| using Lucene.Net.Util; |
| using System; |
| using System.Runtime.InteropServices; |
| |
| namespace Lucene.Net.Facet |
| { |
| /* |
| * 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> |
| /// Keeps highest results, first by largest <see cref="float"/> value, |
| /// then tie break by smallest ord. |
| /// <para/> |
| /// NOTE: This was TopOrdAndFloatQueue in Lucene |
| /// </summary> |
| public class TopOrdAndSingleQueue : PriorityQueue<OrdAndValue<float>> |
| { |
| // LUCENENET specific - de-nested OrdAndValue and made it into a generic struct |
| // so it can be used with this class and TopOrdAndInt32Queue |
| |
| /// <summary> |
| /// Sole constructor. |
| /// </summary> |
| public TopOrdAndSingleQueue(int topN) : base(topN, false) |
| { |
| } |
| |
| protected internal override bool LessThan(OrdAndValue<float> a, OrdAndValue<float> b) |
| { |
| if (a.Value < b.Value) |
| { |
| return true; |
| } |
| else if (a.Value > b.Value) |
| { |
| return false; |
| } |
| else |
| { |
| return a.Ord > b.Ord; |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Holds a single entry. |
| /// </summary> |
| // LUCENENET specific - de-nested this and made it into a struct so it can be shared |
| [StructLayout(LayoutKind.Sequential)] |
| public sealed class OrdAndValue<T> : IEquatable<OrdAndValue<T>> |
| { |
| /// <summary> |
| /// Ordinal of the entry. </summary> |
| public int Ord; |
| |
| /// <summary> |
| /// Value associated with the ordinal. </summary> |
| public T Value; |
| |
| /// <summary> |
| /// Default constructor. |
| /// </summary> |
| public OrdAndValue(int ord, T value) |
| { |
| Ord = ord; |
| Value = value; |
| } |
| |
| #region Added for better .NET support |
| public override bool Equals(object obj) |
| { |
| return obj is OrdAndValue<T> other && Equals(other); |
| } |
| |
| public bool Equals(OrdAndValue<T> other) |
| { |
| return this.Ord == other.Ord && this.Value.Equals(other.Value); |
| } |
| |
| public override int GetHashCode() |
| { |
| return this.Ord.GetHashCode() ^ this.Value.GetHashCode(); |
| } |
| |
| public static bool operator ==(OrdAndValue<T> left, OrdAndValue<T> right) |
| { |
| return left.Equals(right); |
| } |
| |
| public static bool operator !=(OrdAndValue<T> left, OrdAndValue<T> right) |
| { |
| return !(left == right); |
| } |
| #endregion |
| } |
| } |