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 #include <nativehelper/toStringArray.h>
18 
19 #include "JniConstants.h"
20 
21 namespace {
22 
23 struct ArrayCounter {
24     const char* const* strings;
25     explicit ArrayCounter(const char* const* strings) : strings(strings) {}
26     size_t operator()() {
27         size_t count = 0;
28         while (strings[count] != nullptr) {
29             ++count;
30         }
31         return count;
32     }
33 };
34 
35 struct ArrayGetter {
36     const char* const* strings;
37     explicit ArrayGetter(const char* const* strings) : strings(strings) {}
38     const char* operator()(size_t i) {
39         return strings[i];
40     }
41 };
42 
43 }  // namespace
44 
45 jobjectArray newStringArray(JNIEnv* env, size_t count) {
46     return env->NewObjectArray(count, JniConstants::GetStringClass(env), nullptr);
47 }
48 
49 jobjectArray toStringArray(JNIEnv* env, const char* const* strings) {
50     ArrayCounter counter(strings);
51     ArrayGetter getter(strings);
52     return toStringArray(env, &counter, &getter);
53 }
54