public override DbExpression Visit(DbJoinExpression expression)
{
EntityUtil.CheckArgumentNull(expression, "expression");
DbExpression result = expression;
DbExpressionBinding newLeft = this.VisitExpressionBinding(expression.Left);
DbExpressionBinding newRight = this.VisitExpressionBinding(expression.Right);
this.EnterScope(newLeft.Variable, newRight.Variable);
DbExpression newCondition = this.VisitExpression(expression.JoinCondition);
this.ExitScope();
if (!object.ReferenceEquals(expression.Left, newLeft) ||
!object.ReferenceEquals(expression.Right, newRight) ||
!object.ReferenceEquals(expression.JoinCondition, newCondition))
{
if (DbExpressionKind.InnerJoin == expression.ExpressionKind)
{
result = CqtBuilder.InnerJoin(newLeft, newRight, newCondition);
}
else if (DbExpressionKind.LeftOuterJoin == expression.ExpressionKind)
{
result = CqtBuilder.LeftOuterJoin(newLeft, newRight, newCondition);
}
else
{
Debug.Assert(expression.ExpressionKind == DbExpressionKind.FullOuterJoin, "DbJoinExpression had ExpressionKind other than InnerJoin, LeftOuterJoin or FullOuterJoin?");
result = CqtBuilder.FullOuterJoin(newLeft, newRight, newCondition);
}
}
NotifyIfChanged(expression, result);
return(result);
}