Issue 4948 - add possibility to not send data depending on connection properties

libadblockplus-android/jni/JniFilterEngine.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
   JniLocalReference<jclass> contentTypeClass(env,
       env->GetObjectClass(jContentType));
   jmethodID nameMethod = env->GetMethodID(*contentTypeClass, "name",
       "()Ljava/lang/String;");
   JniLocalReference<jstring> jValue(env,
       (jstring) env->CallObjectMethod(jContentType, nameMethod));
   const std::string value = JniJavaToStdString(env, *jValue);
   return AdblockPlus::FilterEngine::StringToContentType(value);
 }
 
-static jlong JNICALL JniCtor(JNIEnv* env, jclass clazz, jlong enginePtr)
+static jlong JNICALL JniCtor(JNIEnv* env, jclass clazz, jlong jsEnginePtr, jlong isAllowedConnectionCallbackPtr)
 {
   try
   {
-    AdblockPlus::JsEnginePtr& jsEngine = *JniLongToTypePtr<AdblockPlus::JsEnginePtr>(enginePtr);
-    return JniPtrToLong(new AdblockPlus::FilterEngine(jsEngine));
+    AdblockPlus::JsEnginePtr& jsEngine = *JniLongToTypePtr<AdblockPlus::JsEnginePtr>(jsEnginePtr);
+    AdblockPlus::FilterEnginePtr* filterEngine = NULL;
+
+    if (isAllowedConnectionCallbackPtr != 0)
+    {
+      AdblockPlus::FilterEngine::CreationParameters creationParameters;
+      JniIsAllowedConnectionTypeCallback* callback =
+        JniLongToTypePtr<JniIsAllowedConnectionTypeCallback>(isAllowedConnectionCallbackPtr);
+
+      AdblockPlus::FilterEngine::IsConnectionAllowedCallback cppCallback =
+        std::bind(&JniIsAllowedConnectionTypeCallback::Callback, callback, std::placeholders::_1);
+      creationParameters.isConnectionAllowedCallback = cppCallback;
+
+      filterEngine = new AdblockPlus::FilterEnginePtr(
+        AdblockPlus::FilterEngine::Create(jsEngine, creationParameters));
+    }
+    else
+    {
+      filterEngine = new AdblockPlus::FilterEnginePtr(
+        AdblockPlus::FilterEngine::Create(jsEngine));
+    }
+
+    return JniPtrToLong(filterEngine);
   }
   CATCH_THROW_AND_RETURN(env, 0)
 }
 
 static void JNICALL JniDtor(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  delete JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  delete JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 }
 
 static jboolean JNICALL JniIsFirstRun(JNIEnv* env, jclass clazz, jlong ptr)
 {
   try
   {
-    AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+    AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
     return engine->IsFirstRun() ? JNI_TRUE : JNI_FALSE;
   }
   CATCH_THROW_AND_RETURN(env, JNI_FALSE);
 }
 
 static jobject JNICALL JniGetFilter(JNIEnv* env, jclass clazz, jlong ptr, jstring jText)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   std::string text = JniJavaToStdString(env, jText);
 
   try
   {
     AdblockPlus::FilterPtr filter = engine->GetFilter(text);
 
     return NewJniFilter(env, filter);
   }
   CATCH_THROW_AND_RETURN(env, 0);
 }
 
 static jobject JNICALL JniGetListedFilters(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   try
   {
     std::vector<AdblockPlus::FilterPtr> filters = engine->GetListedFilters();
 
     jobject list = NewJniArrayList(env);
 
     for (std::vector<AdblockPlus::FilterPtr>::iterator it = filters.begin(), end = filters.end(); it != end; it++)
     {
       JniAddObjectToList(env, list, *JniLocalReference<jobject>(env, NewJniFilter(env, *it)));
     }
 
     return list;
   }
   CATCH_THROW_AND_RETURN(env, 0);
 }
 
 static jobject JNICALL JniGetSubscription(JNIEnv* env, jclass clazz, jlong ptr, jstring jUrl)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   std::string url = JniJavaToStdString(env, jUrl);
 
   try
   {
     AdblockPlus::SubscriptionPtr subscription = engine->GetSubscription(url);
 
     return NewJniSubscription(env, subscription);
   }
   CATCH_THROW_AND_RETURN(env, 0);
 }
 
 static void JNICALL JniShowNextNotification(JNIEnv* env, jclass clazz, jlong ptr, jstring jUrl)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   std::string url = JniJavaToStdString(env, jUrl);
 
   try
   {
     engine->ShowNextNotification(url);
   }
   CATCH_AND_THROW(env);
 }
 
