1 /*
2  * Copyright (C) 2011 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 #define LOG_TAG "ExecStrings"
18 
19 #include "ExecStrings.h"
20 
21 #include <stdlib.h>
22 
23 #include <log/log.h>
24 
25 #include <nativehelper/ScopedLocalRef.h>
26 
27 ExecStrings::ExecStrings(JNIEnv* env, jobjectArray java_string_array)
28     : env_(env), java_array_(java_string_array), array_(NULL) {
29   if (java_array_ == NULL) {
30     return;
31   }
32 
33   jsize length = env_->GetArrayLength(java_array_);
34   array_ = new char*[length + 1];
35   array_[length] = NULL;
36   for (jsize i = 0; i < length; ++i) {
37     ScopedLocalRef<jstring> java_string(env_, reinterpret_cast<jstring>(env_->GetObjectArrayElement(java_array_, i)));
38     // We need to pass these strings to const-unfriendly code.
39     char* string = const_cast<char*>(env_->GetStringUTFChars(java_string.get(), NULL));
40     array_[i] = string;
41   }
42 }
43 
44 ExecStrings::~ExecStrings() {
45   if (array_ == NULL) {
46     return;
47   }
48 
49   // Temporarily clear any pending exception so we can clean up.
50   jthrowable pending_exception = env_->ExceptionOccurred();
51   if (pending_exception != NULL) {
52     env_->ExceptionClear();
53   }
54 
55   jsize length = env_->GetArrayLength(java_array_);
56   for (jsize i = 0; i < length; ++i) {
57     ScopedLocalRef<jstring> java_string(env_, reinterpret_cast<jstring>(env_->GetObjectArrayElement(java_array_, i)));
58     env_->ReleaseStringUTFChars(java_string.get(), array_[i]);
59   }
60   delete[] array_;
61 
62   // Re-throw any pending exception.
63   if (pending_exception != NULL) {
64     if (env_->Throw(pending_exception) < 0) {
65       ALOGE("Error rethrowing exception!");
66     }
67   }
68 }
69 
70 char** ExecStrings::get() {
71   return array_;
72 }
73