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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/jni_zero/jni_zero.h"
#ifdef JNI_ZERO_ENABLE_TYPE_CONVERSIONS
#include <memory>
#include "third_party/jni_zero/default_conversions.h"
namespace jni_zero {
#define PRIMITIVE_ARRAY_CONVERSIONS(T, JTYPE, J) \
template <> \
std::vector<T> FromJniArray<std::vector<T>>( \
JNIEnv * env, const JavaRef<jobject>& j_object) { \
JTYPE##Array j_array = static_cast<JTYPE##Array>(j_object.obj()); \
jsize array_jsize = env->GetArrayLength(j_array); \
size_t array_size = static_cast<size_t>(array_jsize); \
std::vector<T> ret; \
ret.resize(array_size); \
env->Get##J##ArrayRegion(j_array, 0, array_jsize, \
reinterpret_cast<JTYPE*>(ret.data())); \
return ret; \
} \
template <> \
ScopedJavaLocalRef<jarray> ToJniArray<std::vector<T>>( \
JNIEnv * env, const std::vector<T>& vec) { \
jsize array_jsize = static_cast<jsize>(vec.size()); \
JTYPE##Array arr = env->New##J##Array(array_jsize); \
CheckException(env); \
env->Set##J##ArrayRegion(arr, 0, array_jsize, \
reinterpret_cast<const JTYPE*>(vec.data())); \
return ScopedJavaLocalRef<jarray>(env, arr); \
}
PRIMITIVE_ARRAY_CONVERSIONS(int64_t, jlong, Long)
PRIMITIVE_ARRAY_CONVERSIONS(int32_t, jint, Int)
PRIMITIVE_ARRAY_CONVERSIONS(int16_t, jshort, Short)
PRIMITIVE_ARRAY_CONVERSIONS(uint16_t, jchar, Char)
PRIMITIVE_ARRAY_CONVERSIONS(uint8_t, jbyte, Byte)
PRIMITIVE_ARRAY_CONVERSIONS(float, jfloat, Float)
PRIMITIVE_ARRAY_CONVERSIONS(double, jdouble, Double)
// Specialization for bool, because vector<bool> is a bitmask under-the-hood,
// not an actual vector of bool values, and thus can't be directly copied.
template <>
std::vector<bool> FromJniArray<std::vector<bool>>(
JNIEnv* env,
const JavaRef<jobject>& j_object) {
jbooleanArray j_array = static_cast<jbooleanArray>(j_object.obj());
jsize array_jsize = env->GetArrayLength(j_array);
size_t array_size = static_cast<size_t>(array_jsize);
auto arr = std::make_unique<jboolean[]>(array_size);
env->GetBooleanArrayRegion(j_array, 0, array_jsize, arr.get());
std::vector<bool> ret;
ret.resize(array_size);
for (size_t i = 0; i < array_size; ++i) {
ret[i] = arr[i];
}
return ret;
}
template <>
ScopedJavaLocalRef<jarray> ToJniArray<std::vector<bool>>(
JNIEnv* env,
const std::vector<bool>& vec) {
jsize array_jsize = static_cast<jsize>(vec.size());
size_t array_size = static_cast<size_t>(array_jsize);
auto arr = std::make_unique<jboolean[]>(array_size);
for (size_t i = 0; i < array_size; ++i) {
arr[i] = vec[i];
}
jbooleanArray j_array = env->NewBooleanArray(array_jsize);
CheckException(env);
env->SetBooleanArrayRegion(j_array, 0, array_jsize, arr.get());
return ScopedJavaLocalRef<jarray>(env, j_array);
}
} // namespace jni_zero
#endif // JNI_ZERO_ENABLE_TYPE_CONVERSIONS
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