public MobileServiceCollection(IMobileServiceTableQuery <TTable> query, Func <IEnumerable <TTable>, IEnumerable <TCollection> > selector, int pageSize = 0)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
if (pageSize < 0)
{
throw new ArgumentOutOfRangeException("pageSize");
}
this.query = query;
MobileServiceTableQuery <TTable> tableQuery = query as MobileServiceTableQuery <TTable>;
if (tableQuery != null)
{
tableQuery.QueryProvider.Features = MobileServiceFeatures.TableCollection;
}
this.selectorFunction = selector;
this.pageSize = pageSize;
this.HasMoreItems = true;
}
/// <summary>
/// Create a new query based off an existing query and and a new
/// queryable. This is used via MobileServiceTableQueryable's
/// combinators to construct new queries from simpler base queries.
/// </summary>
/// <param name="baseQuery">The base query.</param>
/// <param name="query">The new queryable.</param>
/// <param name="includeTotalCount">
/// A value that if set will determine whether the query will request
/// the total count for all the records that would have been returned
/// ignoring any take paging/limit clause specified by client or
/// server. If this value is not set, we'll use the baseQuery's
/// RequestTotalProperty instead (this is specifically so that our
/// IncludeTotalCount method will preserve state on the old query).
/// </param>
/// <param name="parameters">
/// The optional user-defined query string parameters to include with the query.
/// </param>
/// <returns>The new query.</returns>
internal static MobileServiceTableQuery <T> Create(MobileServiceTableQuery <T> baseQuery, IQueryable <T> query, bool?includeTotalCount = null, IDictionary <string, string> parameters = null)
{
Debug.Assert(baseQuery != null, "baseQuery cannot be null!");
Debug.Assert(query != null, "query cannot be null!");
// Merge parameters if the baseQuery already has a collection of parameters
if (baseQuery.Parameters != null)
{
if (parameters == null)
{
parameters = baseQuery.Parameters;
}
else
{
parameters = new Dictionary <string, string>(parameters);
foreach (var parameter in baseQuery.Parameters)
{
parameters.Add(parameter);
}
}
}
// NOTE: Make sure any changes to this logic are reflected in the
// Select method below which has its own version of this code to
// work around type changes for its projection.
return(new MobileServiceTableQuery <T>(
baseQuery.Table,
includeTotalCount ?? baseQuery.RequestTotalCount,
parameters)
{
Query = query
});
}
/// <summary>
/// Execute a query and return its results.
/// </summary>
/// <typeparam name="T">
/// The type of element returned by the query.
/// </typeparam>
/// <param name="query">
/// The query to evaluate and get the results for.
/// </param>
/// <returns>
/// Results of the query.
/// </returns>
internal async Task <IEnumerable <T> > Execute <T>(MobileServiceTableQuery <T> query)
{
// Compile the query from the underlying IQueryable's expression
// tree
MobileServiceTableQueryDescription compiledQuery = this.Compile(query);
// Send the query
string odata = compiledQuery.ToQueryString();
JToken response = await query.Table.ReadAsync(odata, query.Parameters);
// Parse the results
long totalCount;
JArray values = this.GetResponseSequence(response, out totalCount);
return(new TotalCountEnumerable <T>(
totalCount,
query.Table.MobileServiceClient.Serializer.Deserialize(values, compiledQuery.ProjectionArgumentType).Select(
value =>
{
// Apply the projection to the instance transforming it
// as desired
foreach (Delegate projection in compiledQuery.Projections)
{
value = projection.DynamicInvoke(value);
}
return (T)value;
})));
}
/// <summary>
/// Initializes a new instance of the MobileServiceTableQueryTranslator
/// class.
/// </summary>
/// <param name="query">
/// The <see cref="T:MobileServiceTableQuery`1{T}"/> which
/// is being translated.
/// </param>
internal MobileServiceTableQueryTranslator(MobileServiceTableQuery <T> query)
{
Debug.Assert(query != null);
this.query = query;
this.queryDescription = new MobileServiceTableQueryDescription(query.Table.TableName, query.RequestTotalCount);
}
public Task <IEnumerable <U> > ReadAsync <U>(MobileServiceTableQuery <U> query)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
return(EvaluateQueryAsync <U>(this, query.Compile()));
}
/// <summary>
/// Compile the query into a MobileServiceTableQueryDescription.
/// </summary>
/// <returns>
/// The compiled OData query.
/// </returns>
internal MobileServiceTableQueryDescription Compile <T>(MobileServiceTableQuery <T> query)
{
// Compile the query from the underlying IQueryable's expression
// tree
MobileServiceTableQueryTranslator <T> translator = new MobileServiceTableQueryTranslator <T>(query);
MobileServiceTableQueryDescription compiledQuery = translator.Translate();
return(compiledQuery);
}
/// <summary>
/// Create a new query based off an existing query and and a new
/// queryable. This is used via MobileServiceTableQueryable's
/// combinators to construct new queries from simpler base queries.
/// </summary>
/// <param name="baseQuery">The base query.</param>
/// <param name="query">The new queryable.</param>
/// <param name="includeTotalCount">
/// A value that if set will determine whether the query will request
/// the total count for all the records that would have been returned
/// ignoring any take paging/limit clause specified by client or
/// server. If this value is not set, we'll use the baseQuery's
/// RequestTotalProperty instead (this is specifically so that our
/// IncludeTotalCount method will preserve state on the old query).
/// </param>
/// <returns>The new query.</returns>
internal static MobileServiceTableQuery <T> Create(MobileServiceTableQuery <T> baseQuery, IQueryable <T> query, bool?includeTotalCount = null)
{
Debug.Assert(baseQuery != null, "baseQuery cannot be null!");
Debug.Assert(query != null, "query cannot be null!");
// NOTE: Make sure any changes to this logic are reflected in the
// Select method below which has its own version of this code to
// work around type changes for its projection.
return(new MobileServiceTableQuery <T>(
baseQuery.Table,
includeTotalCount ?? baseQuery.RequestTotalCount)
{
Query = query
});
}