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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.
*/
#ifndef TO_STRING_ARRAY_H_included
#define TO_STRING_ARRAY_H_included
#include "jni.h"
#include "ScopedLocalRef.h"
#include <string>
#include <vector>
jobjectArray newStringArray(JNIEnv* env, size_t count);
template <typename Counter, typename Getter>
jobjectArray toStringArray(JNIEnv* env, Counter* counter, Getter* getter) {
size_t count = (*counter)();
jobjectArray result = newStringArray(env, count);
if (result == NULL) {
return NULL;
}
for (size_t i = 0; i < count; ++i) {
ScopedLocalRef<jstring> s(env, env->NewStringUTF((*getter)(i)));
if (env->ExceptionCheck()) {
return NULL;
}
env->SetObjectArrayElement(result, i, s.get());
if (env->ExceptionCheck()) {
return NULL;
}
}
return result;
}
struct VectorCounter {
const std::vector<std::string>& strings;
VectorCounter(const std::vector<std::string>& strings) : strings(strings) {}
size_t operator()() {
return strings.size();
}
};
struct VectorGetter {
const std::vector<std::string>& strings;
VectorGetter(const std::vector<std::string>& strings) : strings(strings) {}
const char* operator()(size_t i) {
return strings[i].c_str();
}
};
inline jobjectArray toStringArray(JNIEnv* env, const std::vector<std::string>& strings) {
VectorCounter counter(strings);
VectorGetter getter(strings);
return toStringArray<VectorCounter, VectorGetter>(env, &counter, &getter);
}
JNIEXPORT jobjectArray toStringArray(JNIEnv* env, const char* const* strings);
#endif // TO_STRING_ARRAY_H_included
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