/// <summary>
/// Searches an index for the specified string.
/// </summary>
/// <param name="indexId">The index id.</param>
/// <param name="wsId">The ws id.</param>
/// <param name="text">The text.</param>
/// <returns>The search results.</returns>
public IEnumerable <T> Search(int indexId, int wsId, string text)
{
if (string.IsNullOrEmpty(text))
{
return(Enumerable.Empty <T>());
}
SortKeyIndex index = GetIndex(indexId, wsId);
switch (m_type)
{
case SearchType.Exact:
case SearchType.Prefix:
{
byte[] sortKey = m_sortKeySelector(wsId, text);
var lower = new byte[text.Length * SortKeyFactor];
Collator.GetSortKeyBound(sortKey, UColBoundMode.UCOL_BOUND_LOWER, ref lower);
var upper = new byte[text.Length * SortKeyFactor];
Collator.GetSortKeyBound(sortKey,
m_type == SearchType.Exact
? UColBoundMode.UCOL_BOUND_UPPER
: UColBoundMode.UCOL_BOUND_UPPER_LONG, ref upper);
return(index.GetItems(lower, upper));
}
case SearchType.FullText:
IEnumerable <T> results = null;
string[] tokens = RemoveWhitespaceAndPunctTokens(m_tokenizer(wsId, text)).ToArray();
for (int i = 0; i < tokens.Length; i++)
{
byte[] sortKey = m_sortKeySelector(wsId, tokens[i]);
var lower = new byte[tokens[i].Length * SortKeyFactor];
Collator.GetSortKeyBound(sortKey, UColBoundMode.UCOL_BOUND_LOWER, ref lower);
var upper = new byte[tokens[i].Length * SortKeyFactor];
Collator.GetSortKeyBound(sortKey,
i < tokens.Length - 1
? UColBoundMode.UCOL_BOUND_UPPER
: UColBoundMode.UCOL_BOUND_UPPER_LONG, ref upper);
IEnumerable <T> items = index.GetItems(lower, upper);
results = results == null ? items : results.Intersect(items);
}
return(results);
}
return(Enumerable.Empty <T>());
}