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local_array_iteration_test.cc
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/*
* Copyright 2025 Google LLC
*
* 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.
*/
#include <algorithm>
#include <array>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include "implementation/jni_helper/fake_test_constants.h"
#include "jni_bind.h"
#include "jni_test.h"
namespace {
#if __clang__
using ::jni::AdoptLocal;
using ::jni::ArrayView;
using ::jni::Class;
using ::jni::Fake;
using ::jni::LocalArray;
using ::jni::LocalObject;
using ::jni::test::AsNewLocalReference;
using ::jni::test::JniTest;
using ::testing::_;
using ::testing::Return;
using ::testing::StrEq;
static constexpr Class kClass{"kClass"};
////////////////////////////////////////////////////////////////////////////////
// Rank 0.
////////////////////////////////////////////////////////////////////////////////
TEST_F(JniTest, IteratesOver1DRange) {
std::array expected{10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
EXPECT_CALL(*env_, GetArrayLength).WillOnce(Return(10));
EXPECT_CALL(*env_, GetIntArrayElements)
.WillRepeatedly(Return(expected.data()));
LocalArray<jint, 1> new_array{AdoptLocal{}, Fake<jintArray>()};
int i{0};
for (jint val : new_array.Pin()) {
EXPECT_EQ(val, expected[i]);
++i;
}
EXPECT_EQ(i, 10);
}
TEST_F(JniTest, WorksWithSTLComparison) {
std::array expected{10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
EXPECT_CALL(*env_, GetArrayLength).WillOnce(Return(10));
EXPECT_CALL(*env_, GetIntArrayElements)
.WillRepeatedly(Return(expected.data()));
LocalArray<jint, 1> new_array{AdoptLocal{}, Fake<jintArray>()};
ArrayView array_view = new_array.Pin();
EXPECT_TRUE(
std::equal(array_view.begin(), array_view.end(), expected.begin()));
}
TEST_F(JniTest, WorksWithSTLComparisonOfObjects) {
std::array expected{Fake<jobject>(1), Fake<jobject>(2), Fake<jobject>(3)};
EXPECT_CALL(*env_, GetArrayLength).WillOnce(Return(3));
EXPECT_CALL(*env_, GetObjectArrayElement)
.WillOnce(Return(Fake<jobject>(1)))
.WillOnce(Return(Fake<jobject>(2)))
.WillOnce(Return(Fake<jobject>(3)));
LocalArray<jobject, 1, kClass> new_array{Fake<jobjectArray>()};
ArrayView array_view = new_array.Pin();
EXPECT_TRUE(
std::equal(array_view.begin(), array_view.end(), expected.begin()));
}
TEST_F(JniTest, WorksWithSTLComparisonOfRichlyDecoratedObjects) {
std::array expected{LocalObject<kClass>{AdoptLocal{}, Fake<jobject>(1)},
LocalObject<kClass>{AdoptLocal{}, Fake<jobject>(2)},
LocalObject<kClass>{AdoptLocal{}, Fake<jobject>(3)}};
EXPECT_CALL(*env_, GetArrayLength).WillOnce(Return(3));
EXPECT_CALL(*env_, GetObjectArrayElement)
.WillOnce(Return(Fake<jobject>(1)))
.WillOnce(Return(Fake<jobject>(2)))
.WillOnce(Return(Fake<jobject>(3)));
LocalArray<jobject, 1, kClass> new_array{AdoptLocal{}, Fake<jobjectArray>()};
ArrayView array_view = new_array.Pin();
EXPECT_TRUE(
std::equal(array_view.begin(), array_view.end(), expected.begin()));
}
TEST_F(JniTest, 2D_Iterates) {
int a[5] = {1, 2, 3, 4, 5};
std::array expected{1, 2, 3, 4, 5};
EXPECT_CALL(*env_, FindClass(StrEq("[I")));
EXPECT_CALL(*env_, NewObjectArray(5, _, Fake<jobjectArray>()));
EXPECT_CALL(*env_, GetArrayLength)
.WillOnce(Return(5)) // outer
.WillOnce(Return(1)) // inner: 1, running sum: 1
.WillOnce(Return(2)) // inner: 1, running sum: 3
.WillOnce(Return(3)) // inner: 1, running sum: 6
.WillOnce(Return(4)) // inner: 1, running sum: 10
.WillOnce(Return(5)); // inner: 1, running sum: 15
// 5: Once per outer array element.
EXPECT_CALL(*env_, GetObjectArrayElement)
.WillOnce(Return(Fake<jintArray>(1)))
.WillOnce(Return(Fake<jintArray>(2)))
.WillOnce(Return(Fake<jintArray>(3)))
.WillOnce(Return(Fake<jintArray>(4)))
.WillOnce(Return(Fake<jintArray>(5)));
// All the returned intArrays are deleted.
