protected VfpExpression VisitJoin(VfpJoinExpression join)
{
VisitSource(join.Left);
WriteLine(Indentation.Same);
switch (join.ExpressionKind)
{
case VfpExpressionKind.CrossJoin:
Write(", ");
break;
case VfpExpressionKind.InnerJoin:
Write("INNER JOIN ");
break;
case VfpExpressionKind.LeftOuterJoin:
Write("LEFT OUTER JOIN ");
break;
default:
throw new NotSupportedException(join.ExpressionKind.ToString());
}
VisitSource(join.Right);
if (join.JoinCondition != null)
{
WriteLine(Indentation.Inner);
Write("ON ");
VisitPredicate(join.JoinCondition);
Indent(Indentation.Outer);
}
return(join);
}
public override VfpExpression Visit(VfpJoinExpression expression)
{
var result = base.Visit(expression);
expression = result as VfpJoinExpression;
if (expression == null)
{
return(result);
}
var filterExpression = expression.Left.Expression as VfpFilterExpression;
if (IsZeroEqualsZero(filterExpression))
{
expression = VfpExpressionBuilder.Join(expression.ExpressionKind, expression.ResultType, filterExpression.Input, expression.Right, expression.JoinCondition);
}
filterExpression = expression.Right.Expression as VfpFilterExpression;
if (IsZeroEqualsZero(filterExpression))
{
expression = VfpExpressionBuilder.Join(expression.ExpressionKind, expression.ResultType, expression.Left, filterExpression.Input, expression.JoinCondition);
}
return(expression);
}
public virtual VfpExpression Visit(VfpJoinExpression expression)
{
return(new VfpJoinExpression(expression.ExpressionKind,
expression.ResultType,
VisitVfpExpressionBinding(expression.Left),
VisitVfpExpressionBinding(expression.Right),
expression.JoinCondition.Accept(this)));
}
public override VfpExpression Visit(VfpJoinExpression expression)
{
throw new NotImplementedException();
}
