/// <summary>
/// Finds document IDs given a set of conditions.
/// </summary>
/// <param name="persistIndexLeaves"></param>
/// <param name="conditions"></param>
/// <param name="foundDocumentIds"></param>
private void MatchDocuments(int nestedLevel, PersistIndexExtent persistIndexLeaves, IndexSelection indexSelection, HashSet <Guid> globallyFoundDocumentIds)
{
/*
* HashSet<Guid> sessionFoundDocumentIds = new HashSet<Guid>();
*
* //TODO: This is broken, very broken.
* // We have scenarios where we have ANDs/ORs and nested ANDs/ORs.
* // We also have to support the same key being used in an OR (e.g. Color = 'BLACK' OR Color = 'Silver')
*
* foreach (var leaf in persistIndexLeaves.Leaves)
* {
* Condition condition = conditions[conditionOrdinal];
*
* if (condition.IsMatch(leaf.Key) == true)
* {
* if (conditions.Count == conditionOrdinal + 1)
* {
* //We have exausted all of our conditons, go ahead and skip to the document IDs.
* foreach (var documentId in leaf.Coalesce())
* {
* if (condition.ConditionType == ConditionType.None) //None means this is the first condition in a group.
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* else if (condition.ConditionType == ConditionType.And)
* {
* if (globallyFoundDocumentIds.Contains(documentId))
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* }
* else if (condition.ConditionType == ConditionType.Or)
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* else
* {
* throw new LeafSQLExceptionBase("Unsupported expression type.");
* }
*
* }
* }
* else if (leaf.IsBottom) //This is the bottom of the index, where the doucment IDs are stored.
* {
* //We have matched all of the index attributes.
* foreach (var documentId in leaf.DocumentIDs)
* {
* if (condition.ConditionType == ConditionType.None) //None means this is the first condition in a group.
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* else if (condition.ConditionType == ConditionType.And)
* {
* if (globallyFoundDocumentIds.Contains(documentId))
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* }
* else if (condition.ConditionType == ConditionType.Or)
* {
* sessionFoundDocumentIds.Add(documentId);
* }
* else
* {
* throw new LeafSQLExceptionBase("Unsupported expression type.");
* }
* }
* }
* else
* {
* //Match the next condition to the next lowest leaf level.
* MatchDocuments(nestedLevel++, leaf.Extent, indexSelection, globallyFoundDocumentIds);
* return;
* }
* }
* }
*/
}
/// <summary>
/// Finds document IDs given a set of conditions.
/// </summary>
/// <param name="indexPageCatalog"></param>
/// <param name="conditions"></param>
/// <returns></returns>
public HashSet <Guid> MatchDocuments(PersistIndexPageCatalog indexPageCatalog, IndexSelection indexSelection)
{
HashSet <Guid> globallyFoundDocumentIds = new HashSet <Guid>();
MatchDocuments(0, indexPageCatalog.Leaves, indexSelection, globallyFoundDocumentIds);
return(globallyFoundDocumentIds);
}