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SlopQueryNode.cs
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SlopQueryNode.cs
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using Lucene.Net.QueryParsers.Flexible.Core.Messages;
using Lucene.Net.QueryParsers.Flexible.Core.Parser;
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="SlopQueryNode"/> represents phrase query with a slop.
///
/// From Lucene FAQ: Is there a way to use a proximity operator (like near or
/// within) with Lucene? There is a variable called slop that allows you to
/// perform NEAR/WITHIN-like queries. By default, slop is set to 0 so that only
/// exact phrases will match. When using TextParser you can use this syntax to
/// specify the slop: "doug cutting"~2 will find documents that contain
/// "doug cutting" as well as ones that contain "cutting doug".
/// </summary>
public class SlopQueryNode : QueryNode, IFieldableNode
{
private int value = 0;
/// <summary>
///
/// </summary>
/// <param name="query">QueryNode Tree with the phrase</param>
/// <param name="value">slop value</param>
public SlopQueryNode(IQueryNode query, int 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);
}
public virtual IQueryNode GetChild()
{
return GetChildren()[0];
}
public virtual int Value => this.value;
private string GetValueString()
{
float f = this.value;
if (f == (long)f)
return "" + (long)f;
else
return "" + f;
}
public override string ToString()
{
return "<slop value='" + GetValueString() + "'>" + "\n"
+ GetChild().ToString() + "\n</slop>";
}
public override string ToQueryString(IEscapeQuerySyntax escapeSyntaxParser)
{
if (GetChild() is null)
return "";
return GetChild().ToQueryString(escapeSyntaxParser) + "~"
+ GetValueString();
}
public override IQueryNode CloneTree()
{
SlopQueryNode clone = (SlopQueryNode)base.CloneTree();
clone.value = this.value;
return clone;
}
public virtual string Field
{
get
{
IQueryNode child = GetChild();
if (child is IFieldableNode fieldableNode)
{
return fieldableNode.Field;
}
return null;
}
set
{
IQueryNode child = GetChild();
if (child is IFieldableNode fieldableNode)
{
fieldableNode.Field = value;
}
}
}
}
}