protected void AddNumericRangeQuery(BooleanQuery query, NumericRangeField range, BooleanClause.Occur occurance)
{
var startTerm = new Term(range.FieldName, NumberTools.LongToString(range.Start));
var endTerm = new Term(range.FieldName, NumberTools.LongToString(range.End));
var rangeQuery = new RangeQuery(startTerm, endTerm, true);
query.Add(rangeQuery, occurance);
}
protected void AddNumericRangeQuery(BooleanQuery query, NumericRangeField range, BooleanClause.Occur occurance)
{
var startTerm = new Term(range.FieldName, SearchHelper.FormatNumber(range.Start));
var endTerm = new Term(range.FieldName, SearchHelper.FormatNumber(range.End));
var rangeQuery = new RangeQuery(startTerm, endTerm, true);
query.Add(rangeQuery, occurance);
}
internal static void AddDateRangeQuery(BooleanQuery query, DateRangeSearchParam.DateRangeField dateRangeField, BooleanClause.Occur occurance)
{
var startDateTime = dateRangeField.StartDate;
if (dateRangeField.InclusiveStart)
{
if (startDateTime != DateTime.MinValue)
{
startDateTime.ChangeTime(0, 0, 0, 0);
}
}
var endDateTime = dateRangeField.EndDate;
if (dateRangeField.InclusiveStart)
{
if (endDateTime != DateTime.MaxValue)
{
endDateTime = endDateTime.ChangeTime(23, 59, 59, 59);
}
}
BooleanQuery.SetMaxClauseCount(int.MaxValue);
if (!(dateRangeField.StartDate == DateTime.MinValue && dateRangeField.EndDate == DateTime.MaxValue))
{
query.Add(new RangeQuery(new Term(SearchFieldIDs.CreatedDate, startDateTime.ToString("yyyyMMdd")), new Term(SearchFieldIDs.CreatedDate, endDateTime.ToString("yyyyMMdd")), true), occurance);
}
}
public static Query MergeQueries(Query queryA, Query queryB, BooleanClause.Occur queryAOccurence, BooleanClause.Occur queryBOccurence)
{
BooleanQuery compoundQuery = new BooleanQuery();
compoundQuery.Add(new BooleanClause(queryA, queryAOccurence));
compoundQuery.Add(new BooleanClause(queryB, queryBOccurence));
return compoundQuery;
}
public static Query Raw(this BooleanQuery booleanQuery, string field, string queryText, BooleanClause.Occur occur = null)
{
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_29);
QueryParser queryParser = new QueryParser(Version.LUCENE_29, field, analyzer);
Query query = queryParser.Parse(queryText);
booleanQuery.Add(query, occur);
return query;
}
public static PhraseQuery Phrase(this BooleanQuery inputQuery, BooleanClause.Occur occur = null)
{
BooleanQuery parentQuery = GetParentQuery(inputQuery);
PhraseQuery query = new PhraseQuery();
SetOccurValue(inputQuery, ref occur);
parentQuery.Add(query, occur);
return query;
}
public static Query MergeQueries(BooleanClause.Occur queryOccurence, params Query[] queries)
{
BooleanQuery compoundQuery = new BooleanQuery();
foreach (Query query in queries)
{
compoundQuery.Add(new BooleanClause(query, queryOccurence));
}
return compoundQuery;
}
public static TermQuery Term(this BooleanQuery inputQuery, string fieldName, string fieldValue, BooleanClause.Occur occur = null)
{
Term term = new Term(fieldName, fieldValue);
BooleanQuery parentQuery = GetParentQuery(inputQuery);
TermQuery query = new TermQuery(term);
SetOccurValue(inputQuery, ref occur);
parentQuery.Add(query, occur);
return query;
}
public static BooleanQuery Group(this BooleanQuery inputQuery, BooleanClause.Occur occur = null, params Action<GroupedBooleanQuery>[] queries)
{
var groupedBooleanQuery = inputQuery.AddGroup(BooleanClause.Occur.SHOULD, queries);
if (groupedBooleanQuery == null)
{
throw new Exception("An error occurred creating the inner query");
}
