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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#ifdef __cplusplus
#include <string>
#include <vector>
#include "JNIHelp.h"
#include "ScopedLocalRef.h"
template <typename StringVisitor>
jobjectArray toStringArray(JNIEnv* env, size_t count, StringVisitor&& visitor) {
jclass stringClass = env->FindClass("java/lang/String");
ScopedLocalRef<jobjectArray> result(env, env->NewObjectArray(count, stringClass, NULL));
env->DeleteLocalRef(stringClass);
if (result == nullptr) {
return nullptr;
}
for (size_t i = 0; i < count; ++i) {
ScopedLocalRef<jstring> s(env, env->NewStringUTF(visitor(i)));
if (env->ExceptionCheck()) {
return nullptr;
}
env->SetObjectArrayElement(result.get(), i, s.get());
if (env->ExceptionCheck()) {
return nullptr;
}
}
return result.release();
}
inline jobjectArray toStringArray(JNIEnv* env, const std::vector<std::string>& strings) {
return toStringArray(env, strings.size(), [&strings](size_t i) { return strings[i].c_str(); });
}
inline jobjectArray toStringArray(JNIEnv* env, const char* const* strings) {
size_t count = 0;
for (; strings[count] != nullptr; ++count) {}
return toStringArray(env, count, [&strings](size_t i) { return strings[i]; });
}
template <typename Counter, typename Getter>
jobjectArray toStringArray(JNIEnv* env, Counter* counter, Getter* getter) {
return toStringArray(env, counter(), [getter](size_t i) { return getter(i); });
}
#endif // __cplusplus
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