123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/android/scoped_java_ref.h"
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#include "base/android/jni_android.h"
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#include "base/android/jni_string.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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namespace android {
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namespace {
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int g_local_refs = 0;
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int g_global_refs = 0;
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const JNINativeInterface* g_previous_functions;
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jobject NewGlobalRef(JNIEnv* env, jobject obj) {
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++g_global_refs;
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return g_previous_functions->NewGlobalRef(env, obj);
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}
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void DeleteGlobalRef(JNIEnv* env, jobject obj) {
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--g_global_refs;
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return g_previous_functions->DeleteGlobalRef(env, obj);
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}
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jobject NewLocalRef(JNIEnv* env, jobject obj) {
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++g_local_refs;
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return g_previous_functions->NewLocalRef(env, obj);
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}
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void DeleteLocalRef(JNIEnv* env, jobject obj) {
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--g_local_refs;
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return g_previous_functions->DeleteLocalRef(env, obj);
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}
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} // namespace
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class ScopedJavaRefTest : public testing::Test {
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protected:
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virtual void SetUp() {
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g_local_refs = 0;
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g_global_refs = 0;
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JNIEnv* env = AttachCurrentThread();
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g_previous_functions = env->functions;
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hooked_functions = *g_previous_functions;
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env->functions = &hooked_functions;
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// We inject our own functions in JNINativeInterface so we can keep track
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// of the reference counting ourselves.
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hooked_functions.NewGlobalRef = &NewGlobalRef;
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hooked_functions.DeleteGlobalRef = &DeleteGlobalRef;
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hooked_functions.NewLocalRef = &NewLocalRef;
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hooked_functions.DeleteLocalRef = &DeleteLocalRef;
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}
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virtual void TearDown() {
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JNIEnv* env = AttachCurrentThread();
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env->functions = g_previous_functions;
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}
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// From JellyBean release, the instance of this struct provided in JNIEnv is
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// read-only, so we deep copy it to allow individual functions to be hooked.
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JNINativeInterface hooked_functions;
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};
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// The main purpose of this is testing the various conversions compile.
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TEST_F(ScopedJavaRefTest, Conversions) {
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JNIEnv* env = AttachCurrentThread();
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ScopedJavaLocalRef<jstring> str = ConvertUTF8ToJavaString(env, "string");
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ScopedJavaGlobalRef<jstring> global(str);
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{
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ScopedJavaGlobalRef<jobject> global_obj(str);
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ScopedJavaLocalRef<jobject> local_obj(global);
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const JavaRef<jobject>& obj_ref1(str);
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const JavaRef<jobject>& obj_ref2(global);
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EXPECT_TRUE(env->IsSameObject(obj_ref1.obj(), obj_ref2.obj()));
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EXPECT_TRUE(env->IsSameObject(global_obj.obj(), obj_ref2.obj()));
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}
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global.Reset(str);
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const JavaRef<jstring>& str_ref = str;
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EXPECT_EQ("string", ConvertJavaStringToUTF8(str_ref));
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str.Reset();
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}
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TEST_F(ScopedJavaRefTest, RefCounts) {
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JNIEnv* env = AttachCurrentThread();
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ScopedJavaLocalRef<jstring> str;
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// The ConvertJavaStringToUTF8 below creates a new string that would normally
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// return a local ref. We simulate that by starting the g_local_refs count at
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// 1.
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g_local_refs = 1;
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str.Reset(ConvertUTF8ToJavaString(env, "string"));
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EXPECT_EQ(1, g_local_refs);
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EXPECT_EQ(0, g_global_refs);
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{
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ScopedJavaGlobalRef<jstring> global_str(str);
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ScopedJavaGlobalRef<jobject> global_obj(global_str);
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EXPECT_EQ(1, g_local_refs);
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EXPECT_EQ(2, g_global_refs);
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ScopedJavaLocalRef<jstring> str2(env, str.Release());
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EXPECT_EQ(1, g_local_refs);
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{
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ScopedJavaLocalRef<jstring> str3(str2);
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EXPECT_EQ(2, g_local_refs);
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}
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EXPECT_EQ(1, g_local_refs);
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str2.Reset();
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EXPECT_EQ(0, g_local_refs);
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global_str.Reset();
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EXPECT_EQ(1, g_global_refs);
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ScopedJavaGlobalRef<jobject> global_obj2(global_obj);
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EXPECT_EQ(2, g_global_refs);
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}
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EXPECT_EQ(0, g_local_refs);
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EXPECT_EQ(0, g_global_refs);
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}
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} // namespace android
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} // namespace base
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