aui::jni

Detailed Description

C++/Java bridge.

Used to make AUI work on Android.

Classes
class	aui::jni::ArrayView< T >
	Java array view. More...
class	aui::jni::GlobalRef
	Global ref. More...

Macros
#define	AUI_JNI_CLASS(path, name)
	Defines getClassName and other useful methods required for Java class definition.
#define	AUI_JNI_STATIC_METHOD(ret_t, name, args)
	Defines static method C++ -> Java.
#define	AUI_JNI_METHOD(ret_t, name, args)
	Defines nonstatic method C++ -> Java.

Macro Definition Documentation

AUI_JNI_CLASS

#define AUI_JNI_CLASS	(		path,
			name )

Value:

class name ## _info: public ::aui::jni::GlobalRef { \
public:                           \
    static constexpr auto JAVA_CLASS_NAME = #path ## _asl;                        \
    [[nodiscard]] static constexpr auto getClassName() noexcept { return #path; } \
    [[nodiscard]] static auto getClass() noexcept { static ::aui::jni::GlobalRef t = ::aui::jni::env()->FindClass(getClassName()); AUI_ASSERTX(t.asClass() != nullptr, "no such class: " #path); return t.asClass(); } \
                                      \
};                                \
struct name: public name ## _info

Defines getClassName and other useful methods required for Java class definition.

Parameters

name	name of cpp class
path	slash-style path to Java class (including name)

Usage:

namespace com::github::aui::android {
    AUI_JNI_CLASS(com/github/aui/android/Platform, AUI) {
    public:
        // class definition
        AUI_JNI_STATIC_METHOD(void, callStaticMethod, ())
        AUI_JNI_METHOD(void, CallNonStaticMethod, ())
    };
}
..
com::github::aui::android::Platform::getClassName() -> "com/github/aui/android/Platform"

AUI_JNI_METHOD

#define AUI_JNI_METHOD	(		ret_t,
			name,
			args )

Value:

    ret_t name (AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES, _, args)) { \
        static_assert(::aui::jni::convertible<ret_t>, "return type is required to be convertible"); \
        auto clazz = getClass();                 \
        auto e = ::aui::jni::env();              \
        const char* signature = ::aui::jni::signature_v<ret_t (AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES, _, args))>; \
        static auto methodId = e->GetMethodID(clazz, #name, signature);    \
        if (methodId == 0) {                          \
            throw AException("no such jni method: {} {}"_format(#name, signature)); \
        }                                         \
        return ::aui::jni::callMethod<ret_t>(this->asObject(), methodId AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES_CONTENTS, _, args)); \
    }

Defines nonstatic method C++ -> Java.

Parameters

ret_t	return type.
name	static method's name.
args	arguments wrapped with braces. Types should be also wrapped in braces (see example).

Usage:

namespace com::github::aui::android {
    AUI_JNI_CLASS(com/github/aui/android/Platform, Platform) {  // required for AUI_JNI_STATIC_METHOD
    public:
        AUI_JNI_METHOD(float, getDpiRatio, ())
        AUI_JNI_METHOD(void, openUrl, ((const AString&) url))
        AUI_JNI_METHOD(void, test, ((int) x, (int) y))
    };
}
..
com::github::aui::android::Platform::getClassName() -> "com/github/aui/android/Platform"

AUI_JNI_STATIC_METHOD

#define AUI_JNI_STATIC_METHOD	(		ret_t,
			name,
			args )

Value:

    static ret_t name (AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES, _, args)) { \
        static_assert(::aui::jni::convertible<ret_t>, "return type is required to be convertible"); \
        auto clazz = getClass();                 \
        auto e = ::aui::jni::env();              \
        const char* signature = ::aui::jni::signature_v<ret_t (AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES, _, args))>; \
        static auto methodId = e->GetStaticMethodID(clazz, #name, signature);    \
        if (methodId == 0) {                          \
            throw AException("no such static jni method: {} {}"_format(#name, signature)); \
        }                                         \
        return ::aui::jni::callStaticMethod<ret_t>(clazz, methodId AUI_PP_FOR_EACH(AUI_JNI_INTERNAL_OMIT_BRACES_CONTENTS, _, args)); \
    }

Defines static method C++ -> Java.

Parameters

ret_t	return type.
name	static method's name.
args	arguments wrapped with braces. Types should be also wrapped in braces (see example).

Usage:

namespace com::github::aui::android {
    AUI_JNI_CLASS(com/github/aui/android/Platform, Platform) {  // required for AUI_JNI_STATIC_METHOD
    public:
        AUI_JNI_STATIC_METHOD(float, getDpiRatio, ())
        AUI_JNI_STATIC_METHOD(void, openUrl, ((const AString&) url))
        AUI_JNI_STATIC_METHOD(void, test, ((int) x, (int) y))
    };
}
..
com::github::aui::android::Platform::getClassName() -> "com/github/aui/android/Platform"

Function Documentation

env()

JNIEnv * aui::jni::env

(

)

Returns

JNI Env pointer for the current thread.

javaVM()

API_AUI_CORE JavaVM * aui::jni::javaVM

(

)

Returns

Java VM pointer.