ResourceHandler.h

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/* Copyright © 2009 James Legg.
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
*/
#ifndef RESOURCEHANDLER_H_
#define RESOURCEHANDLER_H_

#include <map>

namespace Engine
{

template<class Content, class Key, class ContentConstructionInformation>
class ResourceHandler
{
    // We only want one resource handler, so block public access to the default
    // constructor, copy constructor, and assigment operator.
    ResourceHandler();
    ResourceHandler(const ResourceHandler & source);
    ResourceHandler & operator=(const ResourceHandler & source);
public:
    static ResourceHandler<Content, Key, ContentConstructionInformation> & get_instance();
    virtual ~ResourceHandler();
    
    void check_load(const Key & key, ContentConstructionInformation construction_information);
    Content * get(const Key & key);
private:
    std::map<Key, Content *> data;
};

template<class Content, class Key, class ContentConstructionInformation>
ResourceHandler<Content, Key, ContentConstructionInformation>::ResourceHandler()
{
}

template<class Content, class Key, class ContentConstructionInformation>
ResourceHandler<Content, Key, ContentConstructionInformation>::~ResourceHandler()
{
    // delete all of the data.
    typename std::map<Key, Content *>::iterator iterator;
    for (iterator = data.begin(); iterator != data.end(); iterator++)
    {
        delete iterator->second;
    }
}

template<class Content, class Key, class ConstructionInfo>
ResourceHandler<Content, Key, ConstructionInfo> & ResourceHandler<Content, Key, ConstructionInfo>::get_instance()
{
    static ResourceHandler<Content, Key, ConstructionInfo> resource_handler;
    return resource_handler;
}

template<class Content, class Key, class ContentConstructionInformation>
void ResourceHandler<Content, Key, ContentConstructionInformation>::check_load(const Key & key,
                                                                 ContentConstructionInformation construction_information)
{
    // Does the object already exist?
    typename std::map<Key, Content *>::iterator it = data.find(key);
    if (it == data.end())
    {
        // We didn't find it. Constuct it.
        data[key] = new Content(construction_information);
    }
}

template<class Content, class Key, class ConstructionInfo>
Content * ResourceHandler<Content, Key, ConstructionInfo>::get(const Key & key)
{
    typename std::map<Key, Content *>::iterator it = data.find(key);
    if (it == data.end())
    {
        // not found
        return 0;
    }
    // found, return the pointer.
    return it->second;
}

}

#endif /*RESOURCEHANDLER_H_*/

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