public Validator(CheckConstraintAttribute checkAttribute, Model model, _Boolean condition)
{
_checkAttribute = checkAttribute;
Model = model;
SourceColumns = GetSourceColumns(condition);
_condition = condition;
}
internal CaseExpression <TResult> WhenThen(_Boolean when, Column <TResult> then)
{
Debug.Assert(!object.ReferenceEquals(when, null));
Debug.Assert(then != null);
_when.Add(when);
_then.Add(then);
return(this);
}
/// <summary>
/// Construct CASE WHEN expression.
/// </summary>
/// <param name="when">The condition.</param>
/// <returns>The result.</returns>
public CaseWhen <TResult> When(_Boolean when)
{
when.VerifyNotNull(nameof(when));
return(new CaseWhen <TResult>(this, when));
}
internal CaseWhen(_Boolean when)
{
_when = when;
}
private static IColumns GetSourceColumns(_Boolean condition)
{
var expression = condition.Expression;
return(expression == null ? Columns.Empty : expression.BaseColumns);
}