| using System; |
| using System.Collections.Generic; |
| using System.Text; |
| |
| 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> |
| /// Base class for composite queries (such as AND/OR/NOT) |
| /// </summary> |
| public abstract class ComposedQuery : SrndQuery |
| { |
| protected ComposedQuery(IList<SrndQuery> qs, bool operatorInfix, string opName) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected) |
| { |
| Recompose(qs); |
| this.operatorInfix = operatorInfix; |
| this.m_opName = opName; |
| } |
| |
| protected virtual void Recompose(IList<SrndQuery> queries) |
| { |
| if (queries.Count < 2) throw new InvalidOperationException("Too few subqueries"); |
| this.m_queries = new List<SrndQuery>(queries); |
| } |
| |
| protected string m_opName; |
| public virtual string OperatorName => m_opName; |
| |
| protected IList<SrndQuery> m_queries; |
| |
| public virtual IEnumerator<SrndQuery> GetSubQueriesEnumerator() |
| { |
| return m_queries.GetEnumerator(); |
| } |
| |
| public virtual int NrSubQueries => m_queries.Count; |
| |
| public virtual SrndQuery GetSubQuery(int qn) { return m_queries[qn]; } |
| |
| private readonly bool operatorInfix; |
| public virtual bool IsOperatorInfix => operatorInfix; /* else prefix operator */ |
| |
| public virtual IList<Search.Query> MakeLuceneSubQueriesField(string fn, BasicQueryFactory qf) |
| { |
| List<Search.Query> luceneSubQueries = new List<Search.Query>(); |
| using (IEnumerator<SrndQuery> sqi = GetSubQueriesEnumerator()) |
| { |
| while (sqi.MoveNext()) |
| { |
| luceneSubQueries.Add((sqi.Current).MakeLuceneQueryField(fn, qf)); |
| } |
| } |
| return luceneSubQueries; |
| } |
| |
| public override string ToString() |
| { |
| StringBuilder r = new StringBuilder(); |
| if (IsOperatorInfix) |
| { |
| InfixToString(r); |
| } |
| else |
| { |
| PrefixToString(r); |
| } |
| WeightToString(r); |
| return r.ToString(); |
| } |
| |
| // Override for different spacing |
| protected virtual string PrefixSeparator => ", "; |
| protected virtual string BracketOpen => "("; |
| protected virtual string BracketClose => ")"; |
| |
| protected virtual void InfixToString(StringBuilder r) |
| { |
| /* Brackets are possibly redundant in the result. */ |
| IEnumerator<SrndQuery> sqi = GetSubQueriesEnumerator(); |
| r.Append(BracketOpen); |
| if (sqi.MoveNext()) |
| { |
| r.Append(sqi.Current.ToString()); |
| while (sqi.MoveNext()) |
| { |
| r.Append(" "); |
| r.Append(OperatorName); /* infix operator */ |
| r.Append(" "); |
| r.Append(sqi.Current.ToString()); |
| } |
| } |
| r.Append(BracketClose); |
| } |
| |
| protected virtual void PrefixToString(StringBuilder r) |
| { |
| IEnumerator<SrndQuery> sqi = GetSubQueriesEnumerator(); |
| r.Append(OperatorName); /* prefix operator */ |
| r.Append(BracketOpen); |
| if (sqi.MoveNext()) |
| { |
| r.Append(sqi.Current.ToString()); |
| while (sqi.MoveNext()) |
| { |
| r.Append(PrefixSeparator); |
| r.Append(sqi.Current.ToString()); |
| } |
| } |
| r.Append(BracketClose); |
| } |
| |
| public override bool IsFieldsSubQueryAcceptable |
| { |
| get |
| { |
| /* at least one subquery should be acceptable */ |
| IEnumerator<SrndQuery> sqi = GetSubQueriesEnumerator(); |
| while (sqi.MoveNext()) |
| { |
| if ((sqi.Current).IsFieldsSubQueryAcceptable) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| } |
| } |