/
ScoreOrderFragmentsBuilder.cs
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/
ScoreOrderFragmentsBuilder.cs
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using Lucene.Net.Util;
using System;
using System.Collections.Generic;
using WeightedFragInfo = Lucene.Net.Search.VectorHighlight.FieldFragList.WeightedFragInfo;
namespace Lucene.Net.Search.VectorHighlight
{
/*
* 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>
/// An implementation of FragmentsBuilder that outputs score-order fragments.
/// </summary>
public class ScoreOrderFragmentsBuilder : BaseFragmentsBuilder
{
/// <summary>
/// a constructor.
/// </summary>
public ScoreOrderFragmentsBuilder()
: base()
{
}
/// <summary>
/// a constructor.
/// </summary>
/// <param name="preTags">array of pre-tags for markup terms.</param>
/// <param name="postTags">array of post-tags for markup terms.</param>
public ScoreOrderFragmentsBuilder(string[] preTags, string[] postTags)
: base(preTags, postTags)
{
}
public ScoreOrderFragmentsBuilder(IBoundaryScanner bs)
: base(bs)
{
}
public ScoreOrderFragmentsBuilder(string[] preTags, string[] postTags, IBoundaryScanner bs)
: base(preTags, postTags, bs)
{
}
/// <summary>
/// Sort by score the list of <see cref="WeightedFragInfo"/>
/// </summary>
public override IList<WeightedFragInfo> GetWeightedFragInfoList(IList<WeightedFragInfo> src)
{
CollectionUtil.TimSort(src, ScoreComparer.Default);
return src;
}
/// <summary>
/// <see cref="IComparer{T}"/> for <see cref="WeightedFragInfo"/> by boost, breaking ties
/// by offset.
/// </summary>
// LUCENENET: It is no longer good practice to use binary serialization.
// See: https://github.com/dotnet/corefx/issues/23584#issuecomment-325724568
#if FEATURE_SERIALIZABLE
[Serializable]
#endif
public class ScoreComparer : IComparer<WeightedFragInfo>
{
private ScoreComparer() { } // Singleton only
/// <summary>
/// Returns a default score comparer.
/// </summary>
public static IComparer<WeightedFragInfo> Default { get; } = new ScoreComparer(); // LUCENENET specific: use singleton pattern
public virtual int Compare(WeightedFragInfo o1, WeightedFragInfo o2)
{
if (o1.TotalBoost > o2.TotalBoost) return -1;
else if (o1.TotalBoost < o2.TotalBoost) return 1;
// if same score then check startOffset
else
{
if (o1.StartOffset < o2.StartOffset) return -1;
else if (o1.StartOffset > o2.StartOffset) return 1;
}
return 0;
}
}
}
}