| using Lucene.Net.Index; |
| using Lucene.Net.Search.Spans; |
| using System; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.QueryParsers.Surround.Query |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /// <summary> |
| /// Factory for NEAR queries |
| /// </summary> |
| public class DistanceQuery : ComposedQuery, IDistanceSubQuery |
| { |
| public DistanceQuery( |
| IList<SrndQuery> queries, |
| bool infix, |
| int opDistance, |
| string opName, |
| bool ordered) |
| : base(queries, infix, opName) |
| { |
| this.opDistance = opDistance; /* the distance indicated in the operator */ |
| this.ordered = ordered; |
| } |
| |
| private readonly int opDistance; // LUCENENET: marked readonly |
| public virtual int OpDistance => opDistance; |
| |
| private readonly bool ordered; // LUCENENET: marked readonly |
| public virtual bool QueriesOrdered => ordered; |
| |
| |
| public virtual string DistanceSubQueryNotAllowed() |
| { |
| var sqi = GetSubQueriesEnumerator(); |
| while (sqi.MoveNext()) |
| { |
| var leq = sqi.Current; |
| if (leq is IDistanceSubQuery) |
| { |
| var dsq = sqi.Current as IDistanceSubQuery; |
| string m = dsq.DistanceSubQueryNotAllowed(); |
| if (m != null) |
| { |
| return m; |
| } |
| } |
| else |
| { |
| return "Operator " + OperatorName + " does not allow subquery " + leq.ToString(); |
| } |
| } |
| return null; /* subqueries acceptable */ |
| } |
| |
| public virtual void AddSpanQueries(SpanNearClauseFactory sncf) |
| { |
| Search.Query snq = GetSpanNearQuery(sncf.IndexReader, |
| sncf.FieldName, |
| Weight, |
| sncf.BasicQueryFactory); |
| sncf.AddSpanQuery(snq); |
| } |
| |
| public virtual Search.Query GetSpanNearQuery( |
| IndexReader reader, |
| string fieldName, |
| float boost, |
| BasicQueryFactory qf) |
| { |
| SpanQuery[] spanClauses = new SpanQuery[NrSubQueries]; |
| var sqi = GetSubQueriesEnumerator(); |
| int qi = 0; |
| while (sqi.MoveNext()) |
| { |
| SpanNearClauseFactory sncf = new SpanNearClauseFactory(reader, fieldName, qf); |
| |
| ((IDistanceSubQuery)sqi.Current).AddSpanQueries(sncf); |
| if (sncf.Count == 0) |
| { /* distance operator requires all sub queries */ |
| while (sqi.MoveNext()) |
| { /* produce evt. error messages but ignore results */ |
| ((IDistanceSubQuery)sqi.Current).AddSpanQueries(sncf); |
| sncf.Clear(); |
| } |
| return SrndQuery.TheEmptyLcnQuery; |
| } |
| |
| spanClauses[qi] = sncf.MakeSpanClause(); |
| qi++; |
| } |
| SpanNearQuery r = new SpanNearQuery(spanClauses, OpDistance - 1, QueriesOrdered); |
| r.Boost = boost; |
| return r; |
| } |
| |
| public override Search.Query MakeLuceneQueryFieldNoBoost(string fieldName, BasicQueryFactory qf) |
| { |
| return new DistanceRewriteQuery(this, fieldName, qf); |
| } |
| } |
| } |