 static void JNICALL JniSetShowNotificationCallback(JNIEnv* env, jclass clazz,
                                                   jlong ptr, jlong callbackPtr)
 {
-  AdblockPlus::FilterEngine* const engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   JniShowNotificationCallback* const callback =
       JniLongToTypePtr<JniShowNotificationCallback>(callbackPtr);
   AdblockPlus::FilterEngine::ShowNotificationCallback showNotificationCallback =
       std::bind(&JniShowNotificationCallback::Callback, callback,
                      std::placeholders::_1);
   try
   {
     engine->SetShowNotificationCallback(showNotificationCallback);
   }
   CATCH_AND_THROW(env)
 }
 
 static void JNICALL JniRemoveShowNotificationCallback(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   try
   {
     engine->RemoveShowNotificationCallback();
   }
   CATCH_AND_THROW(env);
 }
 
 static jobject JNICALL JniGetListedSubscriptions(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   try
   {
     std::vector<AdblockPlus::SubscriptionPtr> subscriptions = engine->GetListedSubscriptions();
 
     return SubscriptionsToArrayList(env, subscriptions);
   }
   CATCH_THROW_AND_RETURN(env, 0);
 }
 
 static jobject JNICALL JniFetchAvailableSubscriptions(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   try
   {
     std::vector<AdblockPlus::SubscriptionPtr> subscriptions = engine->FetchAvailableSubscriptions();
 
     return SubscriptionsToArrayList(env, subscriptions);
   }
   CATCH_THROW_AND_RETURN(env, 0);
 }
 
 static void JNICALL JniRemoveUpdateAvailableCallback(JNIEnv* env, jclass clazz,
                                                      jlong ptr)
 {
-  AdblockPlus::FilterEngine* const engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   try
   {
     engine->RemoveUpdateAvailableCallback();
   }
   CATCH_AND_THROW(env)
 }
 
 static void JNICALL JniSetUpdateAvailableCallback(JNIEnv* env, jclass clazz,
                                                   jlong ptr, jlong callbackPtr)
 {
-  AdblockPlus::FilterEngine* const engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   JniUpdateAvailableCallback* const callback =
       JniLongToTypePtr<JniUpdateAvailableCallback>(callbackPtr);
   AdblockPlus::FilterEngine::UpdateAvailableCallback updateAvailableCallback =
       std::bind(&JniUpdateAvailableCallback::Callback, callback,
                      std::placeholders::_1);
   try
   {
     engine->SetUpdateAvailableCallback(updateAvailableCallback);
   }
   CATCH_AND_THROW(env)
 }
 
 static void JNICALL JniRemoveFilterChangeCallback(JNIEnv* env, jclass clazz, jlong ptr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   try
   {
     engine->RemoveFilterChangeCallback();
   }
   CATCH_AND_THROW(env)
 }
 
 static void JNICALL JniSetFilterChangeCallback(JNIEnv* env, jclass clazz,
     jlong ptr, jlong filterPtr)
 {
-  AdblockPlus::FilterEngine* engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   JniFilterChangeCallback* callback = JniLongToTypePtr<JniFilterChangeCallback>(
       filterPtr);
 
   AdblockPlus::FilterEngine::FilterChangeCallback filterCallback =
       std::bind(&JniFilterChangeCallback::Callback, callback,
           std::placeholders::_1, std::placeholders::_2);
 
   try
   {
     engine->SetFilterChangeCallback(filterCallback);
   }
   CATCH_AND_THROW(env)
 }
 
 static void JNICALL JniForceUpdateCheck(JNIEnv* env, jclass clazz, jlong ptr, jlong updaterPtr)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
   JniUpdateCheckDoneCallback* callback =
       JniLongToTypePtr<JniUpdateCheckDoneCallback>(updaterPtr);
 
   AdblockPlus::FilterEngine::UpdateCheckDoneCallback
       updateCheckDoneCallback = 0;
 
   if (updaterPtr)
   {
     updateCheckDoneCallback =
         std::bind(&JniUpdateCheckDoneCallback::Callback, callback,
                        std::placeholders::_1);
   }
 
   try
   {
     engine->ForceUpdateCheck(updateCheckDoneCallback);
   }
   CATCH_AND_THROW(env)
 }
 
 static jobject JNICALL JniGetElementHidingSelectors(JNIEnv* env, jclass clazz,
     jlong ptr, jstring jDomain)
 {
-  AdblockPlus::FilterEngine* engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string domain = JniJavaToStdString(env, jDomain);
 
   try
   {
     std::vector<std::string> selectors = engine->GetElementHidingSelectors(
         domain);
 
     jobject list = NewJniArrayList(env);
 
     for (std::vector<std::string>::iterator it = selectors.begin(), end =
         selectors.end(); it != end; it++)
     {
       JniAddObjectToList(env, list,
           *JniLocalReference<jstring>(env, env->NewStringUTF(it->c_str())));
     }
 
     return list;
   }
   CATCH_THROW_AND_RETURN(env, 0)
 }
 
 static jobject JNICALL JniMatches(JNIEnv* env, jclass clazz, jlong ptr, jstring jUrl, jobject jContentType, jstring jDocumentUrl)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string url = JniJavaToStdString(env, jUrl);
   AdblockPlus::FilterEngine::ContentType contentType =
       ConvertContentType(env, jContentType);
   std::string documentUrl = JniJavaToStdString(env, jDocumentUrl);
 
   try
   {
     AdblockPlus::FilterPtr filter = engine->Matches(url, contentType, documentUrl);
 
