/// <summary>
/// Called when visiting a <Where/> expression.
/// </summary>
/// <param name="expression">An instance of the <see cref="CamlWhereExpression"/> class representing the <Where/> expression.</param>
/// <returns>When overriden, returns an expression to replace the expression given in arguments.</returns>
protected virtual CamlExpression VisitWhereExpression(CamlWhereExpression expression)
{
CommonHelper.ConfirmNotNull(expression, "expression");
CamlExpression bodyExpression = VisitChecked(expression.Body, CamlExpressionType.Where);
if (bodyExpression != expression.Body)
{
switch (bodyExpression.Type)
{
case CamlExpressionType.WhereUnaryComparison:
case CamlExpressionType.WhereBinaryComparison:
case CamlExpressionType.WhereLogical:
return(new CamlWhereExpression((CamlWhereComparisonExpression)bodyExpression));
case CamlExpressionType.Where:
case CamlExpressionType.Empty:
return(bodyExpression);
}
throw new InvalidOperationException();
}
return(expression);
}
protected override CamlExpression VisitWhereExpression(CamlWhereExpression expression)
{
using (new WhereExpressionScope(this)) {
return(base.VisitWhereExpression(expression));
}
}
