adds layer.getUsage()

doc/offlinefeaturesmanager.md

@@ -87,6 +87,7 @@ Methods | Returns | Description
 `getPhantomLayerGraphics( callback) ` | `callback( graphicsLayerJSON)` | Used with offline browser restarts. Returns a JSON representation of the internal phantom graphics layer. This layer is designed to indicate to the user any graphic that has been modified while offline. The appcache-features.html sample demonstrates this pattern.
 `addAttachments()` | Internal | Adds an attachment.
 `deleteAttachments()` | Internal | Deletes an attachment.
+`getUsage(callback)`| `callback({usage}, error)` | **New @ v2.5** Returns the approximate size of the database in bytes. the usage Object is {sizeBytes: number, editCount: number}.
 `getPhantomGraphicsArray( callback)` | `callback(boolean, array)` | **New @ v2.5** Used with offline browser restarts. Returns an array of phantom graphics from the database.
 `getAllEditsArray(callback)` | `callback(boolean, array)` | **New @ v2.5** Returns an array of all edits stored in the database.
 `getFeatureLayerJSON(url,callback)` | `callback( boolean, JSON )` | **New @ v2.5.** Retrieves the feature layer's JSON using `f=json` parameter.

lib/edit/editsStore.js

@@ -798,7 +798,7 @@ O.esri.Edit.EditStore = function () {
     /**
      * Returns the approximate size of the database in bytes
      * IMPORTANT: Currently requires all data be serialized!
-     * @param callback  {usage, error} Whereas, the usage Object is {sizeBytes: number, editCount: number}
+     * @param callback  callback({usage}, error) Whereas, the usage Object is {sizeBytes: number, editCount: number}
      */
     this.getUsage = function (callback) {
         console.assert(this._db !== null, "indexeddb not initialized");

lib/edit/offlineFeaturesManager.js

@@ -543,6 +543,16 @@ define([
                         });
                     };
 
+                    /**
+                     * Returns the approximate size of the database in bytes
+                     * @param callback callback({usage}, error) Whereas, the usage Object is {sizeBytes: number, editCount: number}
+                     */
+                    layer.getUsage = function(callback){
+                        self._editStore.getUsage(function(usage,error){
+                            callback(usage,error);
+                        });
+                    };
+
                     /**
                      * Create a featureDefinition
                      * @param featureLayer

test/spec/offlineFeaturesManagerSpec.js

@@ -410,7 +410,7 @@ describe("Offline Editing", function()
 	});
 
     async.it("check db size", function(done){
-       g_editsStore.getUsage(function(usage,error){
+       g_featureLayers[0].getUsage(function(usage,error){
            expect(usage.sizeBytes).toBe(7834);
            expect(usage.editCount).toBe(9);
            expect(error).toBe(null);