CandleSymbol.hpp

// Copyright (c) 2025 Devexperts LLC.
// SPDX-License-Identifier: MPL-2.0
 
#pragma once
 
#include "../../internal/Conf.hpp"
 
DXFCXX_DISABLE_MSC_WARNINGS_PUSH(4251)
 
#include "./CandleAlignment.hpp"
#include "./CandleExchange.hpp"
#include "./CandlePeriod.hpp"
#include "./CandlePrice.hpp"
#include "./CandlePriceLevel.hpp"
#include "./CandleSession.hpp"
 
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include <variant>
 
DXFCPP_BEGIN_NAMESPACE
 
/**
 * The common "variant" type for the candle attribute types
 */
using CandleSymbolAttributeVariant =
    std::variant<CandleExchange, CandlePrice, CandleSession, CandlePeriod, CandleAlignment, CandlePriceLevel>;
 
/**
 * Symbol that should be used with DXFeedSubscription class to subscribe for Candle events. `DXFeedSubscription` also
 * accepts a string representation of the candle symbol for subscription.
 *
 * <h3>String representation</h3>
 *
 * The string representation of the candle symbol consist of a @ref CandleSymbol::getBaseSymbol() "baseSymbol" followed
 * by an optional '&' with an @ref CandleSymbol::getExchange() "exchange" code letter and followed by an optional list
 * of comma-separated key=value pairs in curly braces:
 *
 * <p>`<baseSymbol> [ '&' <exchange> ] [ '{' <key1>=<value1> [ ',' <key2>=<value2> ] ... '}' ]`
 *
 * <p>Properties of the candle symbol correspond to the keys in the string representation in the following way:
 *
 * <ul>
 * <li>Empty key corresponds to @ref CandleSymbol::getPeriod() "period" &mdash; aggregation period of this symbol.
 *     The period value is composed of an optional @ref CandlePeriod::getValue() "value" which defaults to 1 when not
 *     specified, followed by a @ref CandlePeriod::getType() "type" string which is defined by one of the CandleType
 *     values and can be abbreviated to first letters. For example, a daily candle of "IBM" base symbol can be
 *     specified as "IBM{=d}" and 15 minute candle on it as "IBM{=15m}". The shortest possible abbreviation for
 *     CandleType::MONTH is "mo", so the monthly candle can be specified as "IBM{=mo}". When a period is not specified,
 *     then the CandlePeriod::TICK aggregation period is assumed as default. Note that tick aggregation may not be
 *     available on the demo system, which is limited to a subset of symbols and aggregation periods.
 * <li>"price" key corresponds to @ref CandleSymbol::getPrice() "price" &mdash; price type attribute of this symbol.
 *     The CandlePrice defines possible values with CandlePrice::LAST being default.
 *     For legacy backwards-compatibility purposes, most of the price values cannot be abbreviated, so a one-minute
 *     candle of "EUR/USD" bid price shall be specified with "EUR/USD{=m,price=bid}" candle symbol string. However, the
 *     CandlePrice::SETTLEMENT can be abbreviated to "s", so a daily candle on "/ES" futures settlement prices can be
 *     specified with "/ES{=d,price=s}" string.
 * <li>"tho" key with a value of "true" corresponds to @ref CandleSymbol::getSession() "session" set to
 * CandleSession::REGULAR which limits the candle to trading hours only, so a 133 tick candles on "GOOG" base symbol
 * collected over trading hours only can be specified with "GOOG{=133t,tho=true}" string. Note that the default daily
 * candles for US equities are special for historical reasons and correspond to the way US equity exchange report their
 *     daily summary data. The volume of the US equity default daily candle corresponds to the total daily traded volume,
 *     while open, high, low, and close correspond to the regular trading hours only.
 * <li>"a" key corresponds to @ref CandleSymbol::getAlignment() "alignment" &mdash; alignment attribute of this symbol.
 *     The CandleAlignment defines possible values with CandleAlignment::MIDNIGHT being default. The alignment values
 *     can be abbreviated to the first letter. So, a 1 hour candle on a symbol "AAPL" that starts at the regular
 *     trading session at 9:30 am ET can be specified with "AAPL{=h,a=s,tho=true}". Contrast that to
 *     the "AAPL{=h,tho=true}" candle that is aligned at midnight and thus starts at 9:00 am.
 * <li>"pl" key corresponds to @ref CandleSymbol::getPriceLevel() "price level" &mdash; price level attribute of this
 * symbol. The CandlePriceLevel defines additional axis to split candles within particular price corridor in addition to
 *     CandlePeriod attribute with the default value `NaN`. So a one-minute candles of "AAPL" with price level 0.1
 *     shall be specified with "AAPL{=m,pl=0.1}".
 * </ul>
 *
 * Keys in the candle symbol are case-sensitive, while values are not. The CandleSymbol::valueOf() method parses any
 * valid string representation into a candle symbol object. The result of the candle symbol CandleSymbol::toString()
 * method is always normalized: keys are ordered lexicographically, values are in lower-case and are abbreviated to
 * their shortest possible form.
 */
struct DXFCPP_EXPORT CandleSymbol {
    static const CandleSymbol NUL;
 
