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BoostQueryNode.cs
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BoostQueryNode.cs
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using Lucene.Net.QueryParsers.Flexible.Core.Messages;
using Lucene.Net.QueryParsers.Flexible.Core.Parser;
using System.Collections.Generic;
namespace Lucene.Net.QueryParsers.Flexible.Core.Nodes
{
/*
* 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>
/// A <see cref="BoostQueryNode"/> boosts the QueryNode tree which is under this node.
/// So, it must only and always have one child.
///
/// The boost value may vary from 0.0 to 1.0.
/// </summary>
public class BoostQueryNode : QueryNode
{
private float value = 0;
/// <summary>
/// Constructs a boost node
/// </summary>
/// <param name="query">the query to be boosted</param>
/// <param name="value">the boost value, it may vary from 0.0 to 1.0</param>
public BoostQueryNode(IQueryNode query, float value)
{
// LUCENENET: Factored out NLS/Message/IMessage so end users can optionally utilize the built-in .NET localization.
// LUCENENET: Added paramName parameter and changed to the same error message as the default of ArgumentNullException.
// However, we still need this to be an error type so it is not caught in StandardSyntaxParser.
if (query is null)
throw new QueryNodeError(QueryParserMessages.ARGUMENT_CANNOT_BE_NULL, nameof(query));
this.value = value;
IsLeaf = false;
Allocate();
Add(query);
}
/// <summary>
/// Gets the single child which this node boosts.
/// </summary>
public virtual IQueryNode Child
{
get
{
IList<IQueryNode> children = GetChildren();
if (children is null || children.Count == 0)
{
return null;
}
return children[0];
}
}
/// <summary>
/// Gets the boost value. It may vary from 0.0 to 1.0.
/// </summary>
public virtual float Value => this.value;
/// <summary>
/// Returns the boost value parsed to a string.
/// </summary>
/// <returns>the parsed value</returns>
private string GetValueString()
{
float f = this.value;
if (f == (long)f)
return "" + (long)f;
else
return "" + f.ToString("0.0#######"); // LUCENENET TODO: Culture
}
public override string ToString()
{
return "<boost value='" + GetValueString() + "'>" + "\n"
+ Child.ToString() + "\n</boost>";
}
public override string ToQueryString(IEscapeQuerySyntax escapeSyntaxParser)
{
if (Child is null)
return "";
return Child.ToQueryString(escapeSyntaxParser) + "^"
+ GetValueString();
}
public override IQueryNode CloneTree()
{
BoostQueryNode clone = (BoostQueryNode)base.CloneTree();
clone.value = this.value;
return clone;
}
}
}