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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>
     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 
     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