    private:
    std::string symbol_{};
    std::string baseSymbol_{};
    std::optional<CandleExchange> exchange_{};
    std::optional<CandlePrice> price_{};
    std::optional<CandleSession> session_{};
    std::optional<CandlePeriod> period_{};
    std::optional<CandleAlignment> alignment_{};
    std::optional<CandlePriceLevel> priceLevel_{};
 
    static std::string changeAttribute(const StringLike &symbol,
                                       const CandleSymbolAttributeVariant &attribute) noexcept;
 
    template <typename AttributeIt>
    static std::string changeAttributes(const StringLike &s, AttributeIt begin, AttributeIt end) noexcept {
        auto symbol = std::string(s);
 
        for (auto it = begin; it != end; ++it) {
            symbol = changeAttribute(symbol, *it);
        }
 
        return symbol;
    }
 
    static std::string normalize(const StringLike &s) noexcept;
 
    void initTransientFields(bool force = false) noexcept;
 
    explicit CandleSymbol(const StringLike &symbol) noexcept;
 
    CandleSymbol(const StringLike &symbol, const CandleSymbolAttributeVariant &attribute) noexcept;
 
    template <typename CandleSymbolAttributeIt>
    CandleSymbol(const StringLike &symbol, CandleSymbolAttributeIt begin, CandleSymbolAttributeIt end) noexcept
        : symbol_{normalize(changeAttributes(symbol, begin, end))} {
        initTransientFields();
    }
 
    public:
    /**
     * Returns base market symbol without attributes.
     *
     * @return base market symbol without attributes.
     */
    const std::string &getBaseSymbol() const & noexcept;
 
    /**
     * Returns exchange attribute of this symbol.
     *
     * @return exchange attribute of this symbol.
     */
    const std::optional<CandleExchange> &getExchange() const & noexcept;
 
    /**
     * Returns the price type attribute of this symbol.
     *
     * @return price type attribute of this symbol.
     */
    const std::optional<CandlePrice> &getPrice() const & noexcept;
 
    /**
     * Returns the session attribute of this symbol.
     *
     * @return session attribute of this symbol.
     */
    const std::optional<CandleSession> &getSession() const & noexcept;
 
    /**
     * Returns the aggregation period of this symbol.
     *
     * @return aggregation period of this symbol.
     */
    const std::optional<CandlePeriod> &getPeriod() const & noexcept;
 
    /**
     * Returns alignment attribute of this symbol.
     *
     * @return alignment attribute of this symbol.
     */
    const std::optional<CandleAlignment> &getAlignment() const & noexcept;
 
    /**
     * Returns the price level attribute of this symbol.
     *
     * @return price level attribute of this symbol.
     */
    const std::optional<CandlePriceLevel> &getPriceLevel() const & noexcept;
 
    /**
     * Returns string representation of this symbol.
     * The string representation can be transformed back into a symbol object
     * using the CandleSymbol::valueOf() method.
     *
     * @return string representation of this symbol.
     */
    const std::string &toString() const & noexcept;
 
    bool operator==(const CandleSymbol &candleSymbol) const noexcept;
 
    bool operator<(const CandleSymbol &candleSymbol) const noexcept;
 
