/// <inheritdoc/>
public void Visit(LuceneBoolQuery boolQueryWrapper)
{
VerifyValid(boolQueryWrapper);
var boolClause = new BoolQuery();
var must = new List <IQuery>();
var should = new List <IQuery>();
var mustNot = new List <IQuery>();
var clauses = ((BooleanQuery)boolQueryWrapper.LuceneQuery).GetClauses();
foreach (BooleanClause clause in clauses)
{
// based on the the current clause, instansiate the correct Lucene Query object
var luceneQuery =
VisitableLuceneQueryFactory.Make(clause.Query);
luceneQuery.Accept(this);
switch (clause.Occur)
{
case Occur.MUST:
must.Add(luceneQuery.ESQuery);
break;
case Occur.SHOULD:
should.Add(luceneQuery.ESQuery);
break;
case Occur.MUST_NOT:
mustNot.Add(luceneQuery.ESQuery);
break;
}
}
boolClause.Must = must;
boolClause.Should = should;
boolClause.MustNot = mustNot;
boolQueryWrapper.ESQuery = boolClause;
}
/// <summary>
/// Given a clause which has a Lucene based phrase, creates a KQL query.
/// </summary>
/// <param name="queryStringClause">The given clausse.</param>
/// <returns>A KQL query string.</returns>
private string CreateKqlFromLucenePhrase(QueryStringClause queryStringClause)
{
// we need to parse the phrase
using var analyzer = new WhitespaceAnalyzer();
var queryParser =
new QueryParser(
Lucene.Net.Util.Version.LUCENE_30,
queryStringClause.Default,
analyzer)
{
AllowLeadingWildcard = queryStringClause.Wildcard,
LowercaseExpandedTerms = false,
};
// escaping special charachters from the pharse before parsing.
// we would call QueryParser.Escape() method, but it escapes all charachters and
// in our case we only have to worry about backslash.
// implementation is based on: https://github.com/apache/lucenenet/blob/0eaf76540b8de326d1aa9ca24f4b5d6425a9ae38/src/Lucene.Net.QueryParser/Classic/QueryParserBase.cs
var escapedPhrase = queryStringClause.Phrase.Replace(@"\", @"\\\", StringComparison.OrdinalIgnoreCase);
// we parse and get the Lucene.Net query model
var query = queryParser.Parse(escapedPhrase);
// We make our own 'visitable' Lucence.Net query model
var luceneQuery = VisitableLuceneQueryFactory.Make(query);
// Visit
var luceneVisitor = new LuceneVisitor();
luceneQuery.Accept(luceneVisitor);
dynamic esQuery = luceneQuery.ESQuery;
esQuery.Accept(this);
return(esQuery.KustoQL);
}
