| // Lucene version compatibility level 4.8.1 |
| using J2N.Numerics; |
| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function.DocValues; |
| using Lucene.Net.Search; |
| using System.Collections; |
| using System.Globalization; |
| |
| namespace Lucene.Net.Queries.Function.ValueSources |
| { |
| /* |
| * 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> |
| /// <see cref="LinearSingleFunction"/> implements a linear function over |
| /// another <see cref="ValueSource"/>. |
| /// <para/> |
| /// Normally Used as an argument to a <see cref="FunctionQuery"/> |
| /// <para/> |
| /// NOTE: This was LinearFloatFunction in Lucene |
| /// </summary> |
| public class LinearSingleFunction : ValueSource |
| { |
| protected readonly ValueSource m_source; |
| protected readonly float m_slope; |
| protected readonly float m_intercept; |
| |
| public LinearSingleFunction(ValueSource source, float slope, float intercept) |
| { |
| this.m_source = source; |
| this.m_slope = slope; |
| this.m_intercept = intercept; |
| } |
| |
| public override string GetDescription() |
| { |
| return m_slope + "*float(" + m_source.GetDescription() + ")+" + m_intercept; |
| } |
| |
| public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext) |
| { |
| FunctionValues vals = m_source.GetValues(context, readerContext); |
| return new SingleDocValuesAnonymousClass(this, this, vals); |
| } |
| |
| private class SingleDocValuesAnonymousClass : SingleDocValues |
| { |
| private readonly LinearSingleFunction outerInstance; |
| private readonly FunctionValues vals; |
| |
| public SingleDocValuesAnonymousClass(LinearSingleFunction outerInstance, LinearSingleFunction @this, FunctionValues vals) |
| : base(@this) |
| { |
| this.outerInstance = outerInstance; |
| this.vals = vals; |
| } |
| |
| /// <summary> |
| /// NOTE: This was floatVal() in Lucene |
| /// </summary> |
| public override float SingleVal(int doc) |
| { |
| return vals.SingleVal(doc) * outerInstance.m_slope + outerInstance.m_intercept; |
| } |
| |
| public override string ToString(int doc) |
| { |
| // LUCENENET specific - changed formatting to ensure the same culture is used for each value. |
| return string.Format("{0}*float({1})+{2}", |
| outerInstance.m_slope, |
| vals.ToString(doc), |
| outerInstance.m_intercept); |
| } |
| } |
| |
| public override void CreateWeight(IDictionary context, IndexSearcher searcher) |
| { |
| m_source.CreateWeight(context, searcher); |
| } |
| |
| public override int GetHashCode() |
| { |
| int h = J2N.BitConversion.SingleToInt32Bits(m_slope); |
| h = (h.TripleShift(2)) | (h << 30); |
| h += J2N.BitConversion.SingleToInt32Bits(m_intercept); |
| h ^= (h << 14) | (h.TripleShift(19)); |
| return h + m_source.GetHashCode(); |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (!(o is LinearSingleFunction other)) |
| return false; |
| return this.m_slope == other.m_slope && this.m_intercept == other.m_intercept && this.m_source.Equals(other.m_source); |
| } |
| } |
| } |