/// <summary>
/// Helper method to create an ISearchCriteria for searching all fields in a <see cref="BaseLuceneSearcher"/>
/// </summary>
/// <param name="searchText"></param>
/// <param name="useWildcards"></param>
/// <param name="searcher"></param>
/// <returns></returns>
/// <remarks>
/// This is here because some of this stuff is internal in Examine
/// </remarks>
private ISearchCriteria SearchAllFields(string searchText, bool useWildcards, BaseLuceneSearcher searcher)
{
var sc = searcher.CreateSearchCriteria();
if (_examineGetSearchFields == null)
{
//get the GetSearchFields method from BaseLuceneSearcher
_examineGetSearchFields = typeof(BaseLuceneSearcher).GetMethod("GetSearchFields", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
}
//get the results of searcher.BaseLuceneSearcher() using ugly reflection since it's not public
var searchFields = (IEnumerable <string>)_examineGetSearchFields.Invoke(searcher, null);
//this is what Examine does internally to create ISearchCriteria for searching all fields
var strArray = searchText.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
sc = useWildcards == false
? sc.GroupedOr(searchFields, strArray).Compile()
: sc.GroupedOr(searchFields, strArray.Select(x => new CustomExamineValue(Examineness.ComplexWildcard, x.MultipleCharacterWildcard().Value)).ToArray <IExamineValue>()).Compile();
return(sc);
}
public IEnumerable <SearchResult> GetRawResults(string searchTerm, bool isFuzzy)
{
searchTerm = searchTerm.Trim(); //sanitise input
var searchCriteria = _searcher.CreateSearchCriteria(BooleanOperation.Or);
bool isPhrase = searchTerm.Contains(' ');
string luceneRawQuery;
if (isFuzzy && !isPhrase)//fuzzy single word
{
luceneRawQuery = searchTerm + '~';
}
else if (isFuzzy)//fuzzy multiple words
{
//More info about grouping https://lucene.apache.org/core/2_9_4/queryparsersyntax.html
var searchedTerms = searchTerm.Split(' ', ',', '.');
var luceneString = new StringBuilder();
for (var i = 0; i < searchedTerms.Length; i++)
{
var word = searchedTerms[i];
luceneString.Append(word + "~");
if (i != searchedTerms.Length - 1)
{
luceneString.Append(" AND ");
}
}
luceneRawQuery = luceneString.ToString();
}
else //not fuzzy, exact word or phrase
{
luceneRawQuery = "\"" + searchTerm + "\"" + "~1"; //one word proximity/distance
}
var query = searchCriteria.RawQuery(luceneRawQuery);
var results = _searcher.Search(query).OrderByDescending(x => x.Score);
return(isFuzzy ? results.TakeWhile(x => x.Score > 0.05f) : results);
}
/// <summary>
/// Generates the search criteria that we want to search on
/// </summary>
/// <param name="searcher"></param>
/// <returns></returns>
private ISearchCriteria GetSearchCriteria(BaseLuceneSearcher searcher)
{
var criteria = (LuceneSearchCriteria)searcher.CreateSearchCriteria();
//check if there's anything to process
if (NodeTypeAlias.IsNullOrWhiteSpace() && Term.IsNullOrWhiteSpace() && !Filters.Any())
{
return(null);
}
var sb = new StringBuilder();
if (string.IsNullOrEmpty(NodeTypeAlias) == false)
{
sb.AppendFormat("+nodeTypeAlias: {0} ", NodeTypeAlias);
}
// Three possiblities:
// * docs version (MajorDocsVersion) supplied, give current version and NEGATE OTHERS
// * no docs version (MajorDocsVersion) is not suplied, use it and NEGATE others
// * all versions are requests, this is currently not implemented
var currentMajorVersions = new string[] { "6", "7", "8", "9" };
// add mandatory majorVersion is parameter is supplied
string versionToFilterBy = MajorDocsVersion == null
? ConfigurationManager.AppSettings[Constants.AppSettings.DocumentationCurrentMajorVersion]
: MajorDocsVersion.ToString();
//we filter by this version by excluding the other major versions in lucene so
if (NodeTypeAlias.InvariantEquals("documentation") == false)
{
var versionsToNegate = currentMajorVersions.Where(f => f != versionToFilterBy).ToArray <string>();
foreach (var versionToNegate in versionsToNegate)
{
sb.AppendFormat("-majorVersion:{0} ", versionToNegate);
}
}
// do it the other way around for documentation
if (NodeTypeAlias.InvariantEquals("documentation"))
{
//we filter by this version by using the major versions
var versionsToFind = currentMajorVersions.Where(f => f == versionToFilterBy).ToArray <string>();
foreach (var versionToFind in versionsToFind)
{
sb.AppendFormat("+majorVersion:{0} ", versionToFind);
}
}
if (!string.IsNullOrEmpty(Term))
{
sb.Append("+(");
// Cleanup the term so there are no errors
Term = Term
.Replace("\"", string.Empty)
.Replace(":", string.Empty)
.Replace("\\", string.Empty)
.Trim('*');
// Replace OR's with case insensitive matching
