Package ptolemy.data.expr

Class ASTPtRelationalNode

java.lang.Object

ptolemy.data.expr.ASTPtRootNode

ptolemy.data.expr.ASTPtRelationalNode

All Implemented Interfaces:

java.lang.Cloneable, Node

public class ASTPtRelationalNode
extends ASTPtRootNode

The parse tree created from the expression string consists of a hierarchy of node objects. This class represents relational operator(>, ≥, <, ≤, ==, !=) nodes in the parse tree.

Each node of this type has exactly two children. The resolved type is a BooleanToken.

Since:

Ptolemy II 0.2

Version:

$Id$

Author:

Neil Smyth

See Also:

ASTPtRootNode, PtParser, Token

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Yellow (nsmyth)

Field Summary

Fields

Modifier and Type	Field	Description
protected Token	_lexicalToken

Fields inherited from class ptolemy.data.expr.ASTPtRootNode

_children, _id, _isConstant, _parent, _ptToken, _ptType

Constructor Summary

Constructors

Constructor	Description
ASTPtRelationalNode(int id)
ASTPtRelationalNode(PtParser p, int id)

Method Summary

Modifier and Type	Method	Description
Token	getOperator()	Return the lexical token representing the operation of this node.
boolean	isCongruent(ASTPtRootNode node, java.util.Map renaming)	Return true if this node is (hierarchically) congruent to the given node, under the given renaming of bound identifiers.
void	visit(ParseTreeVisitor visitor)	Traverse this node with the given visitor.

Methods inherited from class ptolemy.data.expr.ASTPtRootNode

clone, displayParseTree, evaluateParseTree, getToken, getType, isConstant, isEvaluated, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, setConstant, setToken, setType, toString, toString

Methods inherited from class java.lang.Object

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

Field Detail

_lexicalToken

protected Token _lexicalToken

Constructor Detail

ASTPtRelationalNode

public ASTPtRelationalNode(int id)

ASTPtRelationalNode

public ASTPtRelationalNode(PtParser p,
                           int id)

Method Detail

getOperator

public Token getOperator()

Return the lexical token representing the operation of this node.

Returns:

the token that represents the operation of this node.

isCongruent

public boolean isCongruent(ASTPtRootNode node,
                           java.util.Map renaming)

Return true if this node is (hierarchically) congruent to the given node, under the given renaming of bound identifiers. Derived classes should extend this method to add additional necessary congruency checks.

Overrides:

isCongruent in class ASTPtRootNode

Parameters:

node - The node to compare to.

renaming - A map from String to String that gives a renaming from identifiers in this node to identifiers in the given node.

Returns:

True if the node is congruent.

visit

public void visit(ParseTreeVisitor visitor)
           throws IllegalActionException

Traverse this node with the given visitor.

Overrides:

visit in class ASTPtRootNode

Parameters:

visitor - The visitor.

Throws:

IllegalActionException - Always thrown in this base class the visit() method is not implemented here.