EnvironmentalVariable.h

#pragma once
#include "DLLInfo.h"
#include <NDEVR/Resource.h>
#include <NDEVR/ResourceListener.h>
#include <NDEVR/String.h>
#include <NDEVR/Dictionary.h>
#include <NDEVR/InfoPipe.h>
namespace NDEVR
{
    class StringView; 
    class InfoPipe; 
    class NDEVR_BASE_API EnvironmentalVariable final : private ResourceListener
    {
    public:
        static String GetEnvironmentalVariable(const StringView& label);
 
        
        static String ResolveEnvironmentalVariables(const StringView& string);
        static void SetUserEnvironmentalVariable(const StringView& label, const StringView& value, bool blocking = false, LogPtr log = LogPtr());
        static void SetSystemEnvironmentalVariable(const StringView& label, const StringView& value, bool blocking = false, LogPtr log = LogPtr());
        static void SetProgramEnvironmentalVariable(const StringView& label, const StringView& value);
        EnvironmentalVariable(const StringView& variable);
        ~EnvironmentalVariable();
        const String& get();
        Resource<String>& resource();
    private:
        void fetchResource();
        void onValueChanged() final override;
    private:
        Resource<String> m_resource;
        String variable;
        bool m_is_fetched = false; 
        bool m_is_fetching = false; 
    private:
        static Dictionary<String, String> s_user_environment_variables; 
        static Dictionary<String, String> s_system_environment_variables; 
        static Dictionary<String, String> s_program_environment_variables; 
    };
}