/**
* Intersect(A,Intersect(B,C)) -> Intersect(A,B,C)
* If any of the sources of the intersection are also intersections,
* collapses their sources into the current intersection.
*/
private void ExpandIntersections(ArrayList newPredicateList, ref bool optimized)
{
for (int i = 0; i < _sourcePredicates.Length; i++)
{
IntersectionPredicate sourceIntersection = _sourcePredicates [i] as IntersectionPredicate;
if (sourceIntersection != null)
{
newPredicateList.AddRange(sourceIntersection._sourcePredicates);
optimized = true;
}
else
{
newPredicateList.Add(_sourcePredicates [i]);
}
}
}
public IResourceList Intersect(IResourceList other, bool allowMerge)
{
if (other == null)
{
return(this);
}
ResourceList otherList = (ResourceList)other;
if (_predicate.Equals(otherList.Predicate))
{
Trace.WriteLine("Attempt to intersect lists with equal predicates " + _predicate.ToString());
return(this);
}
if (allowMerge)
{
ResourceList destList = this;
ResourceList srcList = otherList;
IntersectionPredicate predicate = null;
if (_list == null)
{
predicate = _predicate as IntersectionPredicate;
}
if (predicate == null && otherList._list == null)
{
srcList = this;
destList = otherList;
predicate = otherList._predicate as IntersectionPredicate;
}
if (predicate != null)
{
predicate.AddSource(srcList.Predicate);
return(MergeListData(destList, srcList));
}
}
IntersectionPredicate pred = new IntersectionPredicate(_predicate, otherList._predicate);
ResourceList result = new ResourceList(pred, _isLive || otherList.IsLive);
return(MergeListData(result, this, otherList));
}