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112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/*
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* CAndroidVMHelper.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "CAndroidVMHelper.h"
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#ifdef VCMI_ANDROID
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static JavaVM * vmCache = nullptr;
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/// cached java classloader so that we can find our classes from other threads
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static jobject vcmiClassLoader;
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static jmethodID vcmiFindClassMethod;
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void CAndroidVMHelper::cacheVM(JNIEnv * env)
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{
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env->GetJavaVM(&vmCache);
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}
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CAndroidVMHelper::CAndroidVMHelper()
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{
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auto res = vmCache->GetEnv((void **) &envPtr, JNI_VERSION_1_1);
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if(res == JNI_EDETACHED)
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{
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auto attachRes = vmCache->AttachCurrentThread(&envPtr, nullptr);
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if(attachRes == JNI_OK)
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{
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detachInDestructor = true; // only detach if we actually attached env
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}
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}
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else
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{
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detachInDestructor = false;
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}
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}
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CAndroidVMHelper::~CAndroidVMHelper()
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{
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if(envPtr && detachInDestructor)
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{
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vmCache->DetachCurrentThread();
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envPtr = nullptr;
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}
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}
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JNIEnv * CAndroidVMHelper::get()
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{
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return envPtr;
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}
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jclass CAndroidVMHelper::findClassloadedClass(const std::string & name)
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{
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auto env = get();
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return static_cast<jclass>(env->CallObjectMethod(vcmiClassLoader, vcmiFindClassMethod,
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env->NewStringUTF(name.c_str())));
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}
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void CAndroidVMHelper::callStaticVoidMethod(const std::string & cls, const std::string & method,
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bool classloaded)
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{
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auto env = get();
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auto javaHelper = findClass(cls, classloaded);
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auto methodId = env->GetStaticMethodID(javaHelper, method.c_str(), "()V");
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env->CallStaticVoidMethod(javaHelper, methodId);
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}
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std::string CAndroidVMHelper::callStaticStringMethod(const std::string & cls, const std::string & method,
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bool classloaded)
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{
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auto env = get();
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auto javaHelper = findClass(cls, classloaded);
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auto methodId = env->GetStaticMethodID(javaHelper, method.c_str(), "()Ljava/lang/String;");
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jstring jres = static_cast<jstring>(env->CallStaticObjectMethod(javaHelper, methodId));
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return std::string(env->GetStringUTFChars(jres, nullptr));
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}
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void CAndroidVMHelper::callCustomMethod(const std::string & cls, const std::string & method,
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const std::string & signature,
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std::function<void(JNIEnv *, jclass, jmethodID)> fun, bool classloaded)
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{
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auto env = get();
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auto javaHelper = findClass(cls, classloaded);
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auto methodId = env->GetStaticMethodID(javaHelper, method.c_str(), signature.c_str());
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fun(env, javaHelper, methodId);
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}
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jclass CAndroidVMHelper::findClass(const std::string & name, bool classloaded)
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{
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if(classloaded)
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{
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return findClassloadedClass(name);
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}
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return get()->FindClass(name.c_str());
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}
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extern "C" JNIEXPORT void JNICALL Java_eu_vcmi_vcmi_NativeMethods_initClassloader(JNIEnv * baseEnv, jclass cls)
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{
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CAndroidVMHelper::cacheVM(baseEnv);
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CAndroidVMHelper envHelper;
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auto env = envHelper.get();
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auto anyVCMIClass = env->FindClass(CAndroidVMHelper::NATIVE_METHODS_DEFAULT_CLASS);
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jclass classClass = env->GetObjectClass(anyVCMIClass);
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auto classLoaderClass = env->FindClass("java/lang/ClassLoader");
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auto getClassLoaderMethod = env->GetMethodID(classClass, "getClassLoader", "()Ljava/lang/ClassLoader;");
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vcmiClassLoader = (jclass) env->NewGlobalRef(env->CallObjectMethod(anyVCMIClass, getClassLoaderMethod));
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vcmiFindClassMethod = env->GetMethodID(classLoaderClass, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
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}
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#endif
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