return inputQuery.AddGroup(BooleanClause.Occur.SHOULD, queries);
}
public static void AddQueriesToBoolean(
BooleanQuery bq,
IEnumerable<Search.Query> queries,
BooleanClause.Occur occur)
{
foreach (var query in queries)
{
bq.Add(query, occur);
}
}
private static void AssertResult(LuceneQueryPredicateExpression result, BooleanClause.Occur expectedOccur)
{
Assert.That(result, Is.Not.Null, "Expected LuceneQueryPredicateExpression to be returned.");
Assert.That(result, Is.Not.SameAs(predicate));
Assert.That(result.QueryField, Is.SameAs(predicate.QueryField));
Assert.That(result.QueryPattern, Is.SameAs(predicate.QueryPattern));
Assert.That(result.QueryType, Is.EqualTo(predicate.QueryType));
Assert.That(result.Occur, Is.EqualTo(expectedOccur));
Assert.That(result.Boost, Is.EqualTo(predicate.Boost));
Assert.That(result.AllowSpecialCharacters, Is.EqualTo(predicate.AllowSpecialCharacters));
}
public static Search.Query MakeBooleanQuery(
IEnumerable<Search.Query> queries,
BooleanClause.Occur occur)
{
if (queries.Count() <= 1)
{
throw new InvalidOperationException("Too few subqueries: " + queries.Count());
}
BooleanQuery bq = new BooleanQuery();
AddQueriesToBoolean(bq, queries, occur);
return bq;
}
protected BooleanQuery ApplyNumericRangeSearchParam(BooleanClause.Occur innerOccurance)
{
var innerQuery = new BooleanQuery();
if (Ranges.Count <= 0) return null;
foreach (var range in Ranges)
{
AddNumericRangeQuery(innerQuery, range, innerOccurance);
}
return innerQuery;
}
protected BooleanQuery ApplyDateRangeSearchParam(BooleanClause.Occur innerCondition)
{
var innerQuery = new BooleanQuery();
if (Ranges.Count <= 0) return null;
foreach (var dateParam in Ranges)
{
AddDateRangeQuery(innerQuery, dateParam, innerCondition);
}
return innerQuery;
}
public virtual List<SkinnyItem> GetItems(IEnumerable<SearchParam> parameters, bool showAllVersions, string sortField, bool reverse, int start, int end, out int totalResults)
{
Assert.IsNotNull(Index, "Index");
var translator = new QueryTranslator(Index);
var query = new BooleanQuery();
foreach (var parameter in parameters.Where(p => p != null))
{
var innerQueryResult = parameter.ProcessQuery(parameter.Condition, Index);
if (innerQueryResult.GetClauses().Length > 0)
{
var clause = new BooleanClause(innerQueryResult, translator.GetOccur(parameter.Condition));
query.Add(clause);
}
}
return RunQuery(query, showAllVersions, sortField, reverse, start, end, out totalResults);
}
public ISearchBuilder Parse(string[] defaultFields, string query, bool escape, bool mandatory) {
if ( defaultFields.Length == 0 ) {
throw new ArgumentException("Default field can't be empty");
}
if ( String.IsNullOrWhiteSpace(query) ) {
throw new ArgumentException("Query can't be empty");
}
if (escape) {
query = QueryParser.Escape(query);
}
var analyzer = LuceneIndexProvider.CreateAnalyzer();
foreach ( var defaultField in defaultFields ) {
var clause = new BooleanClause(new QueryParser(LuceneIndexProvider.LuceneVersion, defaultField, analyzer).Parse(query), mandatory ? BooleanClause.Occur.MUST : BooleanClause.Occur.SHOULD);
_clauses.Add(clause);
}
_query = null;
return this;
}
protected void AddDateRangeQuery(BooleanQuery query, DateRange dateRangeField, BooleanClause.Occur occurance)
{
var startDateTime = dateRangeField.StartDate;
var endDateTime = dateRangeField.EndDate;
if (dateRangeField.InclusiveStart && startDateTime > DateTime.MinValue.AddDays(1))
{
startDateTime = startDateTime.AddDays(-1);
}
if (dateRangeField.InclusiveEnd && endDateTime < DateTime.MaxValue.AddDays(-1))
