| using System.Collections.Generic; |
| using System.Text; |
| |
| namespace Lucene.Net.Search |
| { |
| /* |
| * 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> |
| /// Expert: Describes the score computation for document and query. </summary> |
| public class Explanation |
| { |
| private float val; // the value of this node |
| private string description; // what it represents |
| private List<Explanation> details; // sub-explanations |
| |
| public Explanation() |
| { |
| } |
| |
| public Explanation(float value, string description) |
| { |
| this.val = value; |
| this.description = description; |
| } |
| |
| /// <summary> |
| /// Indicates whether or not this <see cref="Explanation"/> models a good match. |
| /// |
| /// <para> |
| /// By default, an Explanation represents a "match" if the value is positive. |
| /// </para> </summary> |
| /// <seealso cref="Value"/> |
| public virtual bool IsMatch => (0.0f < Value); |
| |
| /// <summary> |
| /// Gets or Sets the value assigned to this explanation node. </summary> |
| public virtual float Value |
| { |
| get => val; |
| set => this.val = value; |
| } |
| |
| /// <summary> |
| /// Gets or Sets the description of this explanation node. </summary> |
| public virtual string Description |
| { |
| get => description; |
| set => this.description = value; |
| } |
| |
| /// <summary> |
| /// A short one line summary which should contain all high level |
| /// information about this <see cref="Explanation"/>, without the "Details" |
| /// </summary> |
| protected virtual string GetSummary() |
| { |
| return Value + " = " + Description; |
| } |
| |
| /// <summary> |
| /// The sub-nodes of this explanation node. </summary> |
| public virtual Explanation[] GetDetails() |
| { |
| if (details == null) |
| { |
| return null; |
| } |
| return details.ToArray(); |
| } |
| |
| /// <summary> |
| /// Adds a sub-node to this explanation node. </summary> |
| public virtual void AddDetail(Explanation detail) |
| { |
| if (details == null) |
| { |
| details = new List<Explanation>(); |
| } |
| details.Add(detail); |
| } |
| |
| /// <summary> |
| /// Render an explanation as text. </summary> |
| public override string ToString() |
| { |
| return ToString(0); |
| } |
| |
| protected internal virtual string ToString(int depth) |
| { |
| StringBuilder buffer = new StringBuilder(); |
| for (int i = 0; i < depth; i++) |
| { |
| buffer.Append(" "); |
| } |
| buffer.Append(GetSummary()); |
| buffer.Append("\n"); |
| |
| Explanation[] details = GetDetails(); |
| if (details != null) |
| { |
| for (int i = 0; i < details.Length; i++) |
| { |
| buffer.Append(details[i].ToString(depth + 1)); |
| } |
| } |
| |
| return buffer.ToString(); |
| } |
| |
| /// <summary> |
| /// Render an explanation as HTML. </summary> |
| public virtual string ToHtml() |
| { |
| StringBuilder buffer = new StringBuilder(); |
| buffer.Append("<ul>\n"); |
| |
| buffer.Append("<li>"); |
| buffer.Append(GetSummary()); |
| buffer.Append("<br />\n"); |
| |
| Explanation[] details = GetDetails(); |
| if (details != null) |
| { |
| for (int i = 0; i < details.Length; i++) |
| { |
| buffer.Append(details[i].ToHtml()); |
| } |
| } |
| |
| buffer.Append("</li>\n"); |
| buffer.Append("</ul>\n"); |
| |
| return buffer.ToString(); |
| } |
| } |
| } |