private bool CoverAttributes(
ref Tile <FragmentQuery> rewriting,
Dictionary <MemberPath, FragmentQuery> attributeConditions)
{
foreach (FragmentQuery view in new HashSet <FragmentQuery>(rewriting.GetNamedQueries()))
{
foreach (MemberPath nonKey in QueryRewriter.NonKeys((IEnumerable <MemberPath>)view.Attributes))
{
this.CoverAttribute(nonKey, view, attributeConditions);
}
if (attributeConditions.Count == 0)
{
return(true);
}
}
Tile <FragmentQuery> tile = (Tile <FragmentQuery>)null;
foreach (FragmentQuery fragmentQuery in this._fragmentQueries)
{
foreach (MemberPath nonKey in QueryRewriter.NonKeys((IEnumerable <MemberPath>)fragmentQuery.Attributes))
{
if (this.CoverAttribute(nonKey, fragmentQuery, attributeConditions))
{
tile = tile == null ? (Tile <FragmentQuery>)QueryRewriter.CreateTile(fragmentQuery) : this._qp.Union(tile, (Tile <FragmentQuery>)QueryRewriter.CreateTile(fragmentQuery));
}
}
if (attributeConditions.Count == 0)
{
break;
}
}
if (attributeConditions.Count != 0)
{
return(false);
}
rewriting = this._qp.Join(rewriting, tile);
return(true);
}
private bool RewriteQuery(
Tile <FragmentQuery> toFill,
Tile <FragmentQuery> toAvoid,
out Tile <FragmentQuery> rewriting,
out IEnumerable <MemberPath> notCoveredAttributes,
bool isRelaxed)
{
notCoveredAttributes = (IEnumerable <MemberPath>) new List <MemberPath>();
FragmentQuery query1 = toFill.Query;
if (this._context.TryGetCachedRewriting(query1, out rewriting))
{
return(true);
}
IEnumerable <Tile <FragmentQuery> > relevantViews = this.GetRelevantViews(query1);
FragmentQuery query2 = query1;
if (!this.RewriteQueryCached((Tile <FragmentQuery>)QueryRewriter.CreateTile(FragmentQuery.Create(query1.Condition)), toAvoid, relevantViews, out rewriting))
{
if (!isRelaxed)
{
return(false);
}
query1 = FragmentQuery.Create((IEnumerable <MemberPath>)query1.Attributes, BoolExpression.CreateAndNot(query1.Condition, rewriting.Query.Condition));
if (this._qp.IsEmpty((Tile <FragmentQuery>)QueryRewriter.CreateTile(query1)) || !this.RewriteQueryCached((Tile <FragmentQuery>)QueryRewriter.CreateTile(FragmentQuery.Create(query1.Condition)), toAvoid, relevantViews, out rewriting))
{
return(false);
}
}
if (query1.Attributes.Count == 0)
{
return(true);
}
Dictionary <MemberPath, FragmentQuery> attributeConditions = new Dictionary <MemberPath, FragmentQuery>();
foreach (MemberPath nonKey in QueryRewriter.NonKeys((IEnumerable <MemberPath>)query1.Attributes))
{
attributeConditions[nonKey] = query1;
}
if (attributeConditions.Count == 0 || this.CoverAttributes(ref rewriting, attributeConditions))
{
this.GetUsedViewsAndRemoveTrueSurrogate(ref rewriting);
this._context.SetCachedRewriting(query2, rewriting);
return(true);
}
if (isRelaxed)
{
foreach (MemberPath nonKey in QueryRewriter.NonKeys((IEnumerable <MemberPath>)query1.Attributes))
{
FragmentQuery fragmentQuery;
attributeConditions[nonKey] = !attributeConditions.TryGetValue(nonKey, out fragmentQuery) ? query1 : FragmentQuery.Create(BoolExpression.CreateAndNot(query1.Condition, fragmentQuery.Condition));
}
if (this.CoverAttributes(ref rewriting, attributeConditions))
{
this.GetUsedViewsAndRemoveTrueSurrogate(ref rewriting);
this._context.SetCachedRewriting(query2, rewriting);
return(true);
}
}
notCoveredAttributes = (IEnumerable <MemberPath>)attributeConditions.Keys;
return(false);
}