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using System;
namespace Firebase.Database.Query
{
/// <summary>
/// Firebase query which references the child of current node.
/// </summary>
public class ChildQuery : FirebaseQuery
{
private readonly Func<string> pathFactory;
/// <summary>
/// Initializes a new instance of the <see cref="ChildQuery" /> class.
/// </summary>
/// <param name="parent"> The parent. </param>
/// <param name="pathFactory"> The path to the child node. </param>
/// <param name="client"> The owner. </param>
public ChildQuery(FirebaseQuery parent, Func<string> pathFactory, FirebaseClient client)
: base(parent, client)
{
this.pathFactory = pathFactory;
}
/// <summary>
/// Initializes a new instance of the <see cref="ChildQuery" /> class.
/// </summary>
/// <param name="client"> The client. </param>
/// <param name="pathFactory"> The path to the child node. </param>
public ChildQuery(FirebaseClient client, Func<string> pathFactory)
: this(null, pathFactory, client)
{
}
/// <summary>
/// Build the url segment of this child.
/// </summary>
/// <param name="child"> The child of this child. </param>
/// <returns> The <see cref="string" />. </returns>
protected override string BuildUrlSegment(FirebaseQuery child)
{
var s = pathFactory();
if (s != string.Empty && !s.EndsWith("/")) s += '/';
if (!(child is ChildQuery)) return s + ".json";
return s;
}
}
}
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