{
endDateTime = endDateTime.AddDays(1);
}
// converting to lucene format
var startDate = DateTools.DateToString(startDateTime, DateTools.Resolution.DAY);
var endDate = DateTools.DateToString(endDateTime, DateTools.Resolution.DAY);
var rangeQuery = new RangeQuery(new Term(dateRangeField.FieldName, startDate), new Term(dateRangeField.FieldName, endDate), true);
query.Add(rangeQuery, occurance);
}
public static Query BuildDateRangeSearchParam(IEnumerable<DateRangeSearchParam.DateRange> ranges, BooleanClause.Occur condition)
{
Assert.ArgumentNotNull(ranges, "Ranges");
if (!ranges.Any())
{
return null;
}
if (ranges.Count() == 1)
{
return BuildDateRangeQuery(ranges.First());
}
var innerQuery = new BooleanQuery();
foreach (var range in ranges)
{
innerQuery.Add(BuildDateRangeQuery(range), condition);
}
return innerQuery;
}
public virtual BooleanClause[] VisitBooleanClauses(BooleanClause[] clauses)
{
List<BooleanClause> newList = null;
int index = 0;
int count = clauses.Length;
while (index < count)
{
var visitedClause = VisitBooleanClause(clauses[index]);
if (newList != null)
{
newList.Add(visitedClause);
}
else if (visitedClause != clauses[index])
{
newList = new List<BooleanClause>();
for (int i = 0; i < index; i++)
newList.Add(clauses[i]);
newList.Add(visitedClause);
}
index++;
}
return newList != null ? newList.ToArray() : clauses;
}
public override void Add(BooleanClause clause)
{
throw new NotSupportedException();
}
protected void ApplyLanguageClause(BooleanQuery query, string language, BooleanClause.Occur occurance)
{
if (String.IsNullOrEmpty(language)) return;
var phraseQuery = new PhraseQuery();
phraseQuery.Add(new Term(BuiltinFields.Language, language.ToLowerInvariant()));
query.Add(phraseQuery, occurance);
}
private Query CompileExpressionListNode(ExpressionList expression)
{
int expCount = expression.Expressions.Count;
if (expCount == 0)
throw new NotSupportedException("Do not use empty ExpressionList");
if (expression.Expressions.Count == 1)
return CompileExpressionNode(expression.Expressions[0]);
var result = new BooleanQuery();
var occur = (expression.OperatorType == ChainOperator.And) ? BooleanClause.Occur.MUST : BooleanClause.Occur.SHOULD;
foreach (Expression expr in expression.Expressions)
{
//var q = CompileExpressionNode(expr);
//var clause = new BooleanClause(q, occur);
//result.Add(clause);
Query q;
BooleanClause clause;
var notExp = expr as NotExpression;
if (notExp != null)
{
q = CompileExpressionNode(notExp.Expression);
clause = new BooleanClause(q, BooleanClause.Occur.MUST_NOT);
}
else
{
var binwrapper = expr as IBinaryExpressionWrapper;
if (binwrapper != null && binwrapper.BinExp.Operator == Operator.NotEqual)
{
q = CompileBinaryExpression(binwrapper.BinExp.LeftValue, Operator.Equal, binwrapper.BinExp.RightValue);
clause = new BooleanClause(q, BooleanClause.Occur.MUST_NOT);
}
else
{
q = CompileExpressionNode(expr);
clause = new BooleanClause(q, occur);
}
}
result.Add(clause);
}
return result;
}
private Query CompileNotExpressionNode(NotExpression expression)
{
//var notInTreeQ = CompileCheckNotInTreeQuery(expression);
//if (notInTreeQ != null)
// return notInTreeQ;
var q = CompileExpressionNode(expression.Expression);
var result = new BooleanQuery();
var clause = new BooleanClause(q, BooleanClause.Occur.MUST_NOT);
result.Add(clause);
return result;
}
private void AddBooleanClause(BooleanQuery boolQuery, Query query, BooleanClause.Occur occur)
{
var boolQ = query as BooleanQuery;
