core_jni_helpers.h revision 987f79f60bb1f0a4bcd3ef22e57301c743f0b94f 
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 "JNIHelp.h"
21#include <android_runtime/AndroidRuntime.h>
22
23namespace android {
24
25// Defines some helpful functions.
26
27static 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
33static 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
40static 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
47static 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
54static 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
61template <typename T>
62static 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
68static 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