com.metamatrix.query.sql.visitor
Class ExpressionMappingVisitor

java.lang.Object
  com.metamatrix.query.sql.LanguageVisitor
      com.metamatrix.query.sql.visitor.ExpressionMappingVisitor

Direct Known Subclasses:

AbstractSymbolMappingVisitor, CorrelatedVariableSubstitutionVisitor, EvaluateExpressionVisitor, ReferenceBindingReplacerVisitor, VariableSubstitutionVisitor

public class ExpressionMappingVisitor
extends LanguageVisitor

It is important to use a Post Navigator with this class, otherwise a replacement containing itself will not work

Constructor Summary

ExpressionMappingVisitor(java.util.Map symbolMap)
Constructor for ExpressionMappingVisitor.

Method Summary

protected boolean	createAliases()
protected java.util.Map	getVariableValues()
static void	mapExpressions(LanguageObject obj, java.util.Map exprMap) Take a language object (currently only criteria and expressions will be properly mapped) and use the map to swap out expressions with new expressions.
static void	mapExpressions(LanguageObject obj, java.util.Map exprMap, boolean preOrder)
Expression	replaceExpression(Expression element)
protected void	setVariableValues(java.util.Map variableValues)
void	visit(AggregateSymbol obj)
void	visit(AliasSymbol obj)
void	visit(AssignmentStatement obj)
void	visit(BetweenCriteria obj)
void	visit(CaseExpression obj)
void	visit(CompareCriteria obj)
void	visit(DependentSetCriteria obj)
void	visit(DynamicCommand obj)
void	visit(ExpressionSymbol expr)
void	visit(Function obj)
void	visit(GroupBy obj) Swap each ElementSymbol in GroupBy (other symbols are ignored).
void	visit(Insert obj)
void	visit(IsNullCriteria obj)
void	visit(Limit obj)
void	visit(MatchCriteria obj)
void	visit(OrderBy obj) Swap each SingleElementSymbol in OrderBy (other symbols are ignored).
void	visit(SearchedCaseExpression obj)
void	visit(Select obj)
void	visit(SetClause obj)
void	visit(SetCriteria obj)
void	visit(StoredProcedure obj)
void	visit(SubqueryCompareCriteria obj)
void	visit(SubquerySetCriteria obj)

Methods inherited from class com.metamatrix.query.sql.LanguageVisitor

setAbort, shouldAbort, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionMappingVisitor

public ExpressionMappingVisitor(java.util.Map symbolMap)

Constructor for ExpressionMappingVisitor.

Parameters:

symbolMap - Map of ElementSymbol to Expression

Method Detail

createAliases

protected boolean createAliases()

visit

public void visit(Select obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(AliasSymbol obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(com.metamatrix.query.sql.symbol.AliasSymbol)

visit

public void visit(ExpressionSymbol expr)

Overrides:

visit in class LanguageVisitor

visit

public void visit(BetweenCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(BetweenCriteria)

visit

public void visit(CaseExpression obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(CompareCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(CompareCriteria)

visit

public void visit(Function obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(Function)

visit

public void visit(IsNullCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(IsNullCriteria)

visit

public void visit(MatchCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(MatchCriteria)

visit

public void visit(SearchedCaseExpression obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(SetCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(SetCriteria)

visit

public void visit(DependentSetCriteria obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(SubqueryCompareCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(com.metamatrix.query.sql.lang.SubqueryCompareCriteria)

visit

public void visit(SubquerySetCriteria obj)

Overrides:

visit in class LanguageVisitor

See Also:

LanguageVisitor.visit(com.metamatrix.query.sql.lang.SubquerySetCriteria)

replaceExpression

public Expression replaceExpression(Expression element)

visit

public void visit(StoredProcedure obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(AggregateSymbol obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(GroupBy obj)

Swap each ElementSymbol in GroupBy (other symbols are ignored).

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

visit

public void visit(OrderBy obj)

Swap each SingleElementSymbol in OrderBy (other symbols are ignored).

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

visit

public void visit(Limit obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(DynamicCommand obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(SetClause obj)

Overrides:

visit in class LanguageVisitor

mapExpressions

public static void mapExpressions(LanguageObject obj,
                                  java.util.Map exprMap)

Take a language object (currently only criteria and expressions will be properly mapped) and use the map to swap out expressions with new expressions. If an expression is not found in the map, it is not swapped. The object is modified in place, so is not returned.

Parameters:

obj - Language object

exprMap - Expression map, Expression to Expression

mapExpressions

public static void mapExpressions(LanguageObject obj,
                                  java.util.Map exprMap,
                                  boolean preOrder)

setVariableValues

protected void setVariableValues(java.util.Map variableValues)

getVariableValues

protected java.util.Map getVariableValues()

visit

public void visit(AssignmentStatement obj)

Overrides:

visit in class LanguageVisitor

Since:

5.0

See Also:

LanguageVisitor.visit(com.metamatrix.query.sql.proc.AssignmentStatement)

visit

public void visit(Insert obj)

Overrides:

visit in class LanguageVisitor

Since:

5.0

See Also:

LanguageVisitor.visit(com.metamatrix.query.sql.lang.Insert)