de.rwth.i2.attestor

Class LTLFormula

java.lang.Object

de.rwth.i2.attestor.LTLFormula

public class LTLFormula
extends Object

Holds an LTL formula, its corresponding AST obtained from parsing, and its formula walker. The class provides formula walking capabilities, that already tailored to the tableau method for model checking.

Author:

christina

Constructor Summary

Constructors

Constructor and Description
LTLFormula(String formula)

Method Summary

Modifier and Type	Method and Description
boolean	equals(LTLFormula formula)
List<String>	getApList()
Start	getASTRoot()
String	getFormulaString()
FormulaWalker	getFormulaWalker()
ArrayList<Node>	getTableauSubformulae(Node node) This procedure returns the subformulae of the formula associated with node, that are to be considered by the tableau method in the current step.
int	hashCode()
void	toPNF() This method transforms the formula into PNF (i.e.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

LTLFormula

public LTLFormula(String formula)
           throws ParserException,
                  LexerException,
                  IOException

Throws:

ParserException

LexerException

IOException

Method Detail

getTableauSubformulae

public ArrayList<Node> getTableauSubformulae(Node node)

This procedure returns the subformulae of the formula associated with node, that are to be considered by the tableau method in the current step. Note that the successor list of the tree walker is cleared each time this method is called in order to obtain only the direct subformulae of the input node.

Parameters:

node - the AST node associated to the formula currently in process

Returns:

the list of subformulae, this list contains the subformula in the order of appearance and, in case the input node corresponds to an until or release formula, the unrolled formula as last element

getApList

public List<String> getApList()

toString

public String toString()

Overrides:

toString in class Object

getASTRoot

public Start getASTRoot()

getFormulaWalker

public FormulaWalker getFormulaWalker()

getFormulaString

public String getFormulaString()

equals

public boolean equals(LTLFormula formula)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toPNF

public void toPNF()

This method transforms the formula into PNF (i.e. adapts the formulae's AST accordingly).