Pandora.NDRules
Class IffIntro

java.lang.Object
  Pandora.NDRules.NDRule
      Pandora.NDRules.IffIntro

public class IffIntro
extends NDRule

Implements the Iff Introduction rule.
Extends abstract class Rule.

Field Summary

Fields inherited from class Pandora.NDRules.NDRule

firstLine

Constructor Summary

IffIntro(ProofBox proof)
Constructs an IffIntro.

Method Summary

void	addLine(ProofLine line) Adds the extra lines to the rule once the input line has been added.
void	apply() Called by the RuleController to apply the rule.
void	check() Called by the RuleController to check the input lines to the rule.
protected Formula	getNewFormula(java.lang.String oldFormula, java.lang.String message) Takes as input a formula that was rejected because its atoms were not in the signature of the proof.
boolean	haveAll() Returns true if the rule has all of the required input lines Only the first line is required so this method returns true.

Methods inherited from class Pandora.NDRules.NDRule

addInputLine, checkSignature

Methods inherited from class java.lang.Object

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

Constructor Detail

IffIntro

public IffIntro(ProofBox proof)

Constructs an IffIntro.

Parameters:

proof - ProofBox representing in which box the rule is being applied

Method Detail

addLine

public void addLine(ProofLine line)

Adds the extra lines to the rule once the input line has been added.
This is an empty method as only one line is required to implement this rule.

Specified by:

addLine in class NDRule

Parameters:

line - ProofLine which has been selected

haveAll

public boolean haveAll()

Returns true if the rule has all of the required input lines
Only the first line is required so this method returns true.

Specified by:

haveAll in class NDRule

check

public void check()
           throws java.lang.Exception

Called by the RuleController to check the input lines to the rule.

Specified by:

check in class NDRule

Throws:

java.lang.Exception

apply

public void apply()
           throws java.lang.Exception

Called by the RuleController to apply the rule.
Applies backwards iff introduction.

Specified by:

apply in class NDRule

Throws:

java.lang.Exception

getNewFormula

protected Formula getNewFormula(java.lang.String oldFormula,
                                java.lang.String message)
                         throws java.lang.Exception

Takes as input a formula that was rejected because its atoms were not in the signature of the proof.
Creates a dialog box asking the user to input a new formula.
Parses the new formula and gives the user options of what to do if the atoms are not in the signature.
The options are the add the atoms to the signature, cancel the rule or to type a new formula.
Returns a formula entered by the user, whose atoms are now in the signature of the proof.

Overrides:

getNewFormula in class NDRule

Parameters:

oldFormula - the formula with atoms that are not in the signature of the proof

Throws:

java.lang.Exception