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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Newtonsoft.Json;
namespace Firebase.Database.Query
{
/// <summary>
/// Query extensions providing linq like syntax for firebase server methods.
/// </summary>
public static class QueryExtensions
{
/// <summary>
/// Adds an auth parameter to the query.
/// </summary>
/// <param name="node"> The child. </param>
/// <param name="token"> The auth token. </param>
/// <returns> The <see cref="AuthQuery" />. </returns>
internal static AuthQuery WithAuth(this FirebaseQuery node, string token)
{
return node.WithAuth(() => token);
}
/// <summary>
/// Appends print=silent to save bandwidth.
/// </summary>
/// <param name="node"> The child. </param>
/// <returns> The <see cref="SilentQuery" />. </returns>
internal static SilentQuery Silent(this FirebaseQuery node)
{
return new SilentQuery(node, node.Client);
}
/// <summary>
/// References a sub child of the existing node.
/// </summary>
/// <param name="node"> The child. </param>
/// <param name="path"> The path of sub child. </param>
/// <returns> The <see cref="ChildQuery" />. </returns>
public static ChildQuery Child(this ChildQuery node, string path)
{
return node.Child(() => path);
}
/// <summary>
/// Order data by given <see cref="propertyName" />. Note that this is used mainly for following filtering queries and
/// due to firebase implementation
/// the data may actually not be ordered.
/// </summary>
/// <param name="child"> The child. </param>
/// <param name="propertyName"> The property name. </param>
/// <returns> The <see cref="OrderQuery" />. </returns>
public static OrderQuery OrderBy(this ChildQuery child, string propertyName)
{
return child.OrderBy(() => propertyName);
}
/// <summary>
/// Instructs firebase to send data greater or equal to the <see cref="value" />. This must be preceded by an OrderBy
/// query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery StartAt(this ParameterQuery child, string value)
{
return child.StartAt(() => value);
}
/// <summary>
/// Instructs firebase to send data lower or equal to the <see cref="value" />. This must be preceded by an OrderBy
/// query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EndAt(this ParameterQuery child, string value)
{
return child.EndAt(() => value);
}
/// <summary>
/// Instructs firebase to send data equal to the <see cref="value" />. This must be preceded by an OrderBy query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EqualTo(this ParameterQuery child, string value)
{
return child.EqualTo(() => value);
}
/// <summary>
/// Instructs firebase to send data greater or equal to the <see cref="value" />. This must be preceded by an OrderBy
/// query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery StartAt(this ParameterQuery child, double value)
{
return child.StartAt(() => value);
}
/// <summary>
/// Instructs firebase to send data lower or equal to the <see cref="value" />. This must be preceded by an OrderBy
/// query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EndAt(this ParameterQuery child, double value)
{
return child.EndAt(() => value);
}
/// <summary>
/// Instructs firebase to send data equal to the <see cref="value" />. This must be preceded by an OrderBy query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EqualTo(this ParameterQuery child, double value)
{
return child.EqualTo(() => value);
}
/// <summary>
/// Instructs firebase to send data equal to the <see cref="value" />. This must be preceded by an OrderBy query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="value"> Value to start at. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EqualTo(this ParameterQuery child, bool value)
{
return child.EqualTo(() => value);
}
/// <summary>
/// Instructs firebase to send data equal to null. This must be preceded by an OrderBy query.
/// </summary>
/// <param name="child"> Current node. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery EqualTo(this ParameterQuery child)
{
return child.EqualTo(() => null);
}
/// <summary>
/// Limits the result to first <see cref="count" /> items.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="count"> Number of elements. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery LimitToFirst(this ParameterQuery child, int count)
{
return child.LimitToFirst(() => count);
}
/// <summary>
/// Limits the result to last <see cref="count" /> items.
/// </summary>
/// <param name="child"> Current node. </param>
/// <param name="count"> Number of elements. </param>
/// <returns> The <see cref="FilterQuery" />. </returns>
public static FilterQuery LimitToLast(this ParameterQuery child, int count)
{
return child.LimitToLast(() => count);
}
public static Task PutAsync<T>(this FirebaseQuery query, T obj)
{
return query.PutAsync(JsonConvert.SerializeObject(obj, query.Client.Options.JsonSerializerSettings));
}
public static Task PatchAsync<T>(this FirebaseQuery query, T obj)
{
return query.PatchAsync(JsonConvert.SerializeObject(obj, query.Client.Options.JsonSerializerSettings));
}
public static async Task<FirebaseObject<T>> PostAsync<T>(this FirebaseQuery query, T obj,
bool generateKeyOffline = true)
{
var result =
await query.PostAsync(JsonConvert.SerializeObject(obj, query.Client.Options.JsonSerializerSettings),
generateKeyOffline);
return new FirebaseObject<T>(result.Key, obj);
}
/// <summary>
/// Fan out given item to multiple locations at once. See
/// https://firebase.googleblog.com/2015/10/client-side-fan-out-for-data-consistency_73.html for details.
/// </summary>
/// <typeparam name="T"> Type of object to fan out. </typeparam>
/// <param name="query"> Current node. </param>
/// <param name="item"> Object to fan out. </param>
/// <param name="relativePaths"> Locations where to store the item. </param>
public static async Task FanOut<T>(this ChildQuery child, T item, params string[] relativePaths)
{
if (relativePaths == null) throw new ArgumentNullException(nameof(relativePaths));
var fanoutObject = new Dictionary<string, T>(relativePaths.Length);
foreach (var path in relativePaths) fanoutObject.Add(path, item);
await child.PatchAsync(fanoutObject);
}
}
}
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