/// <summary>
/// create a bool expr as the root expr of the search unit.
/// </summary>
/// <param name="searchEntityUnit"></param>
/// <param name="searchPropParent"></param>
/// <returns></returns>
public SearchPropBoolExpr AddSearchPropBoolExpr(SearchEntity searchEntity, SearchBoolOperator oper)
{
if (searchEntity == null)
{
return(null);
}
// check that the criterion does not already exists
if (searchEntity.SearchPropRoot != null)
{
// a criterion already exists!
return(null);
}
SearchPropBoolExpr expr = new SearchPropBoolExpr();
expr.Operator = oper;
searchEntity.SearchPropRoot = expr;
return(expr);
}
/// <summary>
/// create a boolean expression.
/// </summary>
/// <param name="searchEntityUnit"></param>
/// <param name="searchPropParent"></param>
/// <returns></returns>
public SearchPropBoolExpr AddSearchPropBoolExpr(SearchEntity searchEntity, SearchPropBoolExpr boolExprParent, BoolExprOperand leftOrRight, SearchBoolOperator oper)
{
if (searchEntity == null)
{
return(null);
}
if (boolExprParent == null)
{
return(null);
}
// check that the criterion does not already exists
if (searchEntity.SearchPropRoot != null)
{
// a criterion already exists!
return(null);
}
// check that the criterion does not already exists
if (boolExprParent.GetLeftOrRight(leftOrRight) != null)
{
return(null);
}
SearchPropBoolExpr expr = new SearchPropBoolExpr();
expr.Operator = oper;
// set the prop operand to the left or to the right
boolExprParent.SetLeftOrRight(leftOrRight, expr);
return(expr);
}
