IdPropArrayHelper.hxx

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#pragma once
 
#include <sal/config.h>
 
#include <mutex>
#include <cppuhelper/propshlp.hxx>
#include <cassert>
#include <unordered_map>
 
namespace comphelper
{
 
    typedef std::unordered_map< sal_Int32, ::cppu::IPropertyArrayHelper* > OIdPropertyArrayMap;
    template <class TYPE>
    class OIdPropertyArrayUsageHelper
    {
    public:
        OIdPropertyArrayUsageHelper();
        virtual ~OIdPropertyArrayUsageHelper()
        {
            std::unique_lock aGuard(theMutex());
            assert(s_nRefCount > 0 && "OIdPropertyArrayUsageHelper::~OIdPropertyArrayUsageHelper : suspicious call : have a refcount of 0 !");
            if (!--s_nRefCount)
            {
                // delete the element
                for (auto const& elem : *s_pMap)
                    delete elem.second;
                delete s_pMap;
                s_pMap = nullptr;
            }
        }
 
        ::cppu::IPropertyArrayHelper* getArrayHelper(sal_Int32 nId);
 
    protected:
        virtual ::cppu::IPropertyArrayHelper* createArrayHelper(sal_Int32 nId) const = 0;
    private:
        static sal_Int32                        s_nRefCount;
        static OIdPropertyArrayMap*             s_pMap;
        static std::mutex& theMutex()
        {
            static std::mutex SINGLETON;
            return SINGLETON;
        }
    };
 
    template<class TYPE>
    sal_Int32                       OIdPropertyArrayUsageHelper< TYPE >::s_nRefCount    = 0;
 
    template<class TYPE>
    OIdPropertyArrayMap*            OIdPropertyArrayUsageHelper< TYPE >::s_pMap = nullptr;
 
    template <class TYPE>
    OIdPropertyArrayUsageHelper<TYPE>::OIdPropertyArrayUsageHelper()
    {
        std::unique_lock aGuard(theMutex());
        // create the map if necessary
        if (!s_pMap)
            s_pMap = new OIdPropertyArrayMap;
        ++s_nRefCount;
    }
 
    template <class TYPE>
    ::cppu::IPropertyArrayHelper* OIdPropertyArrayUsageHelper<TYPE>::getArrayHelper(sal_Int32 nId)
    {
        assert(s_nRefCount && "OIdPropertyArrayUsageHelper::getArrayHelper : suspicious call : have a refcount of 0 !");
        std::unique_lock aGuard(theMutex());
        // do we have the array already?
        auto& rEntry = (*s_pMap)[nId];
        if (!rEntry)
        {
            rEntry = createArrayHelper(nId);
            assert(rEntry && "OIdPropertyArrayUsageHelper::getArrayHelper : createArrayHelper returned nonsense !");
        }
        return (*s_pMap)[nId];
    }
}
 
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