if (boolQ == null)
{
boolQuery.Add(new BooleanClause(query, occur));
return;
}
var clauses = boolQ.GetClauses();
if (clauses.Length == 0)
{
throw ParserError("Empty BooleanQuery");
}
if (clauses.Length > 1)
{
boolQuery.Add(new BooleanClause(query, occur));
return;
}
//-- boolQ has one clause: combine occurs
var clause = (BooleanClause)clauses[0];
var clauseOccur = clause.GetOccur();
BooleanClause.Occur effectiveOccur;
if (Operator == DefaultOperator.Or)
{
// in cl eff
// null _ ==> _
// null + ==> +
// null - ==> -
// _ _ ==> _
// _ + ==> +
// _ - ==> -
// + _ ==> +
// + + ==> +
// + - ==> -
// - _ ==> -
// - + ==> -
// - - ==> -
if (occur == null || occur == BooleanClause.Occur.SHOULD)
effectiveOccur = clauseOccur;
else if (occur == BooleanClause.Occur.MUST_NOT)
effectiveOccur = occur;
else if (clauseOccur == BooleanClause.Occur.MUST_NOT)
effectiveOccur = clauseOccur;
else
effectiveOccur = occur;
}
else
{
// in cl eff
// null _ ==> _
// null + ==> +
// null - ==> -
// _ _ ==> _
// _ + ==> _
// _ - ==> -
// + _ ==> +
// + + ==> +
// + - ==> -
// - _ ==> -
// - + ==> -
// - - ==> -
if (occur == null)
effectiveOccur = clauseOccur;
else if (occur == BooleanClause.Occur.MUST_NOT)
effectiveOccur = occur;
else if (clauseOccur == BooleanClause.Occur.MUST_NOT)
effectiveOccur = clauseOccur;
else
effectiveOccur = occur;
}
clause.SetOccur(effectiveOccur);
boolQuery.Add(clause);
}
public virtual Explanation Explain(IndexReader reader, int doc)
{
Explanation sumExpl = new Explanation();
sumExpl.SetDescription("sum of:");
int coord = 0;
int maxCoord = 0;
float sum = 0.0f;
for (int i = 0; i < weights.Count; i++)
{
BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i];
Weight w = (Weight)weights[i];
Explanation e = w.Explain(reader, doc);
if (!c.IsProhibited())
{
maxCoord++;
}
if (e.GetValue() > 0)
{
if (!c.IsProhibited())
{
sumExpl.AddDetail(e);
sum += e.GetValue();
coord++;
}
else
{
return(new Explanation(0.0f, "match prohibited"));
}
}
else if (c.IsRequired())
{
return(new Explanation(0.0f, "match required"));
}
}
sumExpl.SetValue(sum);
if (coord == 1)
{
// only one clause matched
sumExpl = sumExpl.GetDetails()[0]; // eliminate wrapper
}
float coordFactor = similarity.Coord(coord, maxCoord);
if (coordFactor == 1.0f)
{
// coord is no-op
return(sumExpl);
}
// eliminate wrapper
else
{
Explanation result = new Explanation();
result.SetDescription("product of:");
result.AddDetail(sumExpl);
result.AddDetail(new Explanation(coordFactor, "coord(" + coord + "/" + maxCoord + ")"));
result.SetValue(sum * coordFactor);
return(result);
}
}
protected virtual void SetOccurValue(IQueryBuilder inputQueryBuilder, ref BooleanClause.Occur occur)
{
if (occur != null)
{
return;
}
occur = inputQueryBuilder != null ? inputQueryBuilder.DefaultChildrenOccur : BooleanClause.Occur.MUST;
}
public override Explanation Explain(AtomicReaderContext context, int doc)
{
int minShouldMatch = outerInstance.MinimumNumberShouldMatch;
ComplexExplanation sumExpl = new ComplexExplanation();
sumExpl.Description = "sum of:";
int coord = 0;
float sum = 0.0f;
bool fail = false;
int shouldMatchCount = 0;
using (IEnumerator <BooleanClause> cIter = outerInstance.clauses.GetEnumerator())
{
foreach (Weight w in m_weights)
{
cIter.MoveNext();
BooleanClause c = cIter.Current;
if (w.GetScorer(context, context.AtomicReader.LiveDocs) == null)
{
if (c.IsRequired)
{
fail = true;
Explanation r = new Explanation(0.0f, "no match on required clause (" + c.Query.ToString() + ")");
sumExpl.AddDetail(r);