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jclass>()));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(1)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(2)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(3)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(4)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(5)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>()));
EXPECT_CALL(*env_, DeleteLocalRef(AsNewLocalReference(Fake<jobjectArray>())));
// 5 (outer array length) * 2 (pins per) = 10
EXPECT_CALL(*env_, GetIntArrayElements).Times(10).WillRepeatedly(Return(a));
EXPECT_CALL(*env_, ReleaseIntArrayElements).Times(10);
LocalArray<jint, 2> new_array{5, Fake<jobjectArray>()};
int sum = 0;
for (LocalArray<jint> arr_1d : new_array.Pin()) {
// Note: Each `Pin` below triggers a separate `GetIntArrayElements`.
{
auto pinn = arr_1d.Pin();
EXPECT_TRUE(std::equal(pinn.begin(), pinn.end(), expected.begin()));
}
// Note: GetArrayLength is not called again (it's cached).
{
for (jint val : arr_1d.Pin()) {
sum += val;
}
}
}
// 1 + 3 + 6 + 10 + 15 = 35
EXPECT_EQ(sum, 35);
}
// Identical to above except with raw loops.
TEST_F(JniTest, 2D_Iterates_Raw_loops) {
int a[5] = {1, 2, 3, 4, 5};
std::array expected{1, 2, 3, 4, 5};
EXPECT_CALL(*env_, FindClass(StrEq("[I")));
EXPECT_CALL(*env_, NewObjectArray(5, _, Fake<jobjectArray>()));
EXPECT_CALL(*env_, GetArrayLength)
.WillOnce(Return(5)) // outer
.WillOnce(Return(1)) // inner: 1, running sum: 1
.WillOnce(Return(2)) // inner: 1, running sum: 3
.WillOnce(Return(3)) // inner: 1, running sum: 6
.WillOnce(Return(4)) // inner: 1, running sum: 10
.WillOnce(Return(5)); // inner: 1, running sum: 15
// 5: Once per outer array element.
EXPECT_CALL(*env_, GetObjectArrayElement)
.WillOnce(Return(Fake<jintArray>(1)))
.WillOnce(Return(Fake<jintArray>(2)))
.WillOnce(Return(Fake<jintArray>(3)))
.WillOnce(Return(Fake<jintArray>(4)))
.WillOnce(Return(Fake<jintArray>(5)));
// All the returned intArrays are deleted.
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(1)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(2)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(3)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(4)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jintArray>(5)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jclass>()));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>()));
// 5 (outer array length) * 2 (pins per) = 10
EXPECT_CALL(*env_, GetIntArrayElements).Times(10).WillRepeatedly(Return(a));
EXPECT_CALL(*env_, ReleaseIntArrayElements).Times(10);
LocalArray<jint, 2> new_array{5, Fake<jobjectArray>()};
int sum = 0;
int loop_size = new_array.Length();
for (int i = 0; i < loop_size; ++i) {
LocalArray<jint, 1> arr_1d{new_array.Get(i)};
// Note: Each `Pin` below triggers a separate `GetIntArrayElements`.
{
auto pinn = arr_1d.Pin();
EXPECT_TRUE(std::equal(pinn.begin(), pinn.end(), expected.begin()));
}
// Note: GetArrayLength is not called again (it's cached).
{
for (jint val : arr_1d.Pin()) {
sum += val;
}
}
}
// 1 + 3 + 6 + 10 + 15 = 35
EXPECT_EQ(sum, 35);
}
// Identical to above except with object loops.
TEST_F(JniTest, 2D_Iterates_Raw_loops_of_Objects) {
EXPECT_CALL(*env_, FindClass(StrEq("[LkClass;")));
EXPECT_CALL(*env_, NewObjectArray(5, _, Fake<jobjectArray>(100)));
EXPECT_CALL(*env_, GetArrayLength).WillOnce(Return(5)); // outer
EXPECT_CALL(*env_, GetObjectArrayElement)
.WillOnce(Return(Fake<jobjectArray>(1)))
.WillOnce(Return(Fake<jobjectArray>(2)))
.WillOnce(Return(Fake<jobjectArray>(3)))
.WillOnce(Return(Fake<jobjectArray>(4)))
.WillOnce(Return(Fake<jobjectArray>(5)));
// All the returned objectArrays are deleted.
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jclass>()));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>(1)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>(2)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>(3)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>(4)));
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>(5)));
// Note: This is just 0 (default), not 100. 100 is the sample (i.e. template)
// object, no arg is the default that is created.
EXPECT_CALL(*env_, DeleteLocalRef(Fake<jobjectArray>()));
EXPECT_CALL(*env_, DeleteLocalRef(AsNewLocalReference(Fake<jobjectArray>())));
LocalArray<jobject, 2, kClass> new_array{5, Fake<jobjectArray>(100)};
EXPECT_EQ(jobject{new_array}, Fake<jobjectArray>());
int i = 1;
for (LocalArray<jobject, 1, kClass> arr : new_array.Pin()) {
EXPECT_EQ(jobject(arr), Fake<jobjectArray>(i));
++i;
}
}
#endif // __clang__
} // namespace