@@ skipping 16 matching lines @@
               *JniLocalReference<jstring>(env,
                   static_cast<jstring>(
                       env->GetObjectArrayElement(jArray, i)))));
     }
   }
 }
 
 static jobject JNICALL JniMatchesMany(JNIEnv* env, jclass clazz, jlong ptr,
     jstring jUrl, jobject jContentType, jobjectArray jDocumentUrls)
 {
-  AdblockPlus::FilterEngine* engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string url = JniJavaToStdString(env, jUrl);
   AdblockPlus::FilterEngine::ContentType contentType =
       ConvertContentType(env, jContentType);
 
   std::vector<std::string> documentUrls;
   JavaStringArrayToStringVector(env, jDocumentUrls, documentUrls);
 
   try
   {
     AdblockPlus::FilterPtr filter = engine->Matches(url, contentType,
         documentUrls);
 
     return NewJniFilter(env, filter);
   }
   CATCH_THROW_AND_RETURN(env, 0)
 }
 
 static jboolean JNICALL JniIsDocumentWhitelisted(JNIEnv* env, jclass clazz, jlong ptr,
     jstring jUrl, jobjectArray jDocumentUrls)
 {
-  AdblockPlus::FilterEngine* engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string url = JniJavaToStdString(env, jUrl);
   std::vector<std::string> documentUrls;
   JavaStringArrayToStringVector(env, jDocumentUrls, documentUrls);
   try
   {
     return engine->IsDocumentWhitelisted(url, documentUrls) ?
         JNI_TRUE : JNI_FALSE;
   }
   CATCH_THROW_AND_RETURN(env, JNI_FALSE)
 }
 
 static jboolean JNICALL JniIsElemhideWhitelisted(JNIEnv* env, jclass clazz, jlong ptr,
     jstring jUrl, jobjectArray jDocumentUrls)
 {
-  AdblockPlus::FilterEngine* engine =
-      JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine =
+      *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string url = JniJavaToStdString(env, jUrl);
   std::vector<std::string> documentUrls;
   JavaStringArrayToStringVector(env, jDocumentUrls, documentUrls);
   try
   {
     return engine->IsElemhideWhitelisted(url, documentUrls) ?
         JNI_TRUE : JNI_FALSE;
   }
   CATCH_THROW_AND_RETURN(env, JNI_FALSE)
 }
 
 static jobject JNICALL JniGetPref(JNIEnv* env, jclass clazz, jlong ptr, jstring jPref)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr < AdblockPlus::FilterEngine > (ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string pref = JniJavaToStdString(env, jPref);
 
   try
   {
     AdblockPlus::JsValuePtr value = engine->GetPref(pref);
 
     return NewJniJsValue(env, value);
   }
   CATCH_THROW_AND_RETURN(env, 0)
 }
 
 static void JNICALL JniSetPref(JNIEnv* env, jclass clazz, jlong ptr, jstring jPref, jlong jsValue)
 {
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string pref = JniJavaToStdString(env, jPref);
   AdblockPlus::JsValuePtr value = JniGetJsValuePtr(jsValue);
 
   try
   {
     engine->SetPref(pref, value);
   }
   CATCH_AND_THROW(env)
 }
 
 static jstring JNICALL JniGetHostFromURL(JNIEnv* env, jclass clazz, jlong ptr, jstring jurl)
 {
   if (jurl == NULL)
   {
     return NULL;
   }
 
