New JNI bindings

jni/JniCallbacks.h

Index: jni/JniCallbacks.h
===================================================================
new file mode 100644
--- /dev/null
+++ b/jni/JniCallbacks.h
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+/*
+ * This file is part of Adblock Plus <http://adblockplus.org/>,
+ * Copyright (C) 2006-2014 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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 JNICALLBACKS_H_
+#define JNICALLBACKS_H_
+
+#include <AdblockPlus.h>
+#include "Utils.h"
+#include "JniJsValue.h"
+
+namespace AdblockPlus
+{
+namespace Android
+{
+
+class JniCallbackBase
+{
+public:
+  JniCallbackBase(JNIEnv* env, jobject callbackObject)
+  {
+    env->GetJavaVM(&m_JavaVM);
+    m_CallbackObject.reset(new JniGlobalReference<jobject>(env, callbackObject));
+    m_ExceptionLoggerClass.reset(new JniGlobalReference<jclass>(env, env->FindClass(PKG("JniExceptionHandler"))));
+  }
+
+  virtual ~JniCallbackBase()
+  {
+  }
+
+  inline JavaVM* GetJavaVM() const
+  {
+    return m_JavaVM;
+  }
+
+  inline jobject GetCallbackObject() const
+  {
+    return m_CallbackObject->get();
+  }
+
+  void LogException(JNIEnv* env, jthrowable throwable) const
+  {
+    jmethodID logMethod = env->GetStaticMethodID(m_ExceptionLoggerClass->get(), "logException", "(Ljava/lang/Throwable;)V");
+    if (logMethod)
+    {
+      env->CallStaticVoidMethod(m_ExceptionLoggerClass->get(), logMethod, throwable);
+    }
+  }
+
+  void CheckAndLogJavaException(JNIEnv* env) const
+  {
+    if (env->ExceptionCheck())
+    {
+      jthrowable throwable = env->ExceptionOccurred();
+      env->ExceptionClear();
+      LogException(env, throwable);
+    }
+  }
+
+private:
+  JavaVM* m_JavaVM;
+  JniGlobalReference<jobject>::PTR m_CallbackObject;
+  JniGlobalReference<jclass>::PTR m_ExceptionLoggerClass;
+};
+
+class JniEventCallback: public JniCallbackBase
+{
+public:
+  JniEventCallback(JNIEnv* env, jobject callbackObject) :
+      JniCallbackBase(env, callbackObject)
+  {
+  }
+
+  virtual ~JniEventCallback()
+  {
+  }
+
+  void Callback(AdblockPlus::JsValueList& params)
+  {
+    AdblockPlus::Android::JNIEnvAcquire env(GetJavaVM());
+
+    jclass clazz = env->GetObjectClass(GetCallbackObject());
+    jmethodID method = env->GetMethodID(clazz, "eventCallback", "(Ljava/util/List;)V");
+
+    if (method)
+    {
+      jobject jsList = AdblockPlus::Android::JniJsValueList2ArrayList(*env, params);
+      env->CallVoidMethod(GetCallbackObject(), method, jsList);
+
+    }
+  }
+};
+
+class JniUpdaterCallback: public JniCallbackBase
+{
+public:
+  JniUpdaterCallback(JNIEnv* env, jobject callbackObject) :
+      JniCallbackBase(env, callbackObject)
+  {
+  }
+
+  virtual ~JniUpdaterCallback()
+  {
+  }
+
+  void Callback(const std::string& arg)
+  {
+    AdblockPlus::Android::JNIEnvAcquire env(GetJavaVM());
+
+    jclass clazz = env->GetObjectClass(GetCallbackObject());
+    jmethodID method = env->GetMethodID(clazz, "updateCallback", "(Ljava/lang/String;)V");
+
+    if (method)
+    {
+      jstring jArg = env->NewStringUTF(arg.c_str());
+      env->CallVoidMethod(GetCallbackObject(), method, jArg);
+    }
+
+    CheckAndLogJavaException(*env);
+  }
+};
+
+class JniFilterChangeCallback: public JniCallbackBase
+{
+public:
+  JniFilterChangeCallback(JNIEnv* env, jobject callbackObject) :
+      JniCallbackBase(env, callbackObject)
+  {
+  }
+
+  virtual ~JniFilterChangeCallback()
+  {
+  }
+
+  void Callback(const std::string& arg, const AdblockPlus::JsValuePtr jsValue)
+  {
+    AdblockPlus::Android::JNIEnvAcquire env(GetJavaVM());
+
+    jclass clazz = env->GetObjectClass(GetCallbackObject());
+    jmethodID method = env->GetMethodID(clazz, "filterChangeCallback", "(Ljava/lang/String;" TYP("JsValue") ")V");
+
+    if (method)
+    {
+      jstring jArg = env->NewStringUTF(arg.c_str());
+      jobject jJsValue = AdblockPlus::Android::NewJniJsValue(*env, jsValue);
+      env->CallVoidMethod(GetCallbackObject(), method, jArg, jJsValue);
+    }
+
+    CheckAndLogJavaException(*env);
+  }
+};
+
+class JniLogSystemCallback: public JniCallbackBase, public AdblockPlus::LogSystem
+{
+public:
+  JniLogSystemCallback(JNIEnv* env, jobject callbackObject) :
+      JniCallbackBase(env, callbackObject), AdblockPlus::LogSystem()
+  {
