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com.trapezium.pattern
Class Visitor  

java.lang.Object
  com.trapezium.pattern.Visitor

All Implemented Interfaces:

java.io.Serializable

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public abstract class Visitor

extends java.lang.Object

implements java.io.Serializable

Abstract base class for all Visitor pattern objects. Concrete subclasses must define "visitObject" method, which returns true if the visited object's children are to be visitied, otherwise false.

Since:

1.0

Version:

1.12, 4 March 1998, infinite loop bug with some PROTOs, 1.0, 30 Dec 1997

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Field Summary
protected  com.trapezium.parse.TokenEnumerator	dataSource
(package private)  java.util.Hashtable	visited
int	visitLevel

 

Constructor Summary

Visitor(com.trapezium.parse.TokenEnumerator dataSource)           Class constructor

 

Method Summary
boolean	accepts(java.lang.Object a)           Template method, indicates whether an object is acceptable to the visitor.
boolean	acceptsPassOne(java.lang.Object a)
boolean	acceptsPassTwo(java.lang.Object a)
void	done()           Done visiting at this level.
com.trapezium.parse.TokenEnumerator	getDataSource()           Get the data source
boolean	isTwoPassVisitor()
(package private)  void	notifyCallback(java.lang.Object a)           call back to report progress
void	setDataSource(com.trapezium.parse.TokenEnumerator dataSource)           Set the data source for this visitor
java.lang.String	spacer()           visit level indentation
boolean	visit(java.lang.Object a)           Visit a particular object, subclass template method "visitObject" does actual visit, base class only tracks visit level.
abstract  boolean	visitObject(java.lang.Object a)           Template method for actually visiting an object.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

visitLevel

public int visitLevel

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dataSource

protected com.trapezium.parse.TokenEnumerator dataSource

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visited

java.util.Hashtable visited

Constructor Detail

Visitor

public Visitor(com.trapezium.parse.TokenEnumerator dataSource)

Class constructor

Method Detail

setDataSource

public void setDataSource(com.trapezium.parse.TokenEnumerator dataSource)

Set the data source for this visitor

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getDataSource

public com.trapezium.parse.TokenEnumerator getDataSource()

Get the data source

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spacer

public java.lang.String spacer()

visit level indentation

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visit

public boolean visit(java.lang.Object a)

Visit a particular object, subclass template method "visitObject" does actual visit, base class only tracks visit level.

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notifyCallback

void notifyCallback(java.lang.Object a)

call back to report progress

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done

public void done()

Done visiting at this level.

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accepts

public boolean accepts(java.lang.Object a)

Template method, indicates whether an object is acceptable to the visitor. This is assuming that all traversals start at acceptable objects, but from that point on, any object is acceptable only if the accepts method approves it. This is a default method, which approves all objects for the visitor. If a Visitor subclass needs to restrict the objects passed to "visitObject", this method is changed to only allow such objects.

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acceptsPassOne

public boolean acceptsPassOne(java.lang.Object a)

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acceptsPassTwo

public boolean acceptsPassTwo(java.lang.Object a)

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isTwoPassVisitor

public boolean isTwoPassVisitor()

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visitObject

public abstract boolean visitObject(java.lang.Object a)

Template method for actually visiting an object. Returns true if object children also get visited.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> trapezium >> [ pattern overview ]	PREV CLASS  NEXT CLASS
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