Error.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/CME/DropCopy/Export.h"
#include "OnixS/CME/DropCopy/Types.h"

#include <exception>
#include <string>

namespace OnixS { namespace CME { namespace DropCopy {

/// List of known errors.
struct ONIXS_CME_DROP_COPY_EXPORT KnownErrors
{
    /// List of known errors.
    enum Enum
    {
        /// Indicates absence of error.
        Nothing,

        /// Error has generic nature.
        Generic,

        /// Product is not licensed.
        NotLicensed,

        /// Handler configuration is invalid.
        BadConfiguration,

        /// FIX message has invalid structure.
        /// E.g. misses some of required fields.
        BadMessage
    };

    /// Returns constant from its text presentation.
    static Enum deserialize(const char* value);

    /// Returns string presentation of value.
    static const char* toString(Enum value);
};

/// Error code.
typedef KnownErrors::Enum ErrorCode;

/// Error.
class ONIXS_CME_DROP_COPY_EXPORT Error : public std::exception
{
public:
    /// Initializes instance with just a code.
    Error(const std::string& source, ErrorCode code);

    /// Initializes instance with code and description.
    Error(const std::string& source, ErrorCode code, const std::string& description);

    /// Initializes as clone of another error.
    Error(const Error& other);

    /// Destruction interface.
    virtual ~Error() throw();

    /// Code of error.
    ErrorCode code() const;

    /// Human readable description of error.
    const char* description() const;

    /// Origin of the error.
    const char* source() const;

    /// Human readable description of error.
    virtual const char* what() const throw();

    /// String presentation of an error.
    std::string toString() const;

    /// Appends presentation of an error to the string.
    void toString(std::string&) const;

    /// Copies error attributes from another instance.
    Error& operator=(const Error& other);

private:
    enum Traits
    {
        SourceMaxLength = 128,
        DescriptionMaxLength = 1024
    };

    ErrorCode code_;
    char source_[SourceMaxLength + 1];
    char description_[DescriptionMaxLength + 1];
};

inline ErrorCode Error::code() const
{
    return code_;
}

inline const char* Error::description() const
{
    return description_;
}

inline const char* Error::source() const
{
    return source_;
}

inline std::string Error::toString() const
{
    std::string str;
    toString(str);
    return str;
}

}}}

namespace std {
// Outputs message into standard stream.
ONIXS_CME_DROP_COPY_EXPORT std::ostream&
operator<<(std::ostream&, const OnixS::CME::DropCopy::Error&);
}