Encapsulavon cse341 programming cse341 programming

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Unformatted text preview: Lecture 1 Lecture 1 –  Will oPen access and manipulate subtrees directly Course Mechanics Course Mechanics •  Visitor object can also include local data (state) ML Variable Bindings shared bMthe visitor methods y L Variable Bindings Dan Grossman Dan Grossman public class TypeCheckVisitor extends NodeVisitor { Fall 2011 Fall 2011 public void visit(WhileNode s) { … } public void visit(IfNode s) { … } … private <local state>; // all methods can read/write this } Winter 2013 UW CSE 401 (Michael Ringenburg) 6 A Brief Word About EncapsulaVon CSE341: Programming CSE341: Programming Languages Languages •  A visitor object oPen needs to be able to access state iLecture ST nLecture 1 n the A1 odes Course Course Mechanics Mechanics –  Thus, ML Variable Bindings ore node state than may need to expose m Bindings ML Variable we might do to otherwise Dan Grossman Dan tradeoff –  Overall a good Grossman – bFall 2011 odularity eHer m Fall 2011 •  (plus, the nodes are relaVvely simple data objects anyway – not hiding much of anything) Winter 2013 UW CSE 401 (Michael Ringenburg) 7 References CSE341: Programming CSE341: Programming Languages Languages •  For Visitor paHern (and many others) Lecture 1 Lectur...
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