/// <summary>
/// Evaluate a query and return its results.
/// </summary>
/// <typeparam name="U">
/// The type of element returned by the query.
/// </typeparam>
/// <param name="table">
/// Access to MobileServices table operations.
/// </param>
/// <param name="query">
/// The description of the query to evaluate and get the results for.
/// </param>
/// <returns>Results of the query.</returns>
internal static Task <IEnumerable <U> > EvaluateQueryAsync <U>(IMobileServiceTable <T> table, MobileServiceTableQueryDescription query)
{
Debug.Assert(query != null, "query cannot be null!");
Debug.Assert(table != null, "table cannot be null!");
// Send the query
string odata = query.ToString();
return(table.ReadAsync(odata, query.Parameters).ContinueWith(t =>
{
// Parse the results
long totalCount;
JsonArray values = MobileServiceTable <T> .GetResponseSequence(t.Result, out totalCount);
return (IEnumerable <U>) new TotalCountEnumerable <U>(
totalCount,
values.Select(
item =>
{
// Create and fill a new instance of the type we should
// deserialize (which is either T or the input param
// to the projection that will modify T).
object obj = Activator.CreateInstance(query.ProjectionArgumentType ?? typeof(U));
MobileServiceTableSerializer.Deserialize(item, obj);
// Apply the projection to the instance transforming it
// as desired
if (query.Projection != null)
{
obj = query.Projection.DynamicInvoke(obj);
}
return (U)obj;
}));
}));
}
/// <summary>
/// Refresh the current instance with the latest values from the
/// table.
/// </summary>
/// <param name="instance">The instance to refresh.</param>
/// <param name="parameters">A dictionary of user-defined parameters and values to include in the request URI query string.</param>
/// <returns>
/// A task that will complete when the refresh has finished.
/// </returns>
public Task RefreshAsync(T instance, IDictionary <string, string> parameters)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Only refresh if it's already on the server
SerializableType type = SerializableType.Get(typeof(T));
object id = type.IdMember.GetValue(instance);
TaskCompletionSource <bool> tcs = new TaskCompletionSource <bool>();
if (!SerializableType.IsDefaultIdValue(id))
{
// Get the latest version of this element
GetSingleValueAsync(id, parameters).ContinueWith(t =>
{
// Deserialize that value back into the current instance
MobileServiceTableSerializer.Deserialize(t.Result, instance);
tcs.SetResult(true);
});
}
else
{
tcs.SetResult(true);
}
return(tcs.Task);
}
/// <summary>
/// Delete an instance from the table.
/// </summary>
/// <param name="instance">The instance to delete.</param>
/// <param name="parameters">A dictionary of user-defined parameters and values to include in the request URI query string.</param>
/// <returns>
/// A task that will complete when the delete has finished.
/// </returns>
public Task DeleteAsync(T instance, IDictionary <string, string> parameters)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JsonObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
// Send the request
return(DeleteAsync(value, parameters)
.ContinueWith(t =>
{
if (t.IsFaulted)
{
throw t.Exception.InnerException;
}
// Clear the instance ID since it's no longer associated with that
// ID on the server (note that reflection is goodly enough to turn
// null into the correct value for us).
SerializableType type = SerializableType.Get(typeof(T));
type.IdMember.SetValue(instance, null);
}));
}
/// <summary>
/// Get an element from a table by its ID.
/// </summary>
/// <param name="id">The ID of the element.</param>
/// <returns>The desired element.</returns>
public Task <T> LookupAsync(object id)
{
// TODO: At some point in the future this will be involved in our
// caching story and relationships across tables via foreign
// keys.
return(SendLookupAsync(id).ContinueWith(t => MobileServiceTableSerializer.Deserialize <T> (t.Result.AsObject())));
}
/// <summary>
/// Get an element from a table by its ID.
/// </summary>
/// <param name="id">The ID of the element.</param>
/// <returns>The desired element.</returns>
public async Task <T> LookupAsync(object id)
{
// TODO: At some point in the future this will be involved in our
// caching story and relationships across tables via foreign
// keys.
