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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <jni.h>
#include <QtCore/QJniEnvironment>
#include <QtCore/QJniObject>
#include <QtTest/QtTest>
static const char javaTestClass[] =
"org/qtproject/qt/android/testdatapackage/QtJniEnvironmentTestClass";
static const char javaTestClassNoCtor[] =
"org/qtproject/qt/android/testdatapackage/QtJniEnvironmentTestClassNoCtor";
static QString registerNativesString = QStringLiteral("Qt");
static int registerNativeInteger = 0;
class tst_QJniEnvironment : public QObject
{
Q_OBJECT
private slots:
void jniEnv();
void javaVM();
void registerNativeMethods();
void registerNativeMethodsByJclass();
void findMethod();
void findStaticMethod();
void findField();
void findStaticField();
};
void tst_QJniEnvironment::jniEnv()
{
QJniEnvironment env;
JavaVM *javaVM = env.javaVM();
QVERIFY(javaVM);
{
// JNI environment should now be attached to the current thread
JNIEnv *jni = 0;
QCOMPARE(javaVM->GetEnv((void**)&jni, JNI_VERSION_1_6), JNI_OK);
JNIEnv *e = env.jniEnv();
QVERIFY(e);
QCOMPARE(env->GetVersion(), JNI_VERSION_1_6);
// try to find an existing class
QVERIFY(env->FindClass("java/lang/Object"));
QVERIFY(!env->ExceptionCheck());
// try to find a nonexistent class
QVERIFY(!env->FindClass("this/doesnt/Exist"));
QVERIFY(env->ExceptionCheck());
env->ExceptionClear();
QVERIFY(env->FindClass("java/lang/Object"));
QVERIFY(!QJniEnvironment::checkAndClearExceptions(env.jniEnv()));
// try to find a nonexistent class
QVERIFY(!env->FindClass("this/doesnt/Exist"));
QVERIFY(QJniEnvironment::checkAndClearExceptions(env.jniEnv()));
// try to find an existing class with QJniEnvironment
QJniEnvironment env;
QVERIFY(env.findClass("java/lang/Object"));
QVERIFY(env.findClass<jstring>());
// try to find a nonexistent class
QVERIFY(!env.findClass("this/doesnt/Exist"));
// clear exception with member function
QVERIFY(!env->FindClass("this/doesnt/Exist"));
QVERIFY(env.checkAndClearExceptions());
}
// The env does not detach automatically, even if it goes out of scope. The only way it can
// be detached is if it's done explicitly, or if the thread we attached to gets killed (TLS clean-up).
JNIEnv *jni = nullptr;
QCOMPARE(javaVM->GetEnv((void**)&jni, JNI_VERSION_1_6), JNI_OK);
}
void tst_QJniEnvironment::javaVM()
{
QJniEnvironment env;
JavaVM *javaVM = env.javaVM();
QVERIFY(javaVM);
QCOMPARE(env.javaVM(), javaVM);
JavaVM *vm = 0;
QCOMPARE(env->GetJavaVM(&vm), JNI_OK);
QCOMPARE(env.javaVM(), vm);
}
static void callbackFromJava(JNIEnv *env, jobject /*thiz*/, jstring value)
{
Q_UNUSED(env)
registerNativesString = QJniObject(value).toString();
}
Q_DECLARE_JNI_NATIVE_METHOD(callbackFromJava);
static void callbackFromJavaNoCtor(JNIEnv *env, jobject /*thiz*/, jstring value)
{
Q_UNUSED(env)
registerNativesString = QJniObject(value).toString();
}
Q_DECLARE_JNI_NATIVE_METHOD(callbackFromJavaNoCtor);
void tst_QJniEnvironment::registerNativeMethods()
{
QJniObject QtString = QJniObject::fromString(registerNativesString);
QJniEnvironment env;
{
QVERIFY(env.registerNativeMethods(javaTestClass, {
Q_JNI_NATIVE_METHOD(callbackFromJava)
}));
QJniObject::callStaticMethod<void>(javaTestClass,
"appendJavaToString",
"(Ljava/lang/String;)V",
QtString.object<jstring>());
QTest::qWait(200);
QVERIFY(registerNativesString == QStringLiteral("From Java: Qt"));
}
// No default constructor in class
{
QVERIFY(env.registerNativeMethods(javaTestClassNoCtor, {
Q_JNI_NATIVE_METHOD(callbackFromJavaNoCtor)
}));
QJniObject::callStaticMethod<void>(javaTestClassNoCtor,
"appendJavaToString",
"(Ljava/lang/String;)V",
QtString.object<jstring>());
QTest::qWait(200);
QVERIFY(registerNativesString == QStringLiteral("From Java (no ctor): Qt"));
}
}
