csheets.core.formula.util
Class ReferenceFetcher

java.lang.Object
  csheets.core.formula.util.AbstractExpressionVisitor
      csheets.core.formula.util.ReferenceFetcher

All Implemented Interfaces:

ExpressionVisitor

public class ReferenceFetcher
extends AbstractExpressionVisitor

An expression visitor that collects the references from an expression.

Author:

Einar Pehrson

Constructor Summary

ReferenceFetcher()
Creates a new reference fetcher.

Method Summary

SortedSet<Reference>	getReferences(Expression expression) Traverses the given expression and returns the references that were found.
Object	visitReference(Reference reference) Adds the reference to the set.

Methods inherited from class csheets.core.formula.util.AbstractExpressionVisitor

visitBinaryOperation, visitFunctionCall, visitLiteral, visitUnaryOperation

Methods inherited from class java.lang.Object

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

Constructor Detail

ReferenceFetcher

public ReferenceFetcher()

Creates a new reference fetcher.

Method Detail

getReferences

public SortedSet<Reference> getReferences(Expression expression)

Traverses the given expression and returns the references that were found.

Parameters:

expression - the expression from which to fetch references

Returns:

the references that have been fetched

visitReference

public Object visitReference(Reference reference)

Adds the reference to the set.

Specified by:

visitReference in interface ExpressionVisitor

Overrides:

visitReference in class AbstractExpressionVisitor

Parameters:

reference - the reference to visit

Returns:

an arbitrary object