Formatting.h

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/*
 * Copyright Onix Solutions Limited [OnixS]. All rights reserved.
 *
 * This software owned by Onix Solutions Limited [OnixS] and is protected by copyright law
 * and international copyright treaties.
 *
 * Access to and use of the software is governed by the terms of the applicable OnixS Software
 * Services Agreement (the Agreement) and Customer end user license agreements granting
 * a non-assignable, non-transferable and non-exclusive license to use the software
 * for it's own data processing purposes under the terms defined in the Agreement.
 *
 * Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
 * of this source code or associated reference material to any other location for further reproduction
 * or redistribution, and any amendments to this copyright notice, are expressly prohibited.
 *
 * Any reproduction or redistribution for sale or hiring of the Software not in accordance with
 * the terms of the Agreement is a violation of copyright law.
 */
#pragma once
 
#include <OnixS/ICE/BOE/ABI.h>
#include <OnixS/ICE/BOE/messaging/Integral.h>
#include <OnixS/ICE/BOE/messaging/StrRef.h>
#include <OnixS/ICE/BOE/messaging/SbeMessage.h>
 
#include <exception>
#include <string>
 
ONIXS_ICEBOE_MESSAGING_NAMESPACE_BEGIN
 
ONIXS_ICEBOE_EXPORTED
ONIXS_ICEBOE_NODISCARD
std::string format(Int32 index, StrRef input);
 
inline StrRef unwrap(SbeOptionalStr value)
{
    return value ? *value : StrRef{};
}
 
inline StrRef unwrap(StrRef value)
{
    return value;
}

template <typename Message>
ONIXS_ICEBOE_NODISCARD
std::string format(const Message message)
{
    const auto code = message.exchangeCode();
 
    if(!code)
        return {};
 
    try
    {
        return format(*code, unwrap(message.text()));
    }
    catch(const std::exception& e)
    {
        return std::string("Exception while description formatting: ") + e.what();
    }
}
 
namespace details {
    template<typename T>
    struct hasText
    {
        template<typename U> static auto test(int) -> typename std::enable_if<noexcept(std::declval<const U&>().text()), char>::type;
        template<typename U> static int test(...);
        static constexpr bool value = sizeof(test<T>(0)) == sizeof(char);
    };
 
    template<typename T>
    struct hasExchangeCode
    {
        template<typename U> static auto test(int) -> typename std::enable_if<noexcept(std::declval<const U&>().exchangeCode()), char>::type;
        template<typename U> static int test(...);
        static constexpr bool value = sizeof(test<T>(0)) == sizeof(char);
    };
 
    template <typename T>
    struct isFormattableMsgImpl
        : std::integral_constant<bool, std::is_base_of<BinaryBlockBase, T>::value && hasText<T>::value && hasExchangeCode<T>::value> {};
}
 
template <typename T> struct isFormattableMsg : public details::isFormattableMsgImpl<cleanType<T>> {};
 
template <typename Message>
ONIXS_ICEBOE_NODISCARD
std::string formatMsg(const Message message, typename std::enable_if<isFormattableMsg<Message>::value, void*>::type = nullptr)
{
    return format(message);
}
 
template <typename Message>
ONIXS_ICEBOE_NODISCARD
std::string formatMsg(const Message, typename std::enable_if<!isFormattableMsg<Message>::value, void*>::type = nullptr)
{
    return "";
}
 
ONIXS_ICEBOE_MESSAGING_NAMESPACE_END