Timestamp.h

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/*
* Copyright Onix Solutions Limited [OnixS]. All rights reserved.
*
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* and international copyright treaties.
*
* Access to and use of the software is governed by the terms of the applicable OnixS Software
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* 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.
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*/

#pragma once

#include <OnixS/EuroTLX/MarketData/GTP/TimeSpan.h>

#include <string>

namespace OnixS
{
    namespace HandlerCore { namespace Common { struct TimeHelper; }}
    
    namespace EuroTLX
    {
        namespace MarketData
        {
            namespace GTP
            {
                /// Defines all the months in the year.
                struct ONIXS_EUROTLX_GTP_API Month
                {
                    /// Defines all the months in the year.
                    enum Enum
                    {
                        Undefined,
                        January,
                        February,
                        March,
                        April,
                        May,
                        June,
                        July,
                        August,
                        September,
                        October,
                        November,
                        December
                    };
                };

                /// Year, month, day fields.
                struct ONIXS_EUROTLX_GTP_API YearMonthDay
                {
                    /// Year
                    unsigned year;

                    /// Month
                    Month::Enum month;

                    ///Day
                    unsigned day;
                };

                /// Collection of timestamp formats supported.
                struct ONIXS_EUROTLX_GTP_API TimestampFormat
                {
                    enum Enum
                    {
                        /// Indicates timestamp in "YYYYMMDD" format.
                        YYYYMMDD,

                        /// Indicates timestamp in "YYYYMMDD-HH:MM:SS" format.
                        YYYYMMDDHHMMSS,

                        /// Indicates timestamp in "YYYYMMDD-HH:MM:SS.sss" format.
                        YYYYMMDDHHMMSSMsec,

                        /// Indicates timestamp in "YYYYMMDD-HH:MM:SS.sssssssss" format.
                        YYYYMMDDHHMMSSNsec
                    };
                };

                /// Represents timestamp without time-zone information.
                class ONIXS_EUROTLX_GTP_API Timestamp
                {
                    public:
                        /// Initializes as Jan 1, 0001, 00:00:00.
                        Timestamp();

                        /// Initializes date-time from all details.
                        Timestamp (
                            unsigned int year, Month::Enum month, unsigned int day,
                            unsigned int hour = 0, unsigned int minute = 0, unsigned int second = 0,
                            unsigned int nanosecond = 0);

                        /// Year component of timestamp
                        unsigned year() const;

                        /// Month component of timestamp
                        Month::Enum month() const;

                        /// day of month component of timestamp
                        /// Valid values are 1 through 31.
                        unsigned int day() const;

                        /// Returns date part of timestamp.
                        void date (YearMonthDay&) const;

                        /// Hour component of timestamp.
                        /// Valid values are 0 through 23.
                        unsigned int hour() const;

                        /// Minute component of timestamp
                        /// Valid values are 0 through 59.
                        unsigned int minute() const;

                        /// Second component of timestamp
                        /// Valid values are 0 through 59.
                        unsigned int second() const;

                        /// Millisecond component of timestamp
                        /// Valid values are 0 through 999.
                        unsigned int millisecond() const;

                        /// Microsecond component of timestamp
                        /// Valid values are 0 through 999999.
                        unsigned int microsecond() const;

                        /// Nanosecond component of timestamp
                        /// Valid values are 0 through 999999999.
                        unsigned int nanosecond() const;

                        /// Time span since Jan 1, 0001, 00:00:00.
                        const TimeSpan& sinceEpoch() const;

                        /// Epoch
                        static Timestamp epoch();

                        /// Compares instance with another one.
                        bool operator == (const Timestamp&) const;

                        /// Compares instance with another one.
                        bool operator != (const Timestamp&) const;

                        /// Tests whether instance is less than another one.
                        bool operator < (const Timestamp&) const;

                        /// Returns timestamp text presentation in requested
                        /// format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
                        std::string
                        toString (
                            TimestampFormat::Enum =
                                TimestampFormat::YYYYMMDDHHMMSSNsec) const;

                        /// Appends timestamp text presentation in requested
                        /// format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
                        void
                        toString (
                            std::string& str,
                            TimestampFormat::Enum =
                                TimestampFormat::YYYYMMDDHHMMSSNsec) const;

                        /// Returns the current UTC time.
                        ///
                        /// @note Timestamp resolution depends on
                        /// capabilities of an operating system.
                        static Timestamp utcNow();

                        /// Returns the current local time.
                        ///
                        /// @note Timestamp resolution depends on
                        /// capabilities of an operating system.
                        static Timestamp now();

                        /// Parses timestamp from its text presentation assuming it's in
                        /// specified format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
                        static
                        Timestamp
                        parse (
                            const std::string&,
                            TimestampFormat::Enum =
                                TimestampFormat::YYYYMMDDHHMMSSNsec);

                        /// Parses timestamp from its numeric presentation
                        static
                        Timestamp
                        parse (
                            unsigned long long presentation,
                            TimestampFormat::Enum format);

                    private:
                        Timestamp (long long totalSeconds, int subseconds);

                        friend struct HandlerCore::Common::TimeHelper;
                        TimeSpan sinceEpoch_;
                };

                inline
                Timestamp::Timestamp (
                    long long totalSeconds, int subseconds)
                    : sinceEpoch_ (totalSeconds, subseconds)

                {
                }

                inline
                unsigned int
                Timestamp::millisecond() const
                {
                    return sinceEpoch_.milliseconds();
                }

                inline
                unsigned int
                Timestamp::microsecond() const
                {
                    return sinceEpoch_.microseconds();
                }

                inline
                unsigned int
                Timestamp::nanosecond() const
                {
                    return sinceEpoch_.nanoseconds();
                }

                inline
                const TimeSpan&
                Timestamp::sinceEpoch() const
                {
                    return sinceEpoch_;
                }

                inline
                std::string
                Timestamp::toString (
                    TimestampFormat::Enum format) const
                {
                    std::string str;

                    toString (str, format);

                    return str;
                }

                inline
                TimeSpan
                operator - (
                    const Timestamp& left,
                    const Timestamp& right)
                {
                    TimeSpan res (left.sinceEpoch() );
                    return res -= right.sinceEpoch();
                }

            }
        }
    }
}