| using Lucene.Net.Support; |
| using System.Collections.Generic; |
| using System.Text; |
| using Toffs = Lucene.Net.Search.VectorHighlight.FieldPhraseList.WeightedPhraseInfo.Toffs; |
| using WeightedPhraseInfo = Lucene.Net.Search.VectorHighlight.FieldPhraseList.WeightedPhraseInfo; |
| |
| 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> |
| /// FieldFragList has a list of "frag info" that is used by <see cref="IFragmentsBuilder"/> class |
| /// to create fragments (snippets). |
| /// </summary> |
| public abstract class FieldFragList |
| { |
| private readonly List<WeightedFragInfo> fragInfos = new List<WeightedFragInfo>(); |
| |
| /// <summary> |
| /// a constructor. |
| /// </summary> |
| /// <param name="fragCharSize">the length (number of chars) of a fragment</param> |
| #pragma warning disable IDE0060 // Remove unused parameter |
| protected FieldFragList(int fragCharSize) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected) |
| #pragma warning restore IDE0060 // Remove unused parameter |
| { |
| } |
| |
| /// <summary> |
| /// convert the list of <see cref="WeightedPhraseInfo"/> to <see cref="WeightedFragInfo"/>, then add it to the fragInfos |
| /// </summary> |
| /// <param name="startOffset">start offset of the fragment</param> |
| /// <param name="endOffset">end offset of the fragment</param> |
| /// <param name="phraseInfoList">list of <see cref="WeightedPhraseInfo"/> objects</param> |
| public abstract void Add(int startOffset, int endOffset, IList<WeightedPhraseInfo> phraseInfoList); |
| |
| /// <summary> |
| /// return the list of <see cref="WeightedFragInfo"/>s. |
| /// </summary> |
| public virtual IList<WeightedFragInfo> FragInfos => fragInfos; |
| |
| /// <summary> |
| /// List of term offsets + weight for a frag info |
| /// </summary> |
| public class WeightedFragInfo |
| { |
| private readonly IList<SubInfo> subInfos; // LUCENENET: marked readonly |
| private readonly float totalBoost; // LUCENENET: marked readonly |
| private readonly int startOffset; // LUCENENET: marked readonly |
| private readonly int endOffset; // LUCENENET: marked readonly |
| |
| public WeightedFragInfo(int startOffset, int endOffset, IList<SubInfo> subInfos, float totalBoost) |
| { |
| this.startOffset = startOffset; |
| this.endOffset = endOffset; |
| this.totalBoost = totalBoost; |
| this.subInfos = subInfos; |
| } |
| |
| public IList<SubInfo> SubInfos => subInfos; |
| |
| public float TotalBoost => totalBoost; |
| |
| public int StartOffset => startOffset; |
| |
| public int EndOffset => endOffset; |
| |
| public override string ToString() |
| { |
| StringBuilder sb = new StringBuilder(); |
| sb.Append("subInfos=("); |
| foreach (SubInfo si in subInfos) |
| sb.Append(si.ToString()); |
| sb.Append(")/").Append(Number.ToString(totalBoost)).Append('(').Append(startOffset).Append(',').Append(endOffset).Append(')'); |
| return sb.ToString(); |
| } |
| |
| /// <summary> |
| /// Represents the list of term offsets for some text |
| /// </summary> |
| public class SubInfo |
| { |
| private readonly string text; // unnecessary member, just exists for debugging purpose |
| private readonly IList<Toffs> termsOffsets; // usually termsOffsets.size() == 1, |
| // but if position-gap > 1 and slop > 0 then size() could be greater than 1 |
| private readonly int seqnum; |
| private readonly float boost; // used for scoring split WeightedPhraseInfos. |
| |
| public SubInfo(string text, IList<Toffs> termsOffsets, int seqnum, float boost) |
| { |
| this.text = text; |
| this.termsOffsets = termsOffsets; |
| this.seqnum = seqnum; |
| this.boost = boost; |
| } |
| |
| public virtual IList<Toffs> TermsOffsets => termsOffsets; |
| |
| public virtual int Seqnum => seqnum; |
| |
| public virtual string Text => text; |
| |
| public virtual float Boost => boost; |
| |
| public override string ToString() |
| { |
| StringBuilder sb = new StringBuilder(); |
| sb.Append(text).Append('('); |
| foreach (Toffs to in termsOffsets) |
| sb.Append(to.ToString()); |
| sb.Append(')'); |
| return sb.ToString(); |
| } |
| } |
| } |
| } |
| } |