protected virtual QueryNode Visit(QueryNode node, AlgoliaQueryMapperState mappingState)
{
switch (node.NodeType)
{
case QueryNodeType.Take:
this.StripTake((TakeNode)node, mappingState.AdditionalQueryMethods);
return(this.Visit(((TakeNode)node).SourceNode, mappingState));
case QueryNodeType.Skip:
this.StripSkip((SkipNode)node, mappingState.AdditionalQueryMethods);
return(this.Visit(((SkipNode)node).SourceNode, mappingState));
case QueryNodeType.Constant:
return(this.VisitConstant((ConstantNode)node, mappingState));
case QueryNodeType.MatchAll:
return(this.VisitMatchAll((MatchAllNode)node, mappingState));
//return HandleTake((TakeNode)node);
//case QueryNodeType.Equal:
// return HandleEqual((EqualNode)node);
//case QueryNodeType.MatchAll:
// return string.Empty;
}
throw new NotSupportedException(string.Format("The query node type '{0}' is not supported in this context.", node.NodeType));
}
public override AlgoliaQuery MapQuery(IndexQuery query)
{
var mappingState = new AlgoliaQueryMapperState();
this.Visit(query.RootNode, mappingState);
var algoliaQuery = LoadFromState(mappingState);
return(new AlgoliaQuery(algoliaQuery));
}
protected virtual QueryNode VisitConstant(ConstantNode node, AlgoliaQueryMapperState mappingState)
{
var queryableType = typeof(System.Linq.IQueryable);
if (node.Type.IsAssignableTo(queryableType))
{
return(new MatchAllNode());
}
return(node);
}
private Query LoadFromState(AlgoliaQueryMapperState mappingState)
{
var query = new Query();
var takeMethod = mappingState.AdditionalQueryMethods.OfType <TakeMethod>().FirstOrDefault();
var skipMethod = mappingState.AdditionalQueryMethods.OfType <SkipMethod>().FirstOrDefault();
if (takeMethod != null)
{
int take = takeMethod.Count;
query.SetNbHitsPerPage(take);
if (skipMethod != null)
{
var skip = skipMethod.Count;
if (skip % take > 0)
{
throw new Exception("Skip and Take cannot be translated to number of pages");
}
var page = skip / take;
query.SetPage(page);
}
}
else
{
if (skipMethod != null)
{
throw new Exception("Skip cannot be used without Take.");
}
}
//foreach (var method in mappingState.AdditionalQueryMethods)
//{
// var takeMethod = method as TakeMethod;
// if (takeMethod != null)
// {
// query.SetNbHitsPerPage(takeMethod.Count);
// continue;
// }
// var skipMethod = method as SkipMethod;
// if (skipMethod != null)
// {
// query.SetPage(skipMethod.Count);
// continue;
// }
//}
return(query);
}
protected virtual QueryNode VisitMatchAll(MatchAllNode node, AlgoliaQueryMapperState mappingState)
{
return(new MatchAllNode());
}