Pandora.LogicParser.Formula
Class Var

java.lang.Object
  Pandora.LogicParser.Formula.Term
      Pandora.LogicParser.Formula.Var

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class Var
extends Term

The Var (a Variable)
Extends abstract class Term.

See Also:

Serialized Form

Constructor Summary

Var(java.lang.String name)
Constructs a Var(A variable)

Method Summary

void	addToSignature(PanSignature signature) This method adds this Var to the Variable List of the passed PanSignature IF it is not already in the signature.
boolean	clashes(Atom a) Returns true if the passed Atom clashes with this Var An Atom clashes with a Var if they have the same name.
java.lang.String	clashes(PanSignature signature) Returns a String of error message if this Var clashes with the passed PanSignature. A Var clashes with a PanSignature if it clashes with any of its Predicates,Constants,Functions or Variables. If this Var does not clash with the Signature, it is added to the Variable list of the signature and an empty String is returned.
boolean	clashes(Term t) Returns true if the passed Term(Constant/Function/Var) clashes with this Var. A Var clashes with a Term if they have the same name.
Var	clone() Returns a copy(clone) of this Var.
java.lang.String	display() Returns a String to display the Var.
boolean	equals(Term x) Returns true if the passed Term is equal to this Var A Term is equal to a Var if it is a Var and they have the same name.
java.lang.String	getName() Returns the name of the Var.
boolean	isIn(PanSignature signature) Returns true if this Var is in the Variable list of the passed PanSignature
void	setVars(Var v) This method adds Var v to the list of variables this Variable is bound to This will help the parser to prevent having nested variables I.e.
Term	sub(Term x, Term y) Substitutes all the occurences of Term x by Term y.

Methods inherited from class Pandora.LogicParser.Formula.Term

concatNoDup, getVars, isIn, isInVars

Methods inherited from class java.lang.Object

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

Constructor Detail

Var

public Var(java.lang.String name)

Constructs a Var(A variable)

Parameters:

name - String of the name fo the variable

Method Detail

getName

public java.lang.String getName()

Returns the name of the Var.

Specified by:

getName in class Term

sub

public Term sub(Term x,
                Term y)

Substitutes all the occurences of Term x by Term y.

Specified by:

sub in class Term

Parameters:

x - represents the Term to be substituted.

y - represents the Term used to substitute the Term x

display

public java.lang.String display()

Returns a String to display the Var.

Specified by:

display in class Term

equals

public boolean equals(Term x)

Returns true if the passed Term is equal to this Var
A Term is equal to a Var if it is a Var and they have the same name.

Overrides:

equals in class Term

Parameters:

t - Term represents the Term it is to be compared against.

isIn

public boolean isIn(PanSignature signature)

Returns true if this Var is in the Variable list of the passed PanSignature

Specified by:

isIn in class Term

Parameters:

signature - PanSignature represents the signature it is to be searched in.

setVars

public void setVars(Var v)

This method adds Var v to the list of variables this Variable is bound to
This will help the parser to prevent having nested variables
I.e. this variable will not be able to have the same name as the previous variables it is nested in.

Specified by:

setVars in class Term

Parameters:

v - Var represents the Var to be added to the list of this Var's variables.

clone

public Var clone()

Returns a copy(clone) of this Var.

Specified by:

clone in class Term

clashes

public boolean clashes(Atom a)

Returns true if the passed Atom clashes with this Var
An Atom clashes with a Var if they have the same name.

Parameters:

a - Atom represents the Atom to be compared against.

clashes

public boolean clashes(Term t)

Returns true if the passed Term(Constant/Function/Var) clashes with this Var.
A Var clashes with a Term if they have the same name.

Parameters:

t - Term Represents the Term to be compared against.

clashes

public java.lang.String clashes(PanSignature signature)

Returns a String of error message if this Var clashes with the passed PanSignature.
A Var clashes with a PanSignature if it clashes with any of its Predicates,Constants,Functions or Variables.
If this Var does not clash with the Signature, it is added to the Variable list of the signature and an empty String is returned.

Specified by:

clashes in class Term

Parameters:

signature - PanSignature Represents the signature to be compared against.

addToSignature

public void addToSignature(PanSignature signature)

This method adds this Var to the Variable List of the passed PanSignature IF it is not already in the signature.

Specified by:

addToSignature in class Term

Parameters:

signature - PanSignature represents the signature to add this Formula to.