com.metamatrix.query.sql.visitor
Class AbstractSymbolMappingVisitor

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

Direct Known Subclasses:

StaticSymbolMappingVisitor, XMLNodeMappingVisitor

public abstract class AbstractSymbolMappingVisitor
extends ExpressionMappingVisitor

This class is used to update LanguageObjects by replacing one set of symbols with another. There is one abstract method which must be overridden to define how the mapping lookup occurs.

Constructor Summary

protected

AbstractSymbolMappingVisitor()

Method Summary

protected abstract Symbol	getMappedSymbol(Symbol symbol) Get the mapped symbol from the specified symbol.
java.util.List	getUnmappedSymbols() Get all symbols that were not mapped during life of visitor.
Expression	replaceExpression(Expression element)
void	visit(AllInGroupSymbol obj) Swap each ElementSymbol referenced by AllInGroupSymbol
void	visit(AllSymbol obj) Swap each ElementSymbol referenced by AllSymbol
void	visit(CriteriaSelector obj) Swap elements in CriteriaSelector
void	visit(Delete obj) This method updates the Delete object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.
void	visit(Insert obj) This method updates the Insert object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.
void	visit(SetClause obj)
void	visit(StoredProcedure obj) Swap name of stored proc and elements in stored procedure parameter expressions
void	visit(UnaryFromClause obj) Swap group in unary from clause.
void	visit(Update obj) This method updates the Update object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.

Methods inherited from class com.metamatrix.query.sql.visitor.ExpressionMappingVisitor

createAliases, getVariableValues, mapExpressions, setVariableValues, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

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

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSymbolMappingVisitor

protected AbstractSymbolMappingVisitor()

Method Detail

getMappedSymbol

protected abstract Symbol getMappedSymbol(Symbol symbol)

Get the mapped symbol from the specified symbol. Subclasses should implement this method to look up the target symbol from the specified symbol.

Parameters:

symbol - Source symbol

Returns:

Target symbol

visit

public void visit(Insert obj)

This method updates the Insert object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.

Overrides:

visit in class ExpressionMappingVisitor

Parameters:

obj - The Insert object to be updated with physical groups/elements

See Also:

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

visit

public void visit(Delete obj)

This method updates the Delete object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Delete object to be updated with physical groups

visit

public void visit(Update obj)

This method updates the Update object it receives as an argument by replacing the virtual groups/elements with their physical counterparts.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Update object to be updated with physical groups

visit

public void visit(SetClause obj)

Overrides:

visit in class ExpressionMappingVisitor

visit

public void visit(AllInGroupSymbol obj)

Swap each ElementSymbol referenced by AllInGroupSymbol

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

visit

public void visit(AllSymbol obj)

Swap each ElementSymbol referenced by AllSymbol

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

visit

public void visit(UnaryFromClause obj)

Swap group in unary from clause.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

visit

public void visit(StoredProcedure obj)

Swap name of stored proc and elements in stored procedure parameter expressions

Overrides:

visit in class ExpressionMappingVisitor

Parameters:

obj - Object to remap

visit

public void visit(CriteriaSelector obj)

Swap elements in CriteriaSelector

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Object to remap

replaceExpression

public Expression replaceExpression(Expression element)

Overrides:

replaceExpression in class ExpressionMappingVisitor

See Also:

ExpressionMappingVisitor.replaceExpression(com.metamatrix.query.sql.symbol.Expression)

getUnmappedSymbols

public java.util.List getUnmappedSymbols()

Get all symbols that were not mapped during life of visitor. If all symbols were mapped, this will return null.

Returns:

List of ElementSymbol and GroupSymbol that were unmapped OR null if all symbols mapped successfully