Add a const JNINativeMethod[] overload for registerNativeMethods()

The JNI interface expects a const JNINativeMethod[] and our wrapper
takes a non-const. Also, this was causing refactoring of exisisting code
with a const JNINativeMethod[] to fail because the call expects a
non-const.

Change-Id: If790c401650cb33fe31f93bafe41aab7714488e9
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

src/corelib/doc/snippets/jni/src_qjniobject.cpp

@@ -97,7 +97,8 @@ static void fromJavaTwo(JNIEnv *env, jobject thiz, jint x)
 void foo()
 {
     // register the native methods first, ideally it better be done with the app start
-    JNINativeMethod methods[] {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
+    const JNINativeMethod methods[] =
+                {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
                  {"callNativeTwo", "(I)V", reinterpret_cast<void *>(fromJavaTwo)}};
     QJniEnvironment env;
     env.registerNativeMethods("my/java/project/FooJavaClass", methods, 2);

src/corelib/kernel/qjnienvironment.cpp

@@ -268,7 +268,7 @@ JavaVM *QJniEnvironment::javaVM()
 }
 
 /*!
-    \fn bool QJniEnvironment::registerNativeMethods(const char *className, JNINativeMethod methods[], int size)
+    \fn bool QJniEnvironment::registerNativeMethods(const char *className, const JNINativeMethod methods[], int size)
 
     Registers the Java methods in the array \a methods of size \a size, each of
     which can call native C++ functions from class \a className. These methods
@@ -284,13 +284,15 @@ JavaVM *QJniEnvironment::javaVM()
     \endlist
 
     \code
-    JNINativeMethod methods[] {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
+    const JNINativeMethod methods[] =
+                            {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
                             {"callNativeTwo", "(I)V", reinterpret_cast<void *>(fromJavaTwo)}};
     QJniEnvironment env;
     env.registerNativeMethods("org/qtproject/android/TestJavaClass", methods, 2);
     \endcode
 */
-bool QJniEnvironment::registerNativeMethods(const char *className, JNINativeMethod methods[], int size)
+bool QJniEnvironment::registerNativeMethods(const char *className, const JNINativeMethod methods[],
+                                            int size)
 {
     QJniObject classObject(className);
 
@@ -299,6 +301,37 @@ bool QJniEnvironment::registerNativeMethods(const char *className, JNINativeMeth
     return registerNativeMethods(classObject.objectClass(), methods, size);
 }
 
+/*!
+    \overload
+    \obsolete Use the overload with a const JNINativeMethod[] instead.
+
+    Registers the Java methods in the array \a methods of size \a size, each of
+    which can call native C++ functions from class \a className. These methods
+    must be registered before any attempt to call them.
+
+    Returns \c true if the registration is successful, otherwise \c false.
+
+    Each element in the methods array consists of:
+    \list
+        \li The Java method name
+        \li Method signature
+        \li The C++ functions that will be executed
+    \endlist
+
+    \code
+    JNINativeMethod methods[] = {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
+                                 {"callNativeTwo", "(I)V", reinterpret_cast<void *>(fromJavaTwo)}};
+    QJniEnvironment env;
+    env.registerNativeMethods("org/qtproject/android/TestJavaClass", methods, 2);
+    \endcode
+*/
+#if QT_DEPRECATED_SINCE(6, 2)
+bool QJniEnvironment::registerNativeMethods(const char *className, JNINativeMethod methods[],
+                                            int size)
+{
+    return registerNativeMethods(className, const_cast<const JNINativeMethod*>(methods), size);
+}
+#endif
 /*!
     \overload
 
@@ -312,7 +345,8 @@ bool QJniEnvironment::registerNativeMethods(const char *className, JNINativeMeth
     env.registerNativeMethods(clazz, methods, 2);
     \endcode
 */
-bool QJniEnvironment::registerNativeMethods(jclass clazz, JNINativeMethod methods[], int size)
+bool QJniEnvironment::registerNativeMethods(jclass clazz, const JNINativeMethod methods[],
+                                            int size)
 {
     if (d->jniEnv->RegisterNatives(clazz, methods, size) < 0) {
         checkAndClearExceptions();

src/corelib/kernel/qjnienvironment.h

@@ -62,8 +62,14 @@ public:
     jmethodID findMethod(jclass clazz, const char *methodName, const char *signature);
     jmethodID findStaticMethod(jclass clazz, const char *methodName, const char *signature);
     static JavaVM *javaVM();
+    bool registerNativeMethods(const char *className, const JNINativeMethod methods[], int size);
+    bool registerNativeMethods(jclass clazz, const JNINativeMethod methods[], int size);
+
+#if QT_DEPRECATED_SINCE(6, 2)
+    // ### Qt 7: remove
+    QT_DEPRECATED_VERSION_X_6_2("Use the overload with a const JNINativeMethod[] instead.")
     bool registerNativeMethods(const char *className, JNINativeMethod methods[], int size);
-    bool registerNativeMethods(jclass clazz, JNINativeMethod methods[], int size);
+#endif
 
     enum class OutputMode {
         Silent,

tests/auto/corelib/kernel/qjnienvironment/tst_qjnienvironment.cpp

@@ -122,7 +122,7 @@ static void callbackFromJava(JNIEnv *env, jobject /*thiz*/, jstring value)
 
 void tst_QJniEnvironment::registerNativeMethods()
 {
-    JNINativeMethod methods[] {
+    const JNINativeMethod methods[] {
         {"callbackFromJava", "(Ljava/lang/String;)V", reinterpret_cast<void *>(callbackFromJava)}
     };
 
@@ -146,7 +146,7 @@ static void intCallbackFromJava(JNIEnv *env, jobject /*thiz*/, jint value)
 
 void tst_QJniEnvironment::registerNativeMethodsByJclass()
 {
-    JNINativeMethod methods[] {
+    const JNINativeMethod methods[] {
         { "intCallbackFromJava", "(I)V", reinterpret_cast<void *>(intCallbackFromJava) }
     };