    CandleSymbol(const CandleSymbol &candleSymbol) noexcept;
    CandleSymbol(CandleSymbol &&candleSymbol) noexcept;
    CandleSymbol &operator=(const CandleSymbol &candleSymbol) noexcept;
    CandleSymbol &operator=(CandleSymbol &&candleSymbol) noexcept;
    CandleSymbol() noexcept = default;
 
    virtual ~CandleSymbol() = default;
 
    /**
     * Allocates memory for the dxFeed Graal SDK structure (recursively if necessary).
     * Fills the dxFeed Graal SDK structure's fields by the data of the current entity (recursively if necessary).
     * Returns the pointer to the filled structure.
     *
     * @return The pointer to the filled dxFeed Graal SDK structure
     */
    virtual void *toGraal() const;
 
    /**
     * Releases the memory occupied by the dxFeed Graal SDK structure (recursively if necessary).
     *
     * @param graalNative The pointer to the dxFeed Graal SDK structure.
     * @throws InvalidArgumentException
     */
    static void freeGraal(void *graalNative);
 
    /**
     * Creates an object of the current type and fills it with data from the dxFeed Graal SDK structure.
     *
     * @param graalNative The pointer to the dxFeed Graal SDK structure.
     * @return The object of the current type.
     * @throws InvalidArgumentException
     */
    static CandleSymbol fromGraal(void *graalNative);
 
    /**
     * Converts the given string symbol into the candle symbol object.
     *
     * @param symbol The string symbol.
     * @return The candle symbol object.
     */
    static CandleSymbol valueOf(const StringLike &symbol) noexcept;
 
    /**
     * Converts the given string symbol into the candle symbol object with the specified attribute set.
     *
     * @param symbol The string symbol.
     * @param attribute The attribute to set.
     * @return The candle symbol object.
     */
    static CandleSymbol valueOf(const StringLike &symbol, const CandleSymbolAttributeVariant &attribute) noexcept;
 
    /**
     * Converts the given string symbol into the candle symbol object with the specified attribute set (iterators).
     *
     * @tparam CandleSymbolAttributeIt The attribute iterator type.
     * @param symbol The string symbol.
     * @param begin The beginning of the collection of attributes.
     * @param end The end of the collection of attributes.
     * @return
     */
    template <typename CandleSymbolAttributeIt>
    static CandleSymbol valueOf(const StringLike &symbol, CandleSymbolAttributeIt begin,
                                CandleSymbolAttributeIt end) noexcept {
        return CandleSymbol{symbol, begin, end};
    }
 
    /**
     * Converts the given string symbol into the candle symbol object with the specified attributes set (initializer
     * list).
     *
     * @param symbol The string symbol.
     * @param attributes More attributes to set.
     * @return The candle symbol object.
     */
    static CandleSymbol valueOf(const StringLike &symbol,
                                std::initializer_list<CandleSymbolAttributeVariant> attributes) noexcept;
 
    /**
     * Converts the given string symbol into the candle symbol object with the specified attributes set.
     *
     * @tparam CandleSymbolAttributesCollection The collection of attributes type.
     * @param symbol The string symbol.
     * @param attributes More attributes to set.
     * @return The candle symbol object.
     */
    template <typename CandleSymbolAttributesCollection>
        requires requires(CandleSymbolAttributesCollection attributes) {
            { std::begin(attributes) };
            { std::end(attributes) };
        }
    static CandleSymbol valueOf(const StringLike &symbol, CandleSymbolAttributesCollection &&attributes) noexcept {
        return valueOf(symbol, std::begin(attributes), std::end(attributes));
    }
};
 
inline namespace literals {
 
/**
 * String literal that helps to construct CandleSymbol from a char array.
 *
 * @param string The char array
 * @param length Tha char array's length
 * @return Wrapped string view built on char array
 */
inline CandleSymbol operator""_c(const char *string, size_t length) noexcept {
    return CandleSymbol::valueOf(std::string{string, length});
}
 
} // namespace literals
 
DXFCPP_END_NAMESPACE
 
template <> struct std::hash<dxfcpp::CandleSymbol> {
    std::size_t operator()(const dxfcpp::CandleSymbol &candleSymbol) const noexcept {
        return std::hash<std::string>{}(candleSymbol.toString());
    }
};
 
DXFCXX_DISABLE_MSC_WARNINGS_POP()