Implemented update checking functionality

include/AdblockPlus/FilterEngine.h

Index: include/AdblockPlus/FilterEngine.h
===================================================================
--- a/include/AdblockPlus/FilterEngine.h
+++ b/include/AdblockPlus/FilterEngine.h
@@ -13,19 +13,20 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef ADBLOCK_PLUS_FILTER_ENGINE_H
 #define ADBLOCK_PLUS_FILTER_ENGINE_H
 
-#include <vector>
+#include <functional>
 #include <map>
 #include <string>
+#include <vector>
 #include <AdblockPlus/JsEngine.h>
 #include <AdblockPlus/JsValue.h>
 
 #include "tr1_memory.h"
 
 namespace AdblockPlus
 {
   class FilterEngine;
@@ -62,33 +63,38 @@ namespace AdblockPlus
   };
 
   typedef std::tr1::shared_ptr<Filter> FilterPtr;
   typedef std::tr1::shared_ptr<Subscription> SubscriptionPtr;
 
   class FilterEngine
   {
   public:
+    typedef std::function<void(const std::string&)> UpdaterCallback;
+
     explicit FilterEngine(JsEnginePtr jsEngine);
     JsEnginePtr GetJsEngine() const { return jsEngine; }
     bool IsFirstRun() const;
     FilterPtr GetFilter(const std::string& text);
     SubscriptionPtr GetSubscription(const std::string& url);
     std::vector<FilterPtr> GetListedFilters() const;
     std::vector<SubscriptionPtr> GetListedSubscriptions() const;
     std::vector<SubscriptionPtr> FetchAvailableSubscriptions() const;
     FilterPtr Matches(const std::string& url,
         const std::string& contentType,
         const std::string& documentUrl) const;
     std::vector<std::string> GetElementHidingSelectors(const std::string& domain) const;
     JsValuePtr GetPref(const std::string& pref) const;
     void SetPref(const std::string& pref, JsValuePtr value);
+    void ForceUpdateCheck(UpdaterCallback callback = 0);
 
   private:
     JsEnginePtr jsEngine;
     bool initialized;
     bool firstRun;
+    int updateCheckId;
 
     void InitDone(JsValueList& params);
+    void UpdateCheckDone(const std::string& eventName, UpdaterCallback callback, JsValueList& params);
   };
 }
 
 #endif