binary_enum.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef _IGNITE_BINARY_BINARY_ENUM
#define _IGNITE_BINARY_BINARY_ENUM
 
#include <stdint.h>
 
#include <ignite/common/common.h>
 
#include <ignite/binary/binary_type.h>
 
namespace ignite
{
    namespace binary
    {
        template<typename T>
        struct BinaryEnum { };
 
        template<typename T>
        struct BinaryEnumDefault
        {
            static int32_t GetTypeId()
            {
                std::string typeName;
                BinaryEnum<T>::GetTypeName(typeName);
 
                return GetBinaryStringHashCode(typeName.c_str());
            }
 
            static int32_t GetOrdinal(T value)
            {
                return static_cast<int32_t>(value);
            }
 
            static T FromOrdinal(int32_t ordinal)
            {
                return static_cast<T>(ordinal);
            }
        };
 
        template<typename T>
        struct BinaryEnumIntMinNull
        {
            static bool IsNull(const T& val)
            {
                return val == BinaryEnum<T>::FromOrdinal(INT32_MIN);
            }
 
            static void GetNull(T& dst)
            {
                dst = BinaryEnum<T>::FromOrdinal(INT32_MIN);
            }
        };
 
        template<typename T>
        struct BinaryEnumDefaultAll :
            BinaryEnumDefault<T>,
            BinaryEnumIntMinNull<T> { };
 
        template <typename T>
        struct BinaryEnum<T*>
        {
            typedef BinaryEnum<T> BinaryEnumDereferenced;
 
            static int32_t GetTypeId()
            {
                return BinaryEnumDereferenced::GetTypeId();
            }
 
            static void GetTypeName(std::string& dst)
            {
                BinaryEnumDereferenced::GetTypeName(dst);
            }
 
            static int32_t GetOrdinal(T* value)
            {
                return BinaryEnumDereferenced::GetOrdinal(*value);
            }
 
            static T* FromOrdinal(int32_t ordinal)
            {
                return new T(BinaryEnumDereferenced::FromOrdinal(ordinal));
            }
 
            static bool IsNull(T* const& obj)
            {
                return !obj || BinaryEnumDereferenced::IsNull(*obj);
            }
 
            static void GetNull(T*& dst)
            {
                dst = 0;
            }
        };
    }
}
 
#endif //_IGNITE_BINARY_BINARY_ENUM