Issue 4231 - Fix unstable FilterEngineTest.testSetRemoveFilterChangeCallback

libadblockplus-android/jni/JniFileSystem.cpp

Index: libadblockplus-android/jni/JniFileSystem.cpp
diff --git a/libadblockplus-android/jni/JniFileSystem.cpp b/libadblockplus-android/jni/JniFileSystem.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c5bf6bbb147d5010c3dc0f4f44ee38e69bb5e5fc
--- /dev/null
+++ b/libadblockplus-android/jni/JniFileSystem.cpp
@@ -0,0 +1,196 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2017 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/>.
+ */
+
+#include "JniCallbacks.h"
+#include "AdblockPlus/FileSystem.h"
+#include "Utils.h"
+#include <sstream>
+
+// precached in JNI_OnLoad and released in JNI_OnUnload
+JniGlobalReference<jclass>* statResultClass;
+jmethodID existsMethod;
+jmethodID isDirectoryMethod;
+jmethodID isFileMethod;
+jmethodID getLastModifiedMethod;
+
+void JniFileSystem_OnLoad(JavaVM* vm, JNIEnv* env, void* reserved)
+{
+  statResultClass = new JniGlobalReference<jclass>(env, env->FindClass(PKG("FileSystem$StatResult")));
+  existsMethod = env->GetMethodID(statResultClass->Get(), "exists", "()Z");
+  isDirectoryMethod = env->GetMethodID(statResultClass->Get(), "isDirectory", "()Z");
+  isFileMethod = env->GetMethodID(statResultClass->Get(), "isFile", "()Z");
+  getLastModifiedMethod = env->GetMethodID(statResultClass->Get(), "getLastModified", "()J");
+}
+
+void JniFileSystem_OnUnload(JavaVM* vm, JNIEnv* env, void* reserved)
+{
+  if (statResultClass)
+  {
+    delete statResultClass;
+    statResultClass = NULL;
+  }
+}
+
+static jlong JNICALL JniCtor(JNIEnv* env, jclass clazz, jobject callbackObject)
+{
+  try
+  {
+    return JniPtrToLong(new JniFileSystemCallback(env, callbackObject));
+  }
+  CATCH_THROW_AND_RETURN(env, 0)
+}
+
+static void JNICALL JniDtor(JNIEnv* env, jclass clazz, jlong ptr)
+{
+  delete JniLongToTypePtr<JniFileSystemCallback>(ptr);
+}
+
+JniFileSystemCallback::JniFileSystemCallback(JNIEnv* env, jobject callbackObject)
+  : JniCallbackBase(env, callbackObject),
+  AdblockPlus::FileSystem()
+{
+}
+
+std::shared_ptr<std::istream> JniFileSystemCallback::Read(const std::string& path) const
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "read",
+    "(Ljava/lang/String;)Ljava/lang/String;");
+
+  JniLocalReference<jstring> jPath(*env, env->NewStringUTF(path.c_str()));
+  jstring jData = (jstring)env->CallObjectMethod(GetCallbackObject(), method, *jPath);
+  CheckAndLogJavaException(*env);
+
+  if (!jData)
+    return NULL;
+
+  std::string cData = JniJavaToStdString(*env, jData);
+  std::shared_ptr<std::istream> cSharedStream(new std::istringstream(cData));
+  return cSharedStream;
+}
+
+void JniFileSystemCallback::Write(const std::string& path, std::shared_ptr<std::istream> data)
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "write",
+    "(Ljava/lang/String;Ljava/lang/String;)V");
+
+  JniLocalReference<jstring> jPath(*env, env->NewStringUTF(path.c_str()));
+
+  // read all the data from the stream into buffer (no appropriate way to pass streams over JNI)
+  std::string cData = JniStdStreamToStdString(data.get());
+  JniLocalReference<jstring> jData(*env, env->NewStringUTF(cData.c_str()));
+
+  env->CallVoidMethod(GetCallbackObject(), method, *jPath, *jData);
+  CheckAndLogJavaException(*env);
+}
+
+void JniFileSystemCallback::Move(const std::string& fromPath, const std::string& toPath)
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "move",
+    "(Ljava/lang/String;Ljava/lang/String;)V");
+
+  JniLocalReference<jstring> jFromPath(*env, env->NewStringUTF(fromPath.c_str()));
+  JniLocalReference<jstring> jToPath(*env, env->NewStringUTF(toPath.c_str()));
+
+  env->CallVoidMethod(GetCallbackObject(), method, *jFromPath, *jToPath);
+  CheckAndLogJavaException(*env);
+}
+
+void JniFileSystemCallback::Remove(const std::string& path)
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "remove",
+    "(Ljava/lang/String;)V");
+
+  JniLocalReference<jstring> jPath(*env, env->NewStringUTF(path.c_str()));
+
+  env->CallVoidMethod(GetCallbackObject(), method, *jPath);
+  CheckAndLogJavaException(*env);
+}
+
+AdblockPlus::FileSystem::StatResult JniFileSystemCallback::Stat(const std::string& path) const
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "stat",
+    "(Ljava/lang/String;)" TYP("FileSystem$StatResult"));
+
+  JniLocalReference<jstring> jPath(*env, env->NewStringUTF(path.c_str()));
+
+  jobject jStatResult = env->CallObjectMethod(GetCallbackObject(), method, *jPath);
+  CheckAndLogJavaException(*env);
+
+  AdblockPlus::FileSystem::StatResult statResult;
+
+  statResult.exists = env->CallBooleanMethod(jStatResult, existsMethod) ? JNI_TRUE : JNI_FALSE;
+  CheckAndLogJavaException(*env);
+
+  statResult.isDirectory = env->CallBooleanMethod(jStatResult, isDirectoryMethod) ? JNI_TRUE : JNI_FALSE;
+  CheckAndLogJavaException(*env);
+
+  statResult.isFile = env->CallBooleanMethod(jStatResult, isFileMethod) ? JNI_TRUE : JNI_FALSE;
+  CheckAndLogJavaException(*env);
+
+  statResult.lastModified = env->CallLongMethod(jStatResult, getLastModifiedMethod);
+  CheckAndLogJavaException(*env);
+
+  return statResult;
+}
+
+std::string JniFileSystemCallback::Resolve(const std::string& path) const
+{
+  JNIEnvAcquire env(GetJavaVM());
+
+  jmethodID method = env->GetMethodID(
+    *JniLocalReference<jclass>(*env, env->GetObjectClass(GetCallbackObject())),
+    "resolve",
+    "(Ljava/lang/String;)Ljava/lang/String;");
+
+  JniLocalReference<jstring> jPath(*env, env->NewStringUTF(path.c_str()));
+
+  jstring jRet = (jstring)env->CallObjectMethod(GetCallbackObject(), method, *jPath);
+  CheckAndLogJavaException(*env);
+
+  return JniJavaToStdString(*env, jRet);
+}
+
+static JNINativeMethod methods[] =
+{
+  { (char*)"ctor", (char*)"(Ljava/lang/Object;)J", (void*)JniCtor },
+  { (char*)"dtor", (char*)"(J)V", (void*)JniDtor }
+};
+
+extern "C" JNIEXPORT void JNICALL Java_org_adblockplus_libadblockplus_FileSystem_registerNatives(JNIEnv *env, jclass clazz)
+{
+  env->RegisterNatives(clazz, methods, sizeof(methods) / sizeof(methods[0]));
+}