Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 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 | |
Steven Moreland | 2279b25 | 2017-07-19 09:50:45 -0700 | [diff] [blame] | 20 | #include <nativehelper/JNIHelp.h> |
Siarhei Vishniakou | e890f59 | 2018-10-15 18:53:06 -0700 | [diff] [blame] | 21 | #include <nativehelper/scoped_local_ref.h> |
| 22 | #include <nativehelper/scoped_utf_chars.h> |
Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 23 | #include <android_runtime/AndroidRuntime.h> |
| 24 | |
| 25 | namespace android { |
| 26 | |
| 27 | // Defines some helpful functions. |
| 28 | |
| 29 | static inline jclass FindClassOrDie(JNIEnv* env, const char* class_name) { |
| 30 | jclass clazz = env->FindClass(class_name); |
| 31 | LOG_ALWAYS_FATAL_IF(clazz == NULL, "Unable to find class %s", class_name); |
| 32 | return clazz; |
| 33 | } |
| 34 | |
| 35 | static inline jfieldID GetFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, |
| 36 | const char* field_signature) { |
| 37 | jfieldID res = env->GetFieldID(clazz, field_name, field_signature); |
| 38 | LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); |
| 39 | return res; |
| 40 | } |
| 41 | |
| 42 | static inline jmethodID GetMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, |
| 43 | const char* method_signature) { |
| 44 | jmethodID res = env->GetMethodID(clazz, method_name, method_signature); |
| 45 | LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find method %s", method_name); |
| 46 | return res; |
| 47 | } |
| 48 | |
| 49 | static inline jfieldID GetStaticFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, |
| 50 | const char* field_signature) { |
| 51 | jfieldID res = env->GetStaticFieldID(clazz, field_name, field_signature); |
| 52 | LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); |
| 53 | return res; |
| 54 | } |
| 55 | |
| 56 | static inline jmethodID GetStaticMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, |
| 57 | const char* method_signature) { |
| 58 | jmethodID res = env->GetStaticMethodID(clazz, method_name, method_signature); |
| 59 | LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static method %s", method_name); |
| 60 | return res; |
| 61 | } |
| 62 | |
| 63 | template <typename T> |
| 64 | static inline T MakeGlobalRefOrDie(JNIEnv* env, T in) { |
| 65 | jobject res = env->NewGlobalRef(in); |
| 66 | LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to create global reference."); |
| 67 | return static_cast<T>(res); |
| 68 | } |
| 69 | |
| 70 | static inline int RegisterMethodsOrDie(JNIEnv* env, const char* className, |
| 71 | const JNINativeMethod* gMethods, int numMethods) { |
| 72 | int res = AndroidRuntime::registerNativeMethods(env, className, gMethods, numMethods); |
| 73 | LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods."); |
| 74 | return res; |
| 75 | } |
| 76 | |
Siarhei Vishniakou | e890f59 | 2018-10-15 18:53:06 -0700 | [diff] [blame] | 77 | /** |
| 78 | * Read the specified field from jobject, and convert to std::string. |
| 79 | * If the field cannot be obtained, return defaultValue. |
| 80 | */ |
| 81 | static inline std::string getStringField(JNIEnv* env, jobject obj, jfieldID fieldId, |
| 82 | const char* defaultValue) { |
| 83 | ScopedLocalRef<jstring> strObj(env, jstring(env->GetObjectField(obj, fieldId))); |
| 84 | if (strObj != nullptr) { |
| 85 | ScopedUtfChars chars(env, strObj.get()); |
| 86 | return std::string(chars.c_str()); |
| 87 | } |
| 88 | return std::string(defaultValue); |
| 89 | } |
| 90 | |
Andreas Gampe | 987f79f | 2014-11-18 17:29:46 -0800 | [diff] [blame] | 91 | } // namespace android |
| 92 | |
| 93 | #endif // CORE_JNI_HELPERS |