IResourceManager.h

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#pragma once
 
#include <string>
#include <map>
#include "vapor/VAssert.h"
#include "vapor/MyBase.h"
 
#ifdef WIN32
    #ifdef RENDER_EXPORTS
        #define IRESOURCEMANAGER_IMPLEMENT
    #endif
#else
    #define IRESOURCEMANAGER_IMPLEMENT
#endif
 
namespace VAPoR {
 
template<typename K, typename T> class RENDER_API IResourceManager : public Wasp::MyBase {
protected:
    std::map<K, T *> _map;
 
    T *GetResource(const K &key);
 
public:
    virtual ~IResourceManager();
    bool        HasResource(const K &key) const;
    bool        HasResource(const T *resource) const;
    virtual int LoadResourceByKey(const K &key) = 0;
    bool        AddResource(const K &key, T *resource);
    void        DeleteResource(const K &key);
};
 
#ifdef IRESOURCEMANAGER_IMPLEMENT
template<typename K, typename T> IResourceManager<K, T>::~IResourceManager()
{
    for (auto it = _map.begin(); it != _map.end(); ++it) delete it->second;
}
 
template<typename K, typename T> T *IResourceManager<K, T>::GetResource(const K &key)
{
    auto it = _map.find(key);
    if (it == _map.end()) {
        if (LoadResourceByKey(key) < 0) {
            SetErrMsg("Resource does not exist and unable to load by name");
            return nullptr;
        }
        it = _map.find(key);
    }
    return it->second;
}
 
template<typename K, typename T> bool IResourceManager<K, T>::HasResource(const K &key) const { return _map.find(key) != _map.end(); }
 
template<typename K, typename T> bool IResourceManager<K, T>::HasResource(const T *resource) const
{
    for (auto it = _map.begin(); it != _map.end(); ++it)
        if (it->second == resource) return true;
    return false;
}
 
template<typename K, typename T> bool IResourceManager<K, T>::AddResource(const K &key, T *resource)
{
    if (HasResource(key) || HasResource(resource)) {
        VAssert(!"Resource already exists");
        return false;
    }
    _map.insert(std::pair<K, T *>(key, resource));
    return true;
}
 
template<typename K, typename T> void IResourceManager<K, T>::DeleteResource(const K &key)
{
    VAssert(HasResource(key));
    delete _map[key];
    _map.erase(key);
}
#endif
 
}    // namespace VAPoR