/// <summary>
/// Gets a subset of search results to search in based on the current criteria
/// </summary>
/// <param name="criteriaSet"></param>
/// <returns>Search subset</returns>
protected virtual SearchSubset GetSearchSubset(SearchCriteriaSet criteriaSet)
{
ICacheable finalEntry = null;
int hashSum = criteriaSet.DescriptionFilter.GetHashCode();
int i, n = criteriaSet.Count;
for (i = 0; i < n; i++)
{
ISearchCriteria criteria = criteriaSet[i];
//combine the current hash with the pervious hash
hashSum = hashSum ^ criteria.GetHashCode();
//check if a subset is cached for this hash
ICacheable entry = SearchSubsetsCache.Instance.GetEntry(hashSum);
if (entry != null)
{
criteriaSet.StartCriteriaIndex = i;
finalEntry = entry;
}
else
{
break;
}
}
SearchSubset subset = null;
if (finalEntry != null)
{
subset = finalEntry.GetClone() as SearchSubset;
}
return(subset);
}