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PathQueryNode.cs
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PathQueryNode.cs
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using J2N.Text;
using Lucene.Net.QueryParsers.Flexible.Core.Parser;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using JCG = J2N.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="PathQueryNode"/> is used to store queries like
/// /company/USA/California /product/shoes/brown. QueryText are objects that
/// contain the text, begin position and end position in the query.
/// <para>
/// Example how the text parser creates these objects:
/// </para>
/// <code>
/// IList<PathQueryNode.QueryText> values = new List<PathQueryNode.QueryText>();
/// values.Add(new PathQueryNode.QueryText("company", 1, 7));
/// values.Add(new PathQueryNode.QueryText("USA", 9, 12));
/// values.Add(new PathQueryNode.QueryText("California", 14, 23));
/// QueryNode q = new PathQueryNode(values);
/// </code>
/// </summary>
public class PathQueryNode : QueryNode
{
/// <summary>
/// Term text with a beginning and end position
/// </summary>
public class QueryText // LUCENENET specific: Not implementing ICloneable per Microsoft's recommendation
{
private string value = null;
/// <summary>
/// != null The term's begin position.
/// </summary>
private int begin;
/// <summary>
/// The term's end position.
/// </summary>
private int end;
/// <summary>
///
/// </summary>
/// <param name="value">text value</param>
/// <param name="begin">position in the query string</param>
/// <param name="end">position in the query string</param>
public QueryText(string value, int begin, int end)
: base()
{
this.value = value;
this.begin = begin;
this.end = end;
}
public virtual /*QueryText*/ object Clone()
{
QueryText clone = (QueryText)this.MemberwiseClone();
clone.value = this.value;
clone.begin = this.begin;
clone.end = this.end;
return clone;
}
/// <summary>
/// Gets the value
/// </summary>
public virtual string Value => value;
/// <summary>
/// Gets the begin
/// </summary>
public virtual int Begin => begin;
/// <summary>
/// Gets the end
/// </summary>
public virtual int End => end;
public override string ToString()
{
return value + ", " + begin + ", " + end;
}
}
private IList<QueryText> values = null;
/// <summary>
///
/// </summary>
/// <param name="pathElements">List of QueryText objects</param>
public PathQueryNode(IList<QueryText> pathElements)
{
this.values = pathElements;
if (pathElements.Count <= 1)
{
// this should not happen
throw RuntimeException.Create(
"PathQuerynode requires more 2 or more path elements.");
}
}
/// <summary>
/// Gets or Sets the a List with all QueryText elements
/// </summary>
/// <returns>QueryText List size</returns>
public virtual IList<QueryText> PathElements
{
get => values;
set => this.values = value;
}
/// <summary>
/// Returns the a specific QueryText element
/// </summary>
/// <param name="index"></param>
/// <returns>QueryText List size</returns>
public virtual QueryText GetPathElement(int index)
{
return values[index];
}
/// <summary>
/// Returns the <see cref="string"/> value of a specific QueryText element
/// </summary>
/// <returns>The <see cref="string"/> for a specific QueryText element</returns>
public virtual string GetFirstPathElement()
{
return values[0].Value;
}
/// <summary>
/// Returns a List QueryText element from position <paramref name="startIndex"/>
/// </summary>
/// <param name="startIndex"></param>
/// <returns>a List QueryText element from position <paramref name="startIndex"/></returns>
public virtual IList<QueryText> GetPathElements(int startIndex)
{
IList<PathQueryNode.QueryText> rValues = new JCG.List<PathQueryNode.QueryText>();
for (int i = startIndex; i < this.values.Count; i++)
{
rValues.Add((QueryText)this.values[i].Clone());
}
return rValues;
}
private string GetPathString()
{
StringBuilder path = new StringBuilder();
foreach (QueryText pathelement in values)
{
path.Append("/").Append(pathelement.Value);
}
return path.ToString();
}
public override string ToQueryString(IEscapeQuerySyntax escaper)
{
StringBuilder path = new StringBuilder();
path.Append("/").Append(GetFirstPathElement());
foreach (QueryText pathelement in GetPathElements(1))
{
string value = escaper.Escape(new StringCharSequence(pathelement.Value),
CultureInfo.InvariantCulture, EscapeQuerySyntaxType.STRING).ToString();
path.Append("/\"").Append(value).Append("\"");
}
return path.ToString();
}
public override string ToString()
{
QueryText text = this.values[0];
return "<path start='" + text.Begin + "' end='" + text.End + "' path='"
+ GetPathString() + "'/>";
}
public override IQueryNode CloneTree()
{
PathQueryNode clone = (PathQueryNode)base.CloneTree();
// copy children
if (this.values != null)
{
IList<QueryText> localValues = new JCG.List<QueryText>();
foreach (QueryText value in this.values)
{
localValues.Add((QueryText)value.Clone());
}
clone.values = localValues;
}
return clone;
}
}
}