| using Lucene.Net.Search; |
| using Lucene.Net.Support; |
| using System; |
| 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> |
| /// Lowest level base class for surround queries |
| /// </summary> |
| public abstract class SrndQuery |
| #if FEATURE_CLONEABLE |
| : System.ICloneable |
| #endif |
| { |
| //public SrndQuery() { } |
| |
| private float weight = (float)1.0; |
| private bool weighted = false; |
| |
| public virtual bool IsWeighted => weighted; |
| |
| public virtual float Weight |
| { |
| get => weight; |
| set |
| { |
| weight = value; /* as parsed from the query text */ |
| weighted = true; |
| } |
| } |
| |
| public virtual string WeightString => Number.ToString(Weight); |
| |
| public virtual string WeightOperator => "^"; |
| |
| protected virtual void WeightToString(StringBuilder r) |
| { |
| /* append the weight part of a query */ |
| if (IsWeighted) |
| { |
| r.Append(WeightOperator); |
| r.Append(WeightString); |
| } |
| } |
| |
| public virtual Search.Query MakeLuceneQueryField(string fieldName, BasicQueryFactory qf) |
| { |
| Search.Query q = MakeLuceneQueryFieldNoBoost(fieldName, qf); |
| if (IsWeighted) |
| { |
| q.Boost=(Weight * q.Boost); /* weight may be at any level in a SrndQuery */ |
| } |
| return q; |
| } |
| |
| public abstract Search.Query MakeLuceneQueryFieldNoBoost(string fieldName, BasicQueryFactory qf); |
| |
| /// <summary> |
| /// This method is used by <see cref="GetHashCode()"/> and <see cref="Equals(Object)"/>, |
| /// see LUCENE-2945. |
| /// </summary> |
| public abstract override string ToString(); |
| |
| public virtual bool IsFieldsSubQueryAcceptable => true; |
| |
| /// <summary> Shallow clone. Subclasses must override this if they |
| /// need to clone any members deeply, |
| /// </summary> |
| public virtual object Clone() |
| { |
| object clone = null; |
| try |
| { |
| clone = base.MemberwiseClone(); |
| } |
| catch (Exception e) |
| { |
| throw new InvalidOperationException(e.Message, e); // shouldn't happen |
| } |
| return clone; |
| } |
| |
| /// <summary> |
| /// For subclasses of <see cref="SrndQuery"/> within the namespace |
| /// <see cref="Lucene.Net.QueryParsers.Surround.Query"/> |
| /// it is not necessary to override this method, <see cref="ToString()"/> |
| /// </summary> |
| public override int GetHashCode() |
| { |
| return GetType().GetHashCode() ^ ToString().GetHashCode(); |
| } |
| |
| /// <summary> |
| /// For subclasses of <see cref="SrndQuery"/> within the namespace |
| /// <see cref="Lucene.Net.QueryParsers.Surround.Query"/> |
| /// it is not necessary to override this method, <see cref="ToString()"/> |
| /// </summary> |
| public override bool Equals(object obj) |
| { |
| if (obj == null) |
| return false; |
| if (!GetType().Equals(obj.GetType())) |
| return false; |
| return ToString().Equals(obj.ToString(), StringComparison.Ordinal); |
| } |
| |
| /// <summary> An empty Lucene query </summary> |
| public readonly static Search.Query TheEmptyLcnQuery = new EmptyLcnQuery(); /* no changes allowed */ |
| |
| internal sealed class EmptyLcnQuery : BooleanQuery |
| { |
| public override float Boost |
| { |
| get => base.Boost; |
| set => throw new NotSupportedException(); |
| } |
| |
| public override void Add(BooleanClause clause) |
| { |
| throw new NotSupportedException(); |
| } |
| |
| public override void Add(Search.Query query, Occur occur) |
| { |
| throw new NotSupportedException(); |
| } |
| } |
| } |
| } |