HandlerStateChange.h

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/*
 * Copyright (c) Onix Solutions Limited. All rights reserved.
 *
 * This software owned by Onix Solutions Limited 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.
 *
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 * the terms of the Agreement is a violation of copyright law.
 */

#pragma once

#include "Export.h"
#include "HandlerState.h"
#include "Types.h"

#include <string>

namespace OnixS { namespace ICE { namespace iMpact { namespace MarketData {

/// \brief Defines the interface through which the Handler
/// notifies subscribers about Handler state change events.
class ONIXS_ICEMDH_EXPORT HandlerStateChange
{
public:
    /// Initialize instance.
    HandlerStateChange(HandlerState newState, HandlerState oldState);

    /// New State.
    HandlerState newState() const;

    /// Old state.
    HandlerState oldState() const;

    /// String representation.
    std::string toString() const;

    /// Appends string representation.
    void toString(std::string&) const;

private:
    HandlerState newState_;
    HandlerState oldState_;

    HandlerStateChange(const HandlerStateChange&);

    HandlerStateChange& operator=(const HandlerStateChange&);
};

inline HandlerState HandlerStateChange::newState() const
{
    return newState_;
}

inline HandlerState HandlerStateChange::oldState() const
{
    return oldState_;
}

inline std::string HandlerStateChange::toString() const
{
    std::string str;

    toString(str);

    return str;
}

/// Make it printable to formatted C++ I/O streams.
ONIXS_ICEMDH_EXPORT std::ostream& operator<<(std::ostream&, const HandlerStateChange&);

}}}} // namespace OnixS::ICE::iMpact::MarketData