+    m_LogLevelClass.reset(new JniGlobalReference<jclass>(env, env->FindClass(PKG("LogSystem$LogLevel"))));
+  }
+
+  virtual ~JniLogSystemCallback()
+  {
+  }
+
+  void operator()(AdblockPlus::LogSystem::LogLevel logLevel, const std::string& message, const std::string& source)
+  {
+    AdblockPlus::Android::JNIEnvAcquire env(GetJavaVM());
+
+    jclass clazz = env->GetObjectClass(GetCallbackObject());
+    jmethodID method = env->GetMethodID(clazz, "logCallback", "(" TYP("LogSystem$LogLevel") "Ljava/lang/String;Ljava/lang/String;)V");
+
+    // TODO: Set log level from Java and handle it here (to reduce C++->Java calls)
+
+    if (method)
+    {
+      const char* enumName = 0;
+
+      switch (logLevel)
+      {
+      default:
+      case AdblockPlus::LogSystem::LOG_LEVEL_TRACE:
+        enumName = "TRACE";
+        break;
+      case AdblockPlus::LogSystem::LOG_LEVEL_LOG:
+        enumName = "LOG";
+        break;
+      case AdblockPlus::LogSystem::LOG_LEVEL_INFO:
+        enumName = "INFO";
+        break;
+      case AdblockPlus::LogSystem::LOG_LEVEL_WARN:
+        enumName = "WARN";
+        break;
+      case AdblockPlus::LogSystem::LOG_LEVEL_ERROR:
+        enumName = "ERROR";
+        break;
+      }
+
+      jclass enumClass = m_LogLevelClass->get();
+      if (enumClass)
+      {
+        jfieldID enumField = env->GetStaticFieldID(enumClass, enumName, TYP("LogSystem$LogLevel"));
+        jobject jLogLevel = env->GetStaticObjectField(enumClass, enumField);
+
+        jstring jMessage = env->NewStringUTF(message.c_str());
+        jstring jSource = env->NewStringUTF(source.c_str());
+
+        env->CallVoidMethod(GetCallbackObject(), method, jLogLevel, jMessage, jSource);
+      }
+
+      CheckAndLogJavaException(*env);
+    }
+  }
+private:
+  JniGlobalReference<jclass>::PTR m_LogLevelClass;
+};
+
+class JniWebRequest: public JniCallbackBase, public AdblockPlus::WebRequest
+{
+public:
+  JniWebRequest(JNIEnv* env, jobject callbackObject) :
+      JniCallbackBase(env, callbackObject), AdblockPlus::WebRequest()
+  {
+    m_TupleClass.reset(new JniGlobalReference<jclass>(env, env->FindClass("com/github/rjeschke/neetutils/collections/Tuple")));
+    m_ServerResponseClass.reset(new JniGlobalReference<jclass>(env, env->FindClass(PKG("ServerResponse"))));
+  }
+
+  virtual ~JniWebRequest()
+  {
+  }
+
+  AdblockPlus::ServerResponse GET(const std::string& url, const AdblockPlus::HeaderList& requestHeaders) const
+  {
+    AdblockPlus::Android::JNIEnvAcquire env(GetJavaVM());
+
+    jclass clazz = env->GetObjectClass(GetCallbackObject());
+    jmethodID method = env->GetMethodID(clazz, "httpGET", "(Ljava/lang/String;Ljava/util/List;)" TYP("ServerResponse"));
+
+    AdblockPlus::ServerResponse sResponse;
+    sResponse.status = AdblockPlus::WebRequest::NS_ERROR_FAILURE;
+
+    if (method)
+    {
+      jobject arrayList = NewJniArrayList(*env);
+
+      for (AdblockPlus::HeaderList::const_iterator it = requestHeaders.begin(), end = requestHeaders.end(); it != end; it++)
+      {
+        JniAddObjectToList(*env, arrayList, NewTuple(*env, it->first, it->second));
+      }
+
+      jobject response = env->CallObjectMethod(GetCallbackObject(), method, env->NewStringUTF(url.c_str()), arrayList);
+
+      if (!env->ExceptionCheck())
+      {
+        sResponse.status = AdblockPlus::Android::JniGetLongField(*env, m_ServerResponseClass->get(), response, "status");
+        sResponse.responseStatus = AdblockPlus::Android::JniGetIntField(*env, m_ServerResponseClass->get(), response, "responseStatus");
+        sResponse.responseText = AdblockPlus::Android::JniGetStringField(*env, m_ServerResponseClass->get(), response, "response");
+        // TODO: transform Headers
+      }
+    }
+
+    CheckAndLogJavaException(*env);
+
+    return sResponse;
+  }
+private:
+
+  jobject NewTuple(JNIEnv* env, const std::string& a, const std::string& b) const
+  {
+    jmethodID factory = env->GetMethodID(m_TupleClass->get(), "<init>", "(Ljava/lang/Object;Ljava/lang/Object;)V");
+    return env->NewObject(m_TupleClass->get(), factory, env->NewStringUTF(a.c_str()), env->NewStringUTF(b.c_str()));
+  }
+
+  JniGlobalReference<jclass>::PTR m_TupleClass;
+  JniGlobalReference<jclass>::PTR m_ServerResponseClass;
+
+};
+
+} // namespace Android
+} // namespace AdblockPlus
+
+#endif /* JNICALLBACKS_H_ */