}
continue;
}
Explanation e = w.Explain(context, doc);
if (e.IsMatch)
{
if (!c.IsProhibited)
{
sumExpl.AddDetail(e);
sum += e.Value;
coord++;
}
else
{
Explanation r = new Explanation(0.0f, "match on prohibited clause (" + c.Query.ToString() + ")");
r.AddDetail(e);
sumExpl.AddDetail(r);
fail = true;
}
if (c.Occur == Occur_e.SHOULD)
{
shouldMatchCount++;
}
}
else if (c.IsRequired)
{
Explanation r = new Explanation(0.0f, "no match on required clause (" + c.Query.ToString() + ")");
r.AddDetail(e);
sumExpl.AddDetail(r);
fail = true;
}
}
}
if (fail)
{
sumExpl.Match = false;
sumExpl.Value = 0.0f;
sumExpl.Description = "Failure to meet condition(s) of required/prohibited clause(s)";
return(sumExpl);
}
else if (shouldMatchCount < minShouldMatch)
{
sumExpl.Match = false;
sumExpl.Value = 0.0f;
sumExpl.Description = "Failure to match minimum number " + "of optional clauses: " + minShouldMatch;
return(sumExpl);
}
sumExpl.Match = 0 < coord ? true : false;
sumExpl.Value = sum;
float coordFactor = disableCoord ? 1.0f : Coord(coord, m_maxCoord);
if (coordFactor == 1.0f)
{
return(sumExpl); // eliminate wrapper
}
else
{
ComplexExplanation result = new ComplexExplanation(sumExpl.IsMatch, sum * coordFactor, "product of:");
result.AddDetail(sumExpl);
result.AddDetail(new Explanation(coordFactor, "coord(" + coord + "/" + m_maxCoord + ")"));
return(result);
}
}
public override Scorer GetScorer(AtomicReaderContext context, IBits acceptDocs)
{
IList <Scorer> required = new List <Scorer>();
IList <Scorer> prohibited = new List <Scorer>();
IList <Scorer> optional = new List <Scorer>();
IEnumerator <BooleanClause> cIter = outerInstance.clauses.GetEnumerator();
foreach (Weight w in m_weights)
{
cIter.MoveNext();
BooleanClause c = cIter.Current;
Scorer subScorer = w.GetScorer(context, acceptDocs);
if (subScorer == null)
{
if (c.IsRequired)
{
return(null);
}
}
else if (c.IsRequired)
{
required.Add(subScorer);
}
else if (c.IsProhibited)
{
prohibited.Add(subScorer);
}
else
{
optional.Add(subScorer);
}
}
if (required.Count == 0 && optional.Count == 0)
{
// no required and optional clauses.
return(null);
}
else if (optional.Count < outerInstance.m_minNrShouldMatch)
{
// either >1 req scorer, or there are 0 req scorers and at least 1
// optional scorer. Therefore if there are not enough optional scorers
// no documents will be matched by the query
return(null);
}
// simple conjunction
if (optional.Count == 0 && prohibited.Count == 0)
{
float coord = disableCoord ? 1.0f : Coord(required.Count, m_maxCoord);
return(new ConjunctionScorer(this, required.ToArray(), coord));
}
// simple disjunction
if (required.Count == 0 && prohibited.Count == 0 && outerInstance.m_minNrShouldMatch <= 1 && optional.Count > 1)
{
var coord = new float[optional.Count + 1];
for (int i = 0; i < coord.Length; i++)
{
coord[i] = disableCoord ? 1.0f : Coord(i, m_maxCoord);
}
return(new DisjunctionSumScorer(this, optional.ToArray(), coord));
}
// Return a BooleanScorer2
return(new BooleanScorer2(this, disableCoord, outerInstance.m_minNrShouldMatch, required, prohibited, optional, m_maxCoord));
}
public override Explanation Explain(IndexReader reader, int doc)
{
int minShouldMatch = Enclosing_Instance.GetMinimumNumberShouldMatch();
ComplexExplanation sumExpl = new ComplexExplanation();
sumExpl.SetDescription("sum of:");
int coord = 0;
int maxCoord = 0;
float sum = 0.0f;
bool fail = false;
int shouldMatchCount = 0;
IEnumerator <BooleanClause> cIter = Enclosing_Instance.clauses.GetEnumerator();
