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+/*************************************************************************/
+/* jni_singleton.h */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#ifndef JNI_SINGLETON_H
+#define JNI_SINGLETON_H
+
+#include <core/engine.h>
+#include <core/variant.h>
+#ifdef ANDROID_ENABLED
+#include <platform/android/jni_utils.h>
+#endif
+
+class JNISingleton : public Object {
+
+ GDCLASS(JNISingleton, Object);
+
+#ifdef ANDROID_ENABLED
+ struct MethodData {
+
+ jmethodID method;
+ Variant::Type ret_type;
+ Vector<Variant::Type> argtypes;
+ };
+
+ jobject instance;
+ Map<StringName, MethodData> method_map;
+#endif
+
+public:
+ virtual Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
+#ifdef ANDROID_ENABLED
+ Map<StringName, MethodData>::Element *E = method_map.find(p_method);
+
+ // Check the method we're looking for is in the JNISingleton map and that
+ // the arguments match.
+ bool call_error = !E || E->get().argtypes.size() != p_argcount;
+ if (!call_error) {
+ for (int i = 0; i < p_argcount; i++) {
+
+ if (!Variant::can_convert(p_args[i]->get_type(), E->get().argtypes[i])) {
+ call_error = true;
+ break;
+ }
+ }
+ }
+
+ if (call_error) {
+ // The method is not in this map, defaulting to the regular instance calls.
+ return Object::call(p_method, p_args, p_argcount, r_error);
+ }
+
+ ERR_FAIL_COND_V(!instance, Variant());
+
+ r_error.error = Callable::CallError::CALL_OK;
+
+ jvalue *v = nullptr;
+
+ if (p_argcount) {
+
+ v = (jvalue *)alloca(sizeof(jvalue) * p_argcount);
+ }
+
+ JNIEnv *env = ThreadAndroid::get_env();
+
+ int res = env->PushLocalFrame(16);
+
+ ERR_FAIL_COND_V(res != 0, Variant());
+
+ List<jobject> to_erase;
+ for (int i = 0; i < p_argcount; i++) {
+
+ jvalret vr = _variant_to_jvalue(env, E->get().argtypes[i], p_args[i]);
+ v[i] = vr.val;
+ if (vr.obj)
+ to_erase.push_back(vr.obj);
+ }
+
+ Variant ret;
+
+ switch (E->get().ret_type) {
+
+ case Variant::NIL: {
+
+ env->CallVoidMethodA(instance, E->get().method, v);
+ } break;
+ case Variant::BOOL: {
+
+ ret = env->CallBooleanMethodA(instance, E->get().method, v) == JNI_TRUE;
+ } break;
+ case Variant::INT: {
+
+ ret = env->CallIntMethodA(instance, E->get().method, v);
+ } break;
+ case Variant::FLOAT: {
+
+ ret = env->CallFloatMethodA(instance, E->get().method, v);
+ } break;
+ case Variant::STRING: {
+
+ jobject o = env->CallObjectMethodA(instance, E->get().method, v);
+ ret = jstring_to_string((jstring)o, env);
+ env->DeleteLocalRef(o);
+ } break;
+ case Variant::PACKED_STRING_ARRAY: {
+
+ jobjectArray arr = (jobjectArray)env->CallObjectMethodA(instance, E->get().method, v);
+
+ ret = _jobject_to_variant(env, arr);
+
+ env->DeleteLocalRef(arr);
+ } break;
+ case Variant::PACKED_INT32_ARRAY: {
+
+ jintArray arr = (jintArray)env->CallObjectMethodA(instance, E->get().method, v);
+
+ int fCount = env->GetArrayLength(arr);
+ Vector<int> sarr;
+ sarr.resize(fCount);
+
+ int *w = sarr.ptrw();
+ env->GetIntArrayRegion(arr, 0, fCount, w);
+ ret = sarr;
+ env->DeleteLocalRef(arr);
+ } break;
+ case Variant::PACKED_FLOAT32_ARRAY: {
+
+ jfloatArray arr = (jfloatArray)env->CallObjectMethodA(instance, E->get().method, v);
+
+ int fCount = env->GetArrayLength(arr);
+ Vector<float> sarr;
+ sarr.resize(fCount);
+
+ float *w = sarr.ptrw();
+ env->GetFloatArrayRegion(arr, 0, fCount, w);
+ ret = sarr;
+ env->DeleteLocalRef(arr);
+ } break;
+
+#ifndef _MSC_VER
+#warning This is missing 64 bits arrays, I have no idea how to do it in JNI
+#endif
+ case Variant::DICTIONARY: {
+
+ jobject obj = env->CallObjectMethodA(instance, E->get().method, v);
+ ret = _jobject_to_variant(env, obj);
+ env->DeleteLocalRef(obj);
+
+ } break;
+ default: {
+
+ env->PopLocalFrame(nullptr);
+ ERR_FAIL_V(Variant());
+ } break;
+ }
+
+ while (to_erase.size()) {
+ env->DeleteLocalRef(to_erase.front()->get());
+ to_erase.pop_front();
+ }
+
+ env->PopLocalFrame(nullptr);
+
+ return ret;
+#else // ANDROID_ENABLED
+
+ // Defaulting to the regular instance calls.
+ return Object::call(p_method, p_args, p_argcount, r_error);
+#endif
+ }
+
+#ifdef ANDROID_ENABLED
+ jobject get_instance() const {
+
+ return instance;
+ }
+
+ void set_instance(jobject p_instance) {
+
+ instance = p_instance;
+ }
+
+ void add_method(const StringName &p_name, jmethodID p_method, const Vector<Variant::Type> &p_args, Variant::Type p_ret_type) {
+
+ MethodData md;
+ md.method = p_method;
+ md.argtypes = p_args;
+ md.ret_type = p_ret_type;
+ method_map[p_name] = md;
+ }
+
+ void add_signal(const StringName &p_name, const Vector<Variant::Type> &p_args) {
+ if (p_args.size() == 0)
+ ADD_SIGNAL(MethodInfo(p_name));
+ else if (p_args.size() == 1)
+ ADD_SIGNAL(MethodInfo(p_name, PropertyInfo(p_args[0], "arg1")));
+ else if (p_args.size() == 2)
+ ADD_SIGNAL(MethodInfo(p_name, PropertyInfo(p_args[0], "arg1"), PropertyInfo(p_args[1], "arg2")));
+ else if (p_args.size() == 3)
+ ADD_SIGNAL(MethodInfo(p_name, PropertyInfo(p_args[0], "arg1"), PropertyInfo(p_args[1], "arg2"), PropertyInfo(p_args[2], "arg3")));
+ else if (p_args.size() == 4)
+ ADD_SIGNAL(MethodInfo(p_name, PropertyInfo(p_args[0], "arg1"), PropertyInfo(p_args[1], "arg2"), PropertyInfo(p_args[2], "arg3"), PropertyInfo(p_args[3], "arg4")));
+ else if (p_args.size() == 5)
+ ADD_SIGNAL(MethodInfo(p_name, PropertyInfo(p_args[0], "arg1"), PropertyInfo(p_args[1], "arg2"), PropertyInfo(p_args[2], "arg3"), PropertyInfo(p_args[3], "arg4"), PropertyInfo(p_args[4], "arg5")));
+ }
+
+#endif
+
+ JNISingleton() {
+#ifdef ANDROID_ENABLED
+ instance = nullptr;
+#endif
+ }
+};
+
+#endif // JNI_SINGLETON_H
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