remove query/index.dart in favor of query/query.dart

Author: Ivan Dlugos

lib/objectbox.dart

@@ -9,4 +9,4 @@ export "src/model.dart";
 export "src/store.dart";
 export "src/box.dart";
 export "src/modelinfo/index.dart";
-export "src/query/index.dart";
+export "src/query/query.dart";

lib/src/box.dart

@@ -9,7 +9,7 @@ import "bindings/flatbuffers.dart";
 import "bindings/helpers.dart";
 import "bindings/structs.dart";
 import "modelinfo/index.dart";
-import "query/index.dart";
+import "query/query.dart";
 
 enum _PutMode {
   Put,

lib/src/query/index.dart

@@ -14,6 +14,26 @@ import "package:ffi/ffi.dart";
 
 part "builder.dart";
 
+class Order {
+  /// Reverts the order from ascending (default) to descending.
+  static final descending = 1;
+
+  /// Makes upper case letters (e.g. "Z") be sorted before lower case letters (e.g. "a").
+  /// If not specified, the default is case insensitive for ASCII characters.
+  static final caseSensitive = 2;
+
+  /// For scalars only: changes the comparison to unsigned (default is signed).
+  static final unsigned = 4;
+
+  /// null values will be put last.
+  /// If not specified, by default null values will be put first.
+  static final nullsLast = 8;
+
+  /// null values should be treated equal to zero (scalars only).
+  static final nullsAsZero = 16;
+}
+
+
 /// The QueryProperty types are responsible for the operator overloading.
 /// A QueryBuilder will be constructed, based on the any / all operations applied.
 /// When build() is called on the QueryBuilder a Query object will be created.