JToken value = await this.SendLookupAsync(id);
return(MobileServiceTableSerializer.Deserialize <T>(value.AsObject()));
}
/// <summary>
/// Get an element from a table by its ID.
/// </summary>
/// <param name="id">The ID of the element.</param>
/// <param name="parameters">
/// A dictionary of user-defined parameters and values to include in the request URI query string.
/// </param>
/// <returns>The desired element.</returns>
public new async Task <T> LookupAsync(object id, IDictionary <string, string> parameters)
{
// TODO: At some point in the future this will be involved in our
// caching story and relationships across tables via foreign
// keys.
IJsonValue value = await this.SendLookupAsync(id, parameters);
return(MobileServiceTableSerializer.Deserialize <T>(value.AsObject()));
}
/// <summary>
/// Insert a new instance into the table.
/// </summary>
/// <param name="instance">The instance to insert.</param>
/// <param name="parameters">A dictionary of user-defined parameters and values to include in the request URI query string.</param>
/// <returns>
/// A task that will complete when the insertion has finished.
/// </returns>
public Task InsertAsync(T instance, IDictionary <string, string> parameters)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JsonObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
return(InsertAsync(value, parameters)
.ContinueWith(t => MobileServiceTableSerializer.Deserialize(t.Result, instance)));
}
/// <summary>
/// Updates an instance in the table.
/// </summary>
/// <param name="instance">The instance to update.</param>
/// <returns>
/// A task that will complete when the update has finished.
/// </returns>
public Task UpdateAsync(T instance)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JsonObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
// Send the request
return(UpdateAsync(value)
.ContinueWith(t => MobileServiceTableSerializer.Deserialize(t.Result, instance)));
}
/// <summary>
/// Updates an instance in the table.
/// </summary>
/// <param name="instance">The instance to update.</param>
/// <returns>
/// A task that will complete when the update has finished.
/// </returns>
public async Task UpdateAsync(T instance)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
// Send the request
JToken response = await this.UpdateAsync(value);
// Deserialize the response back into the instance in case any
// server scripts changed values of the instance.
MobileServiceTableSerializer.Deserialize(response, instance);
}
/// <summary>
/// Updates an instance in the table.
/// </summary>
/// <param name="instance">The instance to update.</param>
/// <param name="parameters">
/// A dictionary of user-defined parameters and values to include in the request URI query string.
/// </param>
/// <returns>
/// A task that will complete when the update has finished.
/// </returns>
public async Task UpdateAsync(T instance, IDictionary <string, string> parameters)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JsonObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
// Send the request
IJsonValue response = await this.UpdateAsync(value, parameters);
// Deserialize the response back into the instance in case any
// server scripts changed values of the instance.
MobileServiceTableSerializer.Deserialize(response, instance);
}
/// <summary>
/// Delete an instance from the table.
/// </summary>
/// <param name="instance">The instance to delete.</param>
/// <returns>
/// A task that will complete when the delete has finished.
/// </returns>
public async Task DeleteAsync(T instance)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Serialize the instance
JObject value = MobileServiceTableSerializer.Serialize(instance).AsObject();
// Send the request
await this.DeleteAsync(value);
// Clear the instance ID since it's no longer associated with that
// ID on the server (note that reflection is goodly enough to turn
// null into the correct value for us).
SerializableType type = SerializableType.Get(typeof(T));
type.IdMember.SetValue(instance, null);
}
/// <summary>
/// Refresh the current instance with the latest values from the
/// table.
/// </summary>
/// <param name="instance">The instance to refresh.</param>
/// <returns>
/// A task that will complete when the refresh has finished.
/// </returns>
public async Task RefreshAsync(T instance)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
// Only refresh if it's already on the server
SerializableType type = SerializableType.Get(typeof(T));
object id = type.IdMember.GetValue(instance);
if (!SerializableType.IsDefaultIdValue(id))
{
// Get the latest version of this element
JObject obj = await this.GetSingleValueAsync(id);
// Deserialize that value back into the current instance
MobileServiceTableSerializer.Deserialize(obj, instance);
}
}
