91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
// SPDX-License-Identifier: MPL-2.0
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// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include <common.h>
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#include <jni.h>
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namespace skyline {
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/**
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* @brief The JvmManager class is used to simplify transactions with the Java component
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*/
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class JvmManager {
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public:
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JavaVM *vm{}; //!< A pointer to the Java VM
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jobject instance; //!< A reference to the activity
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jclass instanceClass; //!< The class of the activity
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/**
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* @param env A pointer to the JNI environment
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* @param instance A reference to the activity
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*/
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JvmManager(JNIEnv *env, jobject instance);
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/**
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* @brief Attach the current thread to the Java VM
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*/
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void AttachThread();
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/**
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* @brief Detach the current thread to the Java VM
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*/
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void DetachThread();
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/**
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* @brief Returns a pointer to the JNI environment for the current thread
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*/
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JNIEnv *GetEnv();
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/**
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* @brief Retrieves a specific field of the given type from the activity
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* @tparam objectType The type of the object in the field
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* @param key The name of the field in the activity class
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* @return The contents of the field as objectType
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*/
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template<typename objectType>
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inline objectType GetField(const char *key) {
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JNIEnv *env = GetEnv();
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if constexpr(std::is_same<objectType, jboolean>())
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return env->GetBooleanField(instance, env->GetFieldID(instanceClass, key, "Z"));
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else if constexpr(std::is_same<objectType, jbyte>())
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return env->GetByteField(instance, env->GetFieldID(instanceClass, key, "B"));
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else if constexpr(std::is_same<objectType, jchar>())
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return env->GetCharField(instance, env->GetFieldID(instanceClass, key, "C"));
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else if constexpr(std::is_same<objectType, jshort>())
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return env->GetShortField(instance, env->GetFieldID(instanceClass, key, "S"));
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else if constexpr(std::is_same<objectType, jint>())
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return env->GetIntField(instance, env->GetFieldID(instanceClass, key, "I"));
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else if constexpr(std::is_same<objectType, jlong>())
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return env->GetLongField(instance, env->GetFieldID(instanceClass, key, "J"));
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else if constexpr(std::is_same<objectType, jfloat>())
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return env->GetFloatField(instance, env->GetFieldID(instanceClass, key, "F"));
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else if constexpr(std::is_same<objectType, jdouble>())
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return env->GetDoubleField(instance, env->GetFieldID(instanceClass, key, "D"));
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}
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/**
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* @brief Retrieves a specific field from the activity as a jobject
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* @param key The name of the field in the activity class
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* @param signature The signature of the field
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* @return A jobject of the contents of the field
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*/
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jobject GetField(const char *key, const char *signature);
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/**
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* @brief Checks if a specific field from the activity is null or not
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* @param key The name of the field in the activity class
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* @param signature The signature of the field
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* @return If the field is null or not
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*/
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bool CheckNull(const char *key, const char *signature);
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/**
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* @brief Checks if a specific jobject is null or not
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* @param object The jobject to check
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* @return If the object is null or not
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*/
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bool CheckNull(jobject &object);
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};
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}
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