1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef CORE_JNI_HELPERS 18 #define CORE_JNI_HELPERS 19 20 #include <nativehelper/JNIHelp.h> 21 #include <android_runtime/AndroidRuntime.h> 22 23 namespace android { 24 25 // Defines some helpful functions. 26 27 static inline jclass FindClassOrDie(JNIEnv* env, const char* class_name) { 28 jclass clazz = env->FindClass(class_name); 29 LOG_ALWAYS_FATAL_IF(clazz == NULL, "Unable to find class %s", class_name); 30 return clazz; 31 } 32 33 static inline jfieldID GetFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, 34 const char* field_signature) { 35 jfieldID res = env->GetFieldID(clazz, field_name, field_signature); 36 LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); 37 return res; 38 } 39 40 static inline jmethodID GetMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, 41 const char* method_signature) { 42 jmethodID res = env->GetMethodID(clazz, method_name, method_signature); 43 LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find method %s", method_name); 44 return res; 45 } 46 47 static inline jfieldID GetStaticFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, 48 const char* field_signature) { 49 jfieldID res = env->GetStaticFieldID(clazz, field_name, field_signature); 50 LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); 51 return res; 52 } 53 54 static inline jmethodID GetStaticMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, 55 const char* method_signature) { 56 jmethodID res = env->GetStaticMethodID(clazz, method_name, method_signature); 57 LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static method %s", method_name); 58 return res; 59 } 60 61 template <typename T> 62 static inline T MakeGlobalRefOrDie(JNIEnv* env, T in) { 63 jobject res = env->NewGlobalRef(in); 64 LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to create global reference."); 65 return static_cast<T>(res); 66 } 67 68 static inline int RegisterMethodsOrDie(JNIEnv* env, const char* className, 69 const JNINativeMethod* gMethods, int numMethods) { 70 int res = AndroidRuntime::registerNativeMethods(env, className, gMethods, numMethods); 71 LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods."); 72 return res; 73 } 74 75 } // namespace android 76 77 #endif // CORE_JNI_HELPERS 78
