private Predicate AddPredicate(Predicate where)
{
//if(_predicate == null || _predicate.GetType() == typeof(NullPredicate)) {
if (_predicate == null)
{
// 空文字、又はnullであれば構文木に何もしない
return(where);
}
if (where == null)
{
where = _predicate;
}
else
{
Predicate leftPredicate;
//if(AddWherePredicateVisitor.IsAndOnlyPredicate(where)) {
// // AND連言の場合
// leftPredicate = where;
//} else {
// // AND連言でない場合はWhere句の式を括弧で囲んでAND節をつなげる
// leftPredicate = new BracketedPredicate(where);
//}
if (where.GetType() == typeof(OrPredicate))
{
// WHERE句が、A OR Bの場合(A OR B)のように括弧で囲む
leftPredicate = new BracketedPredicate(where);
}
else
{
// WHERE句が、A AND Bの場合またはAのように2項演算でない場合、括弧で囲まない
leftPredicate = where;
}
// 追加するPredicateがAND連言でない場合は括弧で囲む
Predicate rightPredicate;
//if(AddWherePredicateVisitor.IsAndOnlyPredicate(_predicate)) {
// rightPredicate = _predicate;
//} else {
// rightPredicate = new BracketedPredicate(_predicate);
//}
if (_predicate.GetType() == typeof(OrPredicate))
{
// OR演算式の場合は式全体を括弧で囲んでAND節をつなげる
rightPredicate = new BracketedPredicate(_predicate);
}
else
{
rightPredicate = _predicate;
}
where = new AndPredicate(leftPredicate, rightPredicate);
}
return(where);
}
public override void VisitAfter(AndPredicate andPredicate)
{
if (IsPlaceHolderPredicate(andPredicate.Left))
{
andPredicate.Left = PlaceInAnd((PlaceHolderPredicate)andPredicate.Left);
}
if (IsPlaceHolderPredicate(andPredicate.Right))
{
andPredicate.Right = PlaceInAnd((PlaceHolderPredicate)andPredicate.Right);
}
}
private Predicate ConcatConditions(Stack <Predicate> conditionStack)
{
var e = conditionStack.GetEnumerator();
if (!e.MoveNext())
{
return(null);
}
Predicate ret = e.Current;
while (e.MoveNext())
{
ret = new AndPredicate(e.Current, ret);
}
return(ret);
}
virtual public void Visit(AndPredicate andPredicate)
{
}
virtual public void VisitBefore(AndPredicate andPredicate)
{
}
public override void VisitAfter(AndPredicate andPredicate)
{
}
public override void VisitAfter(AndPredicate andPredicate)
{
--_predicateLevel;
}
public override void VisitBefore(AndPredicate andPredicate)
{
++_predicateLevel;
}
public void Visit(AndPredicate andPredicate)
{
_visitor.Visit(andPredicate);
}
public void VisitAfter(AndPredicate andPredicate)
{
_visitor.VisitAfter(andPredicate);
}
public void VisitBefore(AndPredicate andPredicate)
{
_visitor.VisitBefore(andPredicate);
}