foreach (Weight w in weights)
{
cIter.MoveNext();
BooleanClause c = cIter.Current;
if (w.Scorer(reader, true, true) == null)
{
continue;
}
Explanation e = w.Explain(reader, doc);
if (!c.IsProhibited())
{
maxCoord++;
}
if (e.IsMatch())
{
if (!c.IsProhibited())
{
sumExpl.AddDetail(e);
sum += e.GetValue();
coord++;
}
else
{
Explanation r = new Explanation(0.0f, "match on prohibited clause (" + c.GetQuery().ToString() + ")");
r.AddDetail(e);
sumExpl.AddDetail(r);
fail = true;
}
if (c.GetOccur() == Occur.SHOULD)
{
shouldMatchCount++;
}
}
else if (c.IsRequired())
{
Explanation r = new Explanation(0.0f, "no match on required clause (" + c.GetQuery().ToString() + ")");
r.AddDetail(e);
sumExpl.AddDetail(r);
fail = true;
}
}
if (fail)
{
System.Boolean tempAux = false;
sumExpl.SetMatch(tempAux);
sumExpl.SetValue(0.0f);
sumExpl.SetDescription("Failure to meet condition(s) of required/prohibited clause(s)");
return(sumExpl);
}
else if (shouldMatchCount < minShouldMatch)
{
System.Boolean tempAux2 = false;
sumExpl.SetMatch(tempAux2);
sumExpl.SetValue(0.0f);
sumExpl.SetDescription("Failure to match minimum number " + "of optional clauses: " + minShouldMatch);
return(sumExpl);
}
sumExpl.SetMatch(0 < coord?true:false);
sumExpl.SetValue(sum);
float coordFactor = similarity.Coord(coord, maxCoord);
if (coordFactor == 1.0f)
{
// coord is no-op
return(sumExpl);
}
// eliminate wrapper
else
{
ComplexExplanation result = new ComplexExplanation(sumExpl.IsMatch(), sum * coordFactor, "product of:");
result.AddDetail(sumExpl);
result.AddDetail(new Explanation(coordFactor, "coord(" + coord + "/" + maxCoord + ")"));
return(result);
}
}
/// <summary>Prints a user-readable version of this query. </summary>
public override System.String ToString(System.String field)
{
System.Text.StringBuilder buffer = new System.Text.StringBuilder();
bool needParens = (GetBoost() != 1.0) || (GetMinimumNumberShouldMatch() > 0);
if (needParens)
{
buffer.Append("(");
}
for (int i = 0; i < clauses.Count; i++)
{
BooleanClause c = clauses[i];
if (c.IsProhibited())
{
buffer.Append("-");
}
else if (c.IsRequired())
{
buffer.Append("+");
}
Query subQuery = c.GetQuery();
if (subQuery != null)
{
if (subQuery is BooleanQuery)
{
// wrap sub-bools in parens
buffer.Append("(");
buffer.Append(subQuery.ToString(field));
buffer.Append(")");
}
else
{
buffer.Append(subQuery.ToString(field));
}
}
else
{
buffer.Append("null");
}
if (i != clauses.Count - 1)
{
buffer.Append(" ");
}
}
if (needParens)
{
buffer.Append(")");
}
if (GetMinimumNumberShouldMatch() > 0)
{
buffer.Append('~');
buffer.Append(GetMinimumNumberShouldMatch());
}
if (GetBoost() != 1.0f)
{
buffer.Append(ToStringUtils.Boost(GetBoost()));
}
return(buffer.ToString());
}
public override void Add(Search.Query query, BooleanClause.Occur occur)
{
throw new NotSupportedException();
}
public static Query BuildMultiFieldQuery(IEnumerable<MultiFieldSearchParam.Refinement> refinements, BooleanClause.Occur condition)
{
Assert.ArgumentNotNull(refinements, "Refinements");
if (!refinements.Any())
{
return null;
}
if (refinements.Count() == 1)
{
return BuildFieldQuery(refinements.First().Name, refinements.First().Value);
}
var innerQuery = new BooleanQuery();
foreach (var refinement in refinements)
{
innerQuery.Add(BuildFieldQuery(refinement.Name, refinement.Value), condition);
}
return innerQuery;
}
/// <summary>
/// Parses a query, searching on the fields specified. Use this if you need to
/// specify certain fields as required, and others as prohibited.
