com.lucidera.farrago
Class LucidDbSqlValidator.EquiJoinFinder

java.lang.Object
  org.eigenbase.sql.util.SqlBasicVisitor<Void>
      com.lucidera.farrago.LucidDbSqlValidator.EquiJoinFinder

All Implemented Interfaces:

SqlVisitor<Void>

Enclosing class:

LucidDbSqlValidator

private class LucidDbSqlValidator.EquiJoinFinder
extends SqlBasicVisitor<Void>

Visitor that walks a SqlNode expression tree looking for an equijoin between a source and target column.

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

private boolean	found
private SqlValidatorScope	scope
private SqlIdentifier	sourceCol
private SqlIdentifier	targetCol

Constructor Summary

LucidDbSqlValidator.EquiJoinFinder(SqlIdentifier targetCol, SqlIdentifier sourceCol, SqlValidatorScope scope)

Method Summary

private boolean	checkOperands(SqlNode op1, SqlNode op2) Determines if the first operand matches the target column and the second matches the source column
boolean	foundMatch()
Void	visit(SqlCall call) Visits a call to a SqlOperator.

Methods inherited from class org.eigenbase.sql.util.SqlBasicVisitor

visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

targetCol

private SqlIdentifier targetCol

sourceCol

private SqlIdentifier sourceCol

scope

private SqlValidatorScope scope

found

private boolean found

Constructor Detail

LucidDbSqlValidator.EquiJoinFinder

LucidDbSqlValidator.EquiJoinFinder(SqlIdentifier targetCol,
                                   SqlIdentifier sourceCol,
                                   SqlValidatorScope scope)

Method Detail

visit

public Void visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<Void>

Overrides:

visit in class SqlBasicVisitor<Void>

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)

checkOperands

private boolean checkOperands(SqlNode op1,
                              SqlNode op2)

Determines if the first operand matches the target column and the second matches the source column

Parameters:

op1 - first operand

op2 - second operand

Returns:

true if a match has been found

foundMatch

public boolean foundMatch()