Term = Regex.Replace(Term, @" OR ", " ", RegexOptions.IgnoreCase);
// Replace double whitespaces with single space as they were giving errors
Term = Regex.Replace(Term, @"\s{2,}", " ");
// Do an exact phrase match with boost
sb.AppendFormat("nodeName:\"{0}\"^20000 body:\"{0}\"^5000 ", Term);
// SEARCH YAML stuff
sb.AppendFormat("tags:\"{0}\"^20000 ", Term);
sb.AppendFormat("keywords:\"{0}\"^20000 ", Term);
// Now we need to split the phrase into individual terms so the query parser can understand
var split = Term.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
//now de-duplicate the terms and remove the stop words and don't include single chars
var deduped = new List <string>();
foreach (var s in split)
{
if (s.Length > 1 &&
!deduped.Contains(s, StringComparer.InvariantCultureIgnoreCase) &&
!StandardAnalyzer.STOP_WORDS_SET.Contains(s))
{
deduped.Add(s);
}
}
if (deduped.Count > 20)
{
//truncate, we don't want to search on all of these individually
deduped = deduped.Take(20).ToList();
}
if (deduped.Count > 0)
{
//do standard match with boost on each term
foreach (var s in deduped)
{
sb.AppendFormat("nodeName:{0}^10000 body:{0}^50 ", s);
}
//do suffix with wildcards
foreach (var s in deduped)
{
sb.AppendFormat("nodeName:{0}*^1000 body:{0}* ", s);
}
//do fuzzy (close match 0.9)
foreach (var s in deduped)
{
sb.AppendFormat("nodeName:{0}~0.9^0.1 body:{0}~0.9^0.1 ", s);
}
}
sb.Append(")");
}
//nothing to process, return
if (sb.Length > 0)
{
//render out the raw query that was constructed above
criteria = (LuceneSearchCriteria)criteria.RawQuery(sb.ToString());
}
//Now we can apply any filters, this is done by using native Lucene query objects
if (Filters.Any())
{
//If there is a filter applied to the entire result then add it here, this is a MUST sub query
foreach (var filter in Filters)
{
filter.ProcessLuceneAddFilters(searcher, criteria);
}
//need to process the excludes after - since that is how lucene works, you can only exclude after you've included
foreach (var filter in Filters)
{
filter.ProcessLuceneExcludeFilters(searcher, criteria);
}
}
if (string.IsNullOrEmpty(OrderBy) == false)
{
criteria.OrderByDescending(OrderBy);
}
return(criteria);
}
/// <summary>
/// Generates the search criteria that we want to search on
/// </summary>
/// <param name="searcher"></param>
/// <returns></returns>
public ISearchCriteria GetSearchCriteria(BaseLuceneSearcher searcher)
{
var criteria = (LuceneSearchCriteria)searcher.CreateSearchCriteria();
//check if there's anything to process
if (NodeTypeAlias.IsNullOrWhiteSpace() && Term.IsNullOrWhiteSpace() && !Filters.Any())
{
return(null);
}
if (string.IsNullOrEmpty(NodeTypeAlias) == false)
{
criteria.Field("nodeTypeAlias", NodeTypeAlias);
}
var sb = new StringBuilder();
if (!string.IsNullOrEmpty(Term))
{
//Cleanup the term so there are no errors
Term = Term.Replace("\"", string.Empty)
.Replace(":", string.Empty)
.Replace("\\", string.Empty).Trim('*');
//replace OR's with case insensitive matching
Term = Regex.Replace(Term, @" OR ", " ", RegexOptions.IgnoreCase);
// Replace double whitespaces with single space as they were giving errors
Term = Regex.Replace(Term, @"\s{2,}", " ");
//now we need to split the phrase into individual terms so the query parser can understand
var split = Term.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
if (split.Length > 1)
{
//do an exact phrase match with boost
sb.AppendFormat("nodeName:\"{0}\"^20000 body:\"{0}\"^5000 ", Term);
}
if (split.Length > 0)
{
//do standard match with boost on each term
foreach (var s in split)
{
sb.AppendFormat("nodeName:{0}^10000 body:{0}^50 ", s);
}
//do suffix with wildcards
foreach (var s in split)
{
sb.AppendFormat("nodeName:{0}*^1000 body:{0}* ", s);
}
//do fuzzy (close match 0.9)
foreach (var s in split)
{
sb.AppendFormat("nodeName:{0}~0.9^0.1 body:{0}~0.9^0.1 ", s);
}
}
}
//nothing to process, return
if (sb.Length > 0)
{
//render out the raw query that was constructed above
criteria = (LuceneSearchCriteria)criteria.RawQuery(sb.ToString());
}
//Now we can apply any filters, this is done by using native Lucene query objects
if (Filters.Any())
{
//If there is a filter applied to the entire result then add it here, this is a MUST sub query
foreach (var filter in Filters)
{
filter.ProcessLuceneAddFilters(searcher, criteria);
}
//need to process the excludes after - since that is how lucene works, you can only exclude after you've included
foreach (var filter in Filters)
{
filter.ProcessLuceneExcludeFilters(searcher, criteria);
}
}
if (string.IsNullOrEmpty(OrderBy) == false)
{
criteria.OrderByDescending(OrderBy);
}
return(criteria);
}