ptolemy.data.expr

Class ASTPtUnionConstructNode

java.lang.Object

ptolemy.data.expr.ASTPtRootNode

ptolemy.data.expr.ASTPtUnionConstructNode

All Implemented Interfaces:

java.lang.Cloneable, Node

public class ASTPtUnionConstructNode
extends ASTPtRootNode

The parse tree created from the expression string consists of a hierarchy of node objects. This class represents union construction using the following syntax: {|foo = "abc"|}. The result of parsing and evaluating this expression is a union token with the label foo, and the corresponding value is a StringToken of value "abc". When using an expression to specify a union type, multiple labels are allowed: {|foo = string, bar = int|}, which is a union type with two alternatives: one labeled foo with type string, one labeled bar with type integer. FIXME: ambiguity

Since:

Ptolemy II 5.2

Version:

$Id$

Author:

Xiaojun Liu

See Also:

ASTPtRootNode, PtParser, Token

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Yellow (liuxj)

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.LinkedList	_labelNames The list of field names for the record.

Fields inherited from class ptolemy.data.expr.ASTPtRootNode

_children, _id, _isConstant, _parent, _ptToken, _ptType

Constructor Summary

Constructors

Constructor and Description
ASTPtUnionConstructNode(int id)
ASTPtUnionConstructNode(PtParser p, int id)

Method Summary

Modifier and Type	Method and Description
java.util.List	getLabelNames() Return the list of label names for this union construct.
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

_labelNames

protected java.util.LinkedList _labelNames

The list of field names for the record.

Constructor Detail

ASTPtUnionConstructNode

public ASTPtUnionConstructNode(int id)

ASTPtUnionConstructNode

public ASTPtUnionConstructNode(PtParser p,
                               int id)

Method Detail

getLabelNames

public java.util.List getLabelNames()

Return the list of label names for this union construct. The order of the list is not meaningful.

Returns:

The list of label names.

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.