static void intCallbackFromJava(JNIEnv *env, jobject /*thiz*/, jint value)
{
Q_UNUSED(env)
registerNativeInteger = static_cast<int>(value);
}
Q_DECLARE_JNI_NATIVE_METHOD(intCallbackFromJava);
void tst_QJniEnvironment::registerNativeMethodsByJclass()
{
QJniEnvironment env;
jclass clazz = env.findClass(javaTestClass);
QVERIFY(clazz != 0);
QVERIFY(env.registerNativeMethods(clazz, {
Q_JNI_NATIVE_METHOD(intCallbackFromJava)
}));
QCOMPARE(registerNativeInteger, 0);
QJniObject parameter = QJniObject::fromString(QString("123"));
QJniObject::callStaticMethod<void>(clazz, "convertToInt", "(Ljava/lang/String;)V",
parameter.object<jstring>());
QTest::qWait(200);
QCOMPARE(registerNativeInteger, 123);
}
void tst_QJniEnvironment::findMethod()
{
QJniEnvironment env;
jclass clazz = env.findClass("java/lang/Integer");
QVERIFY(clazz != nullptr);
// existing method
jmethodID methodId = env.findMethod(clazz, "toString", "()Ljava/lang/String;");
QVERIFY(methodId != nullptr);
// existing method
methodId = env.findMethod<jstring>(clazz, "toString");
QVERIFY(methodId != nullptr);
// invalid signature
jmethodID invalid = env.findMethod(clazz, "unknown", "()I");
QVERIFY(invalid == nullptr);
// check that all exceptions are already cleared
QVERIFY(!env.checkAndClearExceptions());
}
void tst_QJniEnvironment::findStaticMethod()
{
QJniEnvironment env;
jclass clazz = env.findClass("java/lang/Integer");
QVERIFY(clazz != nullptr);
// existing method
jmethodID staticMethodId = env.findStaticMethod(clazz, "parseInt", "(Ljava/lang/String;)I");
QVERIFY(staticMethodId != nullptr);
// existing method
staticMethodId = env.findStaticMethod<jint, jstring>(clazz, "parseInt");
QVERIFY(staticMethodId != nullptr);
QJniObject parameter = QJniObject::fromString("123");
jint result = QJniObject::callStaticMethod<jint>(clazz, staticMethodId,
parameter.object<jstring>());
QCOMPARE(result, 123);
// invalid method
jmethodID invalid = env.findStaticMethod(clazz, "unknown", "()I");
QVERIFY(invalid == nullptr);
invalid = env.findStaticMethod<jint>(clazz, "unknown");
QVERIFY(invalid == nullptr);
// check that all exceptions are already cleared
QVERIFY(!env.checkAndClearExceptions());
}
void tst_QJniEnvironment::findField()
{
QJniEnvironment env;
jclass clazz = env.findClass(javaTestClass);
QVERIFY(clazz != nullptr);
// valid field
jfieldID validId = env.findField(clazz, "INT_FIELD", "I");
QVERIFY(validId != nullptr);
validId = env.findField<jint>(clazz, "INT_FIELD");
QVERIFY(validId != nullptr);
jmethodID constructorId = env.findMethod(clazz, "<init>", "()V");
QVERIFY(constructorId != nullptr);
jobject obj = env->NewObject(clazz, constructorId);
QVERIFY(!env.checkAndClearExceptions());
int value = env->GetIntField(obj, validId);
QVERIFY(!env.checkAndClearExceptions());
QVERIFY(value == 123);
// invalid signature
jfieldID invalidId = env.findField(clazz, "unknown", "I");
QVERIFY(invalidId == nullptr);
// check that all exceptions are already cleared
QVERIFY(!env.checkAndClearExceptions());
}
void tst_QJniEnvironment::findStaticField()
{
QJniEnvironment env;
jclass clazz = env.findClass(javaTestClass);
QVERIFY(clazz != nullptr);
// valid field
jfieldID validId = env.findStaticField(clazz, "S_INT_FIELD", "I");
QVERIFY(validId != nullptr);
validId = env.findStaticField<jint>(clazz, "S_INT_FIELD");
QVERIFY(validId != nullptr);
int size = env->GetStaticIntField(clazz, validId);
QVERIFY(!env.checkAndClearExceptions());
QVERIFY(size == 321);
// invalid signature
jfieldID invalidId = env.findStaticField(clazz, "unknown", "I");
QVERIFY(invalidId == nullptr);
// check that all exceptions are already cleared
QVERIFY(!env.checkAndClearExceptions());
}
QTEST_MAIN(tst_QJniEnvironment)
#include "tst_qjnienvironment.moc"
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