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1 /*
2  * Copyright (C) 2017 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 ART_TEST_TI_AGENT_JNI_HELPER_H_
18 #define ART_TEST_TI_AGENT_JNI_HELPER_H_
19 
20 #include "jni.h"
21 #include "scoped_local_ref.h"
22 
23 namespace art {
24 
25 // Create an object array using a lambda that returns a local ref for each element.
26 template <typename T>
CreateObjectArray(JNIEnv * env,jint length,const char * component_type_descriptor,T src)27 static inline jobjectArray CreateObjectArray(JNIEnv* env,
28                                              jint length,
29                                              const char* component_type_descriptor,
30                                              T src) {
31   if (length < 0) {
32     return nullptr;
33   }
34 
35   ScopedLocalRef<jclass> obj_class(env, env->FindClass(component_type_descriptor));
36   if (obj_class.get() == nullptr) {
37     return nullptr;
38   }
39 
40   ScopedLocalRef<jobjectArray> ret(env, env->NewObjectArray(length, obj_class.get(), nullptr));
41   if (ret.get() == nullptr) {
42     return nullptr;
43   }
44 
45   for (jint i = 0; i < length; ++i) {
46     jobject element = src(i);
47     env->SetObjectArrayElement(ret.get(), static_cast<jint>(i), element);
48     env->DeleteLocalRef(element);
49     if (env->ExceptionCheck()) {
50       return nullptr;
51     }
52   }
53 
54   return ret.release();
55 }
56 
JniThrowNullPointerException(JNIEnv * env,const char * msg)57 inline bool JniThrowNullPointerException(JNIEnv* env, const char* msg) {
58   if (env->ExceptionCheck()) {
59     env->ExceptionClear();
60   }
61 
62   ScopedLocalRef<jclass> exc_class(env, env->FindClass("java/lang/NullPointerException"));
63   if (exc_class.get() == nullptr) {
64     return -1;
65   }
66 
67   return env->ThrowNew(exc_class.get(), msg) == JNI_OK;
68 }
69 
70 }  // namespace art
71 
72 #endif  // ART_TEST_TI_AGENT_JNI_HELPER_H_
73