source: dev/branches/egtra/ab5.0/jenga/include/common/Hashmap.h@ 820

#include <stdexcept>
#include <unordered_set>
#include <boost/range/algorithm.hpp>
#include <boost/checked_delete.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/cast.hpp>
#include <boost/serialization/serialization.hpp>
#include <boost/serialization/split_member.hpp>

#pragma once


namespace Jenga{
namespace Common{

template<class T>
class ObjectInHashmap;
template<class T>
struct ObjectInHashmapHash;
template<class T>
struct ObjectInHashmapEqualTo;

#define MAX_HASHMAP 65535
template<class T> class Hashmap : boost::noncopyable
{
    typedef std::unordered_set<ObjectInHashmap<T>*, ObjectInHashmapHash<T>, ObjectInHashmapEqualTo<T>> MapType;
    MapType map;

    struct downcast
    {
        typedef T* result_type;
        T* operator ()(ObjectInHashmap<T>* p) const
        {
            return boost::polymorphic_cast<T*>(p);
        }
    };
    struct const_downcast
    {
        typedef T const* result_type;
        T const* operator ()(ObjectInHashmap<T> const* p) const
        {
            return boost::polymorphic_cast<T const*>(p);
        }
    };

public:

    Hashmap()
    {
    }
    ~Hashmap()
    {
        Clear();
    }
    void Clear()
    {
        boost::for_each(*this, boost::checked_deleter<T const>());
        map.clear();
    }

    // 内容を破棄せずにすべて抜き取る
    void PullOutAll()
    {
        map.clear();
    }

    bool Put(T* value)
    {
        if (value == nullptr)
        {
            throw std::invalid_argument("Hashmap::Put");
        }
        return map.insert(value).second;
    }

    typedef boost::transform_iterator<downcast, typename MapType::local_iterator> local_iterator;
    typedef boost::transform_iterator<const_downcast, typename MapType::const_local_iterator> const_local_iterator;

    boost::iterator_range<local_iterator> GetHashArrayElement(std::string const& keyName)
    {
        ObjectInHashmapDummy<T> t(keyName);
        return boost::iterator_range<local_iterator>(
            local_iterator(map.begin(map.bucket(&t)), downcast()),
            local_iterator(map.end(map.bucket(&t)), downcast()));
    }

    boost::iterator_range<const_local_iterator> GetHashArrayElement(std::string const& keyName) const
    {
        ObjectInHashmapDummy<T> t(keyName);
        return boost::iterator_range<const_local_iterator>(
            const_local_iterator(map.begin(map.bucket(&t)), const_downcast()),
            const_local_iterator(map.end(map.bucket(&t)), const_downcast()));
    }

    bool IsExistDuplicationKeyName(const std::string &keyName) const
    {
        ObjectInHashmapDummy<T> t(keyName);
        return map.find(&t) != map.end();
    }

    bool IsExist( const T* value ) const
    {
        return map.find(const_cast<T*>(value)) != map.end();
    }

    const T *FindLike( const ObjectInHashmap<T>* value ) const
    {
        auto it = map.find(const_cast<ObjectInHashmap<T>*>(value));
        return it != map.end()
            ? boost::polymorphic_downcast<T const*>(*it)
            : nullptr;
    }


    /////////////////////////////////////////////////////////////////
    // イテレータ
    /////////////////////////////////////////////////////////////////
    //typedef boost::transform_iterator<downcast, typename MapType::iterator> iterator;
    typedef boost::transform_iterator<downcast, typename MapType::const_iterator> const_iterator;
    typedef const_iterator iterator;
    typedef typename MapType::size_type size_type;
    typedef typename MapType::difference_type difference_type;
    //iterator begin()
    //{
    //  return iterator(map.begin(), downcast());
    //}
    //iterator end()
    //{
    //  return iterator(map.end(), downcast());
    //}
    const_iterator begin() const
    {
        return const_iterator(map.begin(), downcast());
    }
    const_iterator end() const
    {
        return const_iterator(map.end(), downcast());
    }

    // XMLシリアライズ用
private:
    friend class boost::serialization::access;
    BOOST_SERIALIZATION_SPLIT_MEMBER();
    template<class Archive> void load(Archive& ar, const unsigned int version)
    {
        std::vector<T *> objects;
        ar & BOOST_SERIALIZATION_NVP(objects);
        Clear();
        map = boost::copy_range<MapType>(objects);
    }
    template<class Archive> void save(Archive& ar, const unsigned int version) const
    {
        std::vector<T *> objects(begin(), end());
        ar & BOOST_SERIALIZATION_NVP(objects);
    }
};

template<class T>
class ObjectInHashmap
{
protected:
    ObjectInHashmap()
    {
    }
    ~ObjectInHashmap()
    {
    }

public:
    virtual const std::string &GetKeyName() const = 0;
    virtual bool IsDuplication( const T *value ) const
    {
        return ( GetKeyName() == value->GetName() );
    }
    virtual bool IsDuplication( const std::string &keyName ) const
    {
        return ( GetKeyName() == keyName );
    }
};

template<class T>
struct ObjectInHashmapHash
{
    typedef std::size_t result_type;
    std::size_t operator ()(ObjectInHashmap<T> const* x) const
    {
        return std::hash<std::string>()(x->GetKeyName());
    }
};

// GetHashArrayElementなどで文字列から検索するために用いる。
template<class T>
class ObjectInHashmapDummy : public ObjectInHashmap<T>, boost::noncopyable
{
public:
    explicit ObjectInHashmapDummy(std::string const& s) : str(s) {}

    virtual std::string const& GetKeyName() const override
    {
        return str;
    }

    virtual bool IsDuplication(T const* value) const override
    {
        return value != nullptr
            && value->ObjectInHashmap<T>::IsDuplication(str);
    }

private:
    std::string const& str;
};

template<class T>
struct ObjectInHashmapEqualTo
{
    typedef bool result_type;
    bool operator ()(_In_ ObjectInHashmap<T> const* lhs, _In_ ObjectInHashmap<T> const* rhs) const
    {
        assert(lhs != nullptr);
        assert(rhs != nullptr);
        if (auto pl = dynamic_cast<T const*>(rhs))
        {
            return lhs->IsDuplication(pl);
        }
        else
        {
            return rhs->IsDuplication(dynamic_cast<T const*>(lhs));
        }
    }
};


}}