scale.clef.expr
Class AggregateOp

java.lang.Object
  scale.common.Root
      scale.clef.Node
          scale.clef.expr.Expression
              scale.clef.expr.MonadicOp
                  scale.clef.expr.AggregateOp

All Implemented Interfaces:

AnnotationInterface, DisplayNode

Direct Known Subclasses:

SelectIndirectOp, SelectOp

public abstract class AggregateOp
extends MonadicOp

A class which represents a field/member selection, or aggregate, operator. For example, "." or "->".

$Id: AggregateOp.java,v 1.28 2006-12-19 16:09:27 burrill Exp $

Copyright 2006 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Constructor Summary

protected

AggregateOp(Type type, Expression struct, FieldDecl fd)

Method Summary

Node	getChild(int i) Return the specified AST child of this node.
FieldDecl	getField() Return the field of the structure that is referenced.
Expression	getStruct() Return the structure that is referenced.
int	numChildren() Return the number of AST children of this node.
void	visit(Predicate p) Process a node by calling its associated routine.

Methods inherited from class scale.clef.expr.MonadicOp

containsDeclaration, equivalent, getDeclList, getExpr, isSimpleOp, setExpr

Methods inherited from class scale.clef.expr.Expression

canonical, getConstantValue, getCoreType, getDisplayColorHint, getDisplayLabel, getDisplayShapeHint, getPointedToCore, getType, hasTrueFalseResult, setType, toStringSpecial

Methods inherited from class scale.clef.Node

getDecl, getSourceLineNumber, setAnnotationLevel, setReportLevel, setSourceLineNumber, toString, toString, toStringChildren

Methods inherited from class scale.common.Root

addAnnotation, allAnnotations, allMatchingAnnotations, getAnnotation, getDisplayName, getDisplayString, getNodeCount, getNodeID, hasAnnotation, hasEqualAnnotation, hashCode, removeAnnotation, removeAnnotations, toStringAnnotations, toStringClass, trace, trace, trace

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateOp

protected AggregateOp(Type type,
                      Expression struct,
                      FieldDecl fd)

Method Detail

getStruct

public final Expression getStruct()

Return the structure that is referenced.

getField

public final FieldDecl getField()

Return the field of the structure that is referenced.

visit

public void visit(Predicate p)

Description copied from class: Node

Process a node by calling its associated routine. See the "visitor" design pattern in Design Patterns: Elements of Reusable Object-Oriented Software by E. Gamma, et al, Addison Wesley, ISBN 0-201-63361-2.

Each class has a visit(Predicate p) method. For example, in class ABC:

   public void visit(Predicate p)
   {
     p.visitABC(this);
   }
 

and the class that implements Predicate has a method

   public void visitABC(Node n)
   {
     ABC a = (ABC) n;
     ...
   }
 

Thus, the class that implements Predicate can call

   n.visit(this);
 

where n is a Node sub-class without determining which specific sub-class n is. The visit pattern basically avoids implementing a large switch statement or defining different methods in each class for some purpose.

Overrides:

visit in class MonadicOp

See Also:

Predicate

getChild

public Node getChild(int i)

Return the specified AST child of this node.

Overrides:

getChild in class MonadicOp

numChildren

public int numChildren()

Return the number of AST children of this node.

Overrides:

numChildren in class MonadicOp