/// <summary>
/// Add an Expression to constrain the results to be retrieved. Will be added with "OR"
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public virtual IFilter AddOr(AbstractExpression expression)
{
if (_junction == null)
{
_junction = Expression.Disjunction().Add(expression);
}
else
{
_junction = Expression.Disjunction().Add(_junction).Add(expression);
}
return this;
}