(PropositionalConnective mainConnective, Formula... subFormulas) Builds the formula having the specified logical constant as main connective and the specified subformulas as direct subformulas.
Formula	buildFrom(BTFormula wff) Build an instance of the specified BTFormula.
Formula	buildFrom(Formula wff) Build an instance of the specified formula in this factory.
Formula	buildFrom(org.antlr.v4.runtime.tree.ParseTree parseTree) Build a formula from the specified parse-tree.
java.util.ArrayList<Formula>	generatedFormulas() Returns a copy of the list of formulas generated by this factory.
Formula	getByIndex(int index)
java.lang.String	getDescription()
FormulaProposition	getFalse() Returns the formula modelling the propositional constant FALSE.
BitSetOfFormulas	getGeneratedFormula() Returns the BitSetOfFormulas containing all the generated formulas.
BitSetOfFormulas	getGeneratedFormulasOfType(FormulaType type) Returns the BitSetOfFormulas containing all the generated formulas of the specified type.
FormulaProposition	getTrue() Returns the formula modelling the propositional constant TRUE.
BitSetOfFormulas	intuitionisticNonLocalFormulas() Returns the bitset containing the intuitionistic NON local formulas in this factory.
int	numberOfGeneratedFormulas() The number of distinct formulas generated by this factory.
void	setTranslateEquivalences(boolean b) If b is true equivalences (A <-> B) are built as (A -> B) & (B -> A).
void	setTranslateImplisesFalse(boolean b) If b is true implications of the kind A -> false are built as ~ A.
void	setTranslateNegations(boolean b) If b is true negated formulas (~ A) are built as (A -> FALSE).
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

FALSE

public final FormulaProposition FALSE

The formula representing the propositional variable FALSE.

TRUE

public final FormulaProposition TRUE

The formula representing the propositional variable TRUE.

Constructor Detail

FormulaFactory

public FormulaFactory(java.lang.String falseName,
                      java.lang.String trueName)

Constructs an instance of the factory using the specified names for true and false representation. Note that the names for true and false must be different, otherwise a ContractViolationImplementationError is thrown.

Parameters:

falseName - the name of the false constant.

trueName - the name of the true constant.

FormulaFactory

public FormulaFactory()

Constructs an instance of the factory using "false" and "true" as names for true and false constants.

Method Detail

numberOfGeneratedFormulas

public int numberOfGeneratedFormulas()

The number of distinct formulas generated by this factory.

Returns:

number of distinct formulas generated by this factory

generatedFormulas

public java.util.ArrayList<Formula> generatedFormulas()

Returns a copy of the list of formulas generated by this factory.

Returns:

a copy of the list of formulas generated by this factory.

getTrue

public FormulaProposition getTrue()

Returns the formula modelling the propositional constant TRUE.

Returns:

the formula representing TRUE.

getFalse

public FormulaProposition getFalse()

Returns the formula modelling the propositional constant FALSE.

Returns:

the formula representing FALSE.

getGeneratedFormula

public BitSetOfFormulas getGeneratedFormula()

Returns the BitSetOfFormulas containing all the generated formulas.

Returns:

the bitset of all generated formulas.

getGeneratedFormulasOfType

public BitSetOfFormulas getGeneratedFormulasOfType(FormulaType type)

Returns the BitSetOfFormulas containing all the generated formulas of the specified type.

Parameters:

type - the type of the formulas to return.

Returns:

the bitset of all generated formulas.

buildAtomic

public FormulaProposition buildAtomic(java.lang.String name)

buildCompound

public Formula buildCompound(PropositionalConnective mainConnective,
                             Formula... subFormulas)

Builds the formula having the specified logical constant as main connective and the specified subformulas as direct subformulas.

Parameters:

mainConnective - the main connective (a logical constant).

subFormulas - the direct subformulas.

Returns:

the corresponding compound formula.

getByIndex

public Formula getByIndex(int index)

buildFrom

public Formula buildFrom(Formula wff)

Build an instance of the specified formula in this factory.

Parameters:

wff - the formula to build.

Returns:

the instance of the formula in this factory.

buildFrom

public Formula buildFrom(BTFormula wff)

Build an instance of the specified BTFormula.

Parameters:

wff - the formula to build.

Returns:

the instance of the formula in this factory.

buildFrom

public Formula buildFrom(org.antlr.v4.runtime.tree.ParseTree parseTree)

Build a formula from the specified parse-tree.

Parameters:

parseTree - the parse tree.

Returns:

the instance of the formula in this factory.

intuitionisticNonLocalFormulas

public BitSetOfFormulas intuitionisticNonLocalFormulas()

Returns the bitset containing the intuitionistic NON local formulas in this factory. Do not modify.

Returns:

the set of intuitionistic local formulas in this factory.

getDescription

public java.lang.String getDescription()

setTranslateNegations

public void setTranslateNegations(boolean b)

If b is true negated formulas (~ A) are built as (A -> FALSE).

Parameters:

b - if true negations are translated

setTranslateEquivalences

public void setTranslateEquivalences(boolean b)

If b is true equivalences (A <-> B) are built as (A -> B) & (B -> A).

Parameters:

b - if true equivalences are translated

setTranslateImplisesFalse

public void setTranslateImplisesFalse(boolean b)

If b is true implications of the kind A -> false are built as ~ A.

Parameters:

b - if true the translation is applied.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object