-  AdblockPlus::FilterEngine* engine = JniLongToTypePtr<AdblockPlus::FilterEngine>(ptr);
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
 
   std::string url = JniJavaToStdString(env, jurl);
   try
   {
     std::string host = engine->GetHostFromURL(url);
 
     return JniStdStringToJava(env, host);
   }
   CATCH_THROW_AND_RETURN(env, 0)
 }
 
+static void JNICALL JniSetAllowedConnectionType(JNIEnv* env, jclass clazz, jlong ptr, jstring jvalue)
+{
+  AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
+
+  std::string stdValue;
+  const std::string* value = (jvalue != NULL
+    ? &(stdValue = JniJavaToStdString(env, jvalue))
+    : NULL);
+
+  try
+  {
+    engine->SetAllowedConnectionType(value);
+  }
+  CATCH_AND_THROW(env)
+}
+
+static jstring JNICALL JniGetAllowedConnectionType(JNIEnv* env, jclass clazz, jlong ptr)
+{
+  try
+  {
+    AdblockPlus::FilterEnginePtr& engine = *JniLongToTypePtr<AdblockPlus::FilterEnginePtr>(ptr);
+    std::unique_ptr<std::string> value = engine->GetAllowedConnectionType();
+
+    if (value == NULL)
+    {
+      return NULL;
+    }
+
+    return JniStdStringToJava(env, *value.get());
+  }
+  CATCH_THROW_AND_RETURN(env, 0)
+}
+
 static JNINativeMethod methods[] =
 {
-  { (char*)"ctor", (char*)"(J)J", (void*)JniCtor },
+  { (char*)"ctor", (char*)"(JJ)J", (void*)JniCtor },
   { (char*)"isFirstRun", (char*)"(J)Z", (void*)JniIsFirstRun },
   { (char*)"getFilter", (char*)"(JLjava/lang/String;)" TYP("Filter"), (void*)JniGetFilter },
   { (char*)"getListedFilters", (char*)"(J)Ljava/util/List;", (void*)JniGetListedFilters },
   { (char*)"getSubscription", (char*)"(JLjava/lang/String;)" TYP("Subscription"), (void*)JniGetSubscription },
   { (char*)"showNextNotification", (char*)"(JLjava/lang/String;)V", (void*)JniShowNextNotification },
   { (char*)"setShowNotificationCallback", (char*)"(JJ)V", (void*)JniSetShowNotificationCallback },
   { (char*)"removeShowNotificationCallback", (char*)"(J)V", (void*)JniRemoveShowNotificationCallback },
   { (char*)"getListedSubscriptions", (char*)"(J)Ljava/util/List;", (void*)JniGetListedSubscriptions },
   { (char*)"fetchAvailableSubscriptions", (char*)"(J)Ljava/util/List;", (void*)JniFetchAvailableSubscriptions },
   { (char*)"setUpdateAvailableCallback", (char*)"(JJ)V", (void*)JniSetUpdateAvailableCallback },
   { (char*)"removeUpdateAvailableCallback", (char*)"(J)V", (void*)JniRemoveUpdateAvailableCallback },
   { (char*)"setFilterChangeCallback", (char*)"(JJ)V", (void*)JniSetFilterChangeCallback },
   { (char*)"removeFilterChangeCallback", (char*)"(J)V", (void*)JniRemoveFilterChangeCallback },
   { (char*)"forceUpdateCheck", (char*)"(JJ)V", (void*)JniForceUpdateCheck },
   { (char*)"getElementHidingSelectors", (char*)"(JLjava/lang/String;)Ljava/util/List;", (void*)JniGetElementHidingSelectors },
   { (char*)"matches", (char*)"(JLjava/lang/String;" TYP("FilterEngine$ContentType") "Ljava/lang/String;)" TYP("Filter"), (void*)JniMatches },
   { (char*)"matches", (char*)"(JLjava/lang/String;" TYP("FilterEngine$ContentType") "[Ljava/lang/String;)" TYP("Filter"), (void*)JniMatchesMany },
   { (char*)"isDocumentWhitelisted", (char*)"(JLjava/lang/String;[Ljava/lang/String;)Z", (void*)JniIsDocumentWhitelisted },
   { (char*)"isElemhideWhitelisted", (char*)"(JLjava/lang/String;[Ljava/lang/String;)Z", (void*)JniIsElemhideWhitelisted },
   { (char*)"getPref", (char*)"(JLjava/lang/String;)" TYP("JsValue"), (void*)JniGetPref },
   { (char*)"setPref", (char*)"(JLjava/lang/String;J)V", (void*)JniSetPref },
   { (char*)"getHostFromURL", (char*)"(JLjava/lang/String;)Ljava/lang/String;", (void*)JniGetHostFromURL },
+  { (char*)"setAllowedConnectionType", (char*)"(JLjava/lang/String;)V", (void*)JniSetAllowedConnectionType },
+  { (char*)"getAllowedConnectionType", (char*)"(J)Ljava/lang/String;", (void*)JniGetAllowedConnectionType },
   { (char*)"dtor", (char*)"(J)V", (void*)JniDtor }
 };
 
 extern "C" JNIEXPORT void JNICALL Java_org_adblockplus_libadblockplus_FilterEngine_registerNatives(JNIEnv *env, jclass clazz)
 {
   env->RegisterNatives(clazz, methods, sizeof(methods) / sizeof(methods[0]));
 }