/// <para/>
/// Usage:
/// <code>
/// string[] fields = {"filename", "contents", "description"};
/// BooleanClause.Occur[] flags = {BooleanClause.Occur.SHOULD,
/// BooleanClause.Occur.MUST,
/// BooleanClause.Occur.MUST_NOT};
/// MultiFieldQueryParser.Parse("query", fields, flags, analyzer);
/// </code>
/// <para/>
/// The code above would construct a query:
/// <code>
/// (filename:query) +(contents:query) -(description:query)
/// </code>
/// </summary>
/// <param name="query">Query string to parse</param>
/// <param name="fields">Fields to search on</param>
/// <param name="flags">Flags describing the fields</param>
/// <param name="analyzer">Analyzer to use</param>
/// <exception cref="ArgumentException">
/// if the length of the fields array differs from the length of the
/// flags array
/// </exception>
public static Query Parse(string query, string[] fields,
BooleanClause.Occur[] flags, Analyzer analyzer)
{
if (fields.Length != flags.Length)
throw new ArgumentException("fields.length != flags.length");
BooleanQuery bQuery = new BooleanQuery();
StandardQueryParser qp = new StandardQueryParser();
qp.Analyzer = analyzer;
for (int i = 0; i < fields.Length; i++)
{
Query q = qp.Parse(query, fields[i]);
if (q != null && // q never null, just being defensive
(!(q is BooleanQuery) || ((BooleanQuery)q).GetClauses().Count > 0))
{
bQuery.Add(q, flags[i]);
}
}
return bQuery;
}
/// <summary>Adds a clause to a boolean query.
///
/// </summary>
/// <throws> TooManyClauses if the new number of clauses exceeds the maximum clause number </throws>
/// <seealso cref="#GetMaxClauseCount()">
/// </seealso>
public virtual void Add(Query query, BooleanClause.Occur occur)
{
Add(new BooleanClause(query, occur));
}
/// <summary>Adds a clause to a boolean query.</summary>
/// <throws> TooManyClauses if the new number of clauses exceeds the maximum clause number </throws>
/// <seealso cref="#GetMaxClauseCount()">
/// </seealso>
public virtual void Add(BooleanClause clause)
{
if (clauses.Count >= maxClauseCount)
throw new TooManyClauses();
clauses.Add(clause);
}
/// <returns> A good old 1.4 Scorer
/// </returns>
public virtual Scorer Scorer(IndexReader reader)
{
// First see if the (faster) ConjunctionScorer will work. This can be
// used when all clauses are required. Also, at this point a
// BooleanScorer cannot be embedded in a ConjunctionScorer, as the hits
// from a BooleanScorer are not always sorted by document number (sigh)
// and hence BooleanScorer cannot implement skipTo() correctly, which is
// required by ConjunctionScorer.
bool allRequired = true;
bool noneBoolean = true;
for (int i = 0; i < weights.Count; i++)
{
BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i];
if (!c.IsRequired())
{
allRequired = false;
}
if (c.GetQuery() is BooleanQuery)
{
noneBoolean = false;
}
}
if (allRequired && noneBoolean)
{
// ConjunctionScorer is okay
ConjunctionScorer result = new ConjunctionScorer(similarity);
for (int i = 0; i < weights.Count; i++)
{
Weight w = (Weight)weights[i];
Scorer subScorer = w.Scorer(reader);
if (subScorer == null)
{
return(null);
}
result.Add(subScorer);
}
return(result);
}
// Use good-old BooleanScorer instead.
BooleanScorer result2 = new BooleanScorer(similarity);
for (int i = 0; i < weights.Count; i++)
{
BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i];
Weight w = (Weight)weights[i];
Scorer subScorer = w.Scorer(reader);
if (subScorer != null)
{
result2.Add(subScorer, c.IsRequired(), c.IsProhibited());
}
else if (c.IsRequired())
{
return(null);
}
}
return(result2);
}