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namespace Firebase.Database.Query
{
using System;
/// <summary>
/// Represents a parameter in firebase query, e.g. "?data=foo".
/// </summary>
public abstract class ParameterQuery : FirebaseQuery
{
private readonly Func<string> parameterFactory;
private readonly string separator;
/// <summary>
/// Initializes a new instance of the <see cref="ParameterQuery"/> class.
/// </summary>
/// <param name="parent"> The parent of this query. </param>
/// <param name="parameterFactory"> The parameter. </param>
/// <param name="client"> The owning client. </param>
protected ParameterQuery(FirebaseQuery parent, Func<string> parameterFactory, FirebaseClient client)
: base(parent, client)
{
this.parameterFactory = parameterFactory;
this.separator = (this.Parent is ChildQuery) ? "?" : "&";
}
/// <summary>
/// Build the url segment represented by this query.
/// </summary>
/// <param name="child"> The child. </param>
/// <returns> The <see cref="string"/>. </returns>
protected override string BuildUrlSegment(FirebaseQuery child)
{
return $"{this.separator}{this.parameterFactory()}={this.BuildUrlParameter(child)}";
}
/// <summary>
/// The build url parameter.
/// </summary>
/// <param name="child"> The child. </param>
/// <returns> The <see cref="string"/>. </returns>
protected abstract string BuildUrlParameter(FirebaseQuery child);
}
}
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