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namespace Firebase.Database.Query
{
using System;
using System.Globalization;
/// <summary>
/// Represents a firebase filtering query, e.g. "?LimitToLast=10".
/// </summary>
public class FilterQuery : ParameterQuery
{
private readonly Func<string> valueFactory;
private readonly Func<double> doubleValueFactory;
private readonly Func<bool> boolValueFactory;
/// <summary>
/// Initializes a new instance of the <see cref="FilterQuery"/> class.
/// </summary>
/// <param name="parent"> The parent. </param>
/// <param name="filterFactory"> The filter. </param>
/// <param name="valueFactory"> The value for filter. </param>
/// <param name="client"> The owning client. </param>
public FilterQuery(FirebaseQuery parent, Func<string> filterFactory, Func<string> valueFactory,
FirebaseClient client)
: base(parent, filterFactory, client)
{
this.valueFactory = valueFactory;
}
/// <summary>
/// Initializes a new instance of the <see cref="FilterQuery"/> class.
/// </summary>
/// <param name="parent"> The parent. </param>
/// <param name="filterFactory"> The filter. </param>
/// <param name="valueFactory"> The value for filter. </param>
/// <param name="client"> The owning client. </param>
public FilterQuery(FirebaseQuery parent, Func<string> filterFactory, Func<double> valueFactory,
FirebaseClient client)
: base(parent, filterFactory, client)
{
doubleValueFactory = valueFactory;
}
/// <summary>
/// Initializes a new instance of the <see cref="FilterQuery"/> class.
/// </summary>
/// <param name="parent"> The parent. </param>
/// <param name="filterFactory"> The filter. </param>
/// <param name="valueFactory"> The value for filter. </param>
/// <param name="client"> The owning client. </param>
public FilterQuery(FirebaseQuery parent, Func<string> filterFactory, Func<bool> valueFactory,
FirebaseClient client)
: base(parent, filterFactory, client)
{
boolValueFactory = valueFactory;
}
/// <summary>
/// The build url parameter.
/// </summary>
/// <param name="child"> The child. </param>
/// <returns> Url parameter part of the resulting path. </returns>
protected override string BuildUrlParameter(FirebaseQuery child)
{
if (valueFactory != null)
{
if (valueFactory() == null) return $"null";
return $"\"{valueFactory()}\"";
}
else if (doubleValueFactory != null)
{
return doubleValueFactory().ToString(CultureInfo.InvariantCulture);
}
else if (boolValueFactory != null)
{
return $"{boolValueFactory().ToString().ToLower()}";
}
return string.Empty;
}
}
}
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