Field.h

/*
╔══════════════════════════════════════════════════════════════════════════════╗
║                       SIMPLY POWERFUL TOOLKIT (SPTK)                         ║
╟──────────────────────────────────────────────────────────────────────────────╢
║  copyright            © 1999-2022 Alexey Parshin. All rights reserved.       ║
║  email                alexeyp@gmail.com                                      ║
╚══════════════════════════════════════════════════════════════════════════════╝
┌──────────────────────────────────────────────────────────────────────────────┐
│   This library is free software; you can redistribute it and/or modify it    │
│   under the terms of the GNU Library General Public License as published by  │
│   the Free Software Foundation; either version 2 of the License, or (at your │
│   option) any later version.                                                 │
│                                                                              │
│   This library is distributed in the hope that it will be useful, but        │
│   WITHOUT ANY WARRANTY; without even the implied warranty of                 │
│   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library   │
│   General Public License for more details.                                   │
│                                                                              │
│   You should have received a copy of the GNU Library General Public License  │
│   along with this library; if not, write to the Free Software Foundation,    │
│   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.               │
│                                                                              │
│   Please report all bugs and problems to alexeyp@gmail.com.                  │
└──────────────────────────────────────────────────────────────────────────────┘
*/
 
#pragma once
 
#include <sptk5/Buffer.h>
#include <sptk5/DateTime.h>
#include <sptk5/Variant.h>
#include <sptk5/xdoc/Node.h>
 
#include <string>
 
namespace sptk {
 
class Query;
 
class FieldList;
 
class SP_EXPORT Field
    : public Variant
{
    friend class FieldList;
 
public:
    struct View {
        signed int width : 10;  
        unsigned precision : 5; 
        unsigned flags : 16;    
        bool visible : 1;       
    };
 
    explicit Field(const String& name);
 
    Field(const Field& other) = default;
 
    Field(Field&& other) noexcept = default;
 
    ~Field() noexcept override = default;
 
    View& view()
    {
        return m_view;
    };
 
    const String& fieldName() const
    {
        return m_name;
    }
 
    Field& operator=(const Field& other) = default;
 
    Field& operator=(Field&& other) noexcept = default;
 
    Field& operator=(const Variant& C)
    {
        if (this == &C)
        {
            return *this;
        }
 
        setData(C);
        return *this;
    }
 
    Field& operator=(bool value) override
    {
        setBool(value);
        return *this;
    }
 
    Field& operator=(int32_t value) override
    {
        setInteger(value);
        return *this;
    }
 
    Field& operator=(int64_t value) override
    {
        setInt64(value);
        return *this;
    }
 
    Field& operator=(double value) override
    {
        setFloat(value);
        return *this;
    }
 
    Field& operator=(const char* value) override
    {
        setString(value);
        return *this;
    }
 
    Field& operator=(const sptk::String& value) override
    {
        setBuffer((const uint8_t*) value.c_str(), value.length(), VariantDataType::VAR_STRING);
        return *this;
    }
 
    Field& operator=(DateTime value) override
    {
        setDateTime(value);
        return *this;
    }
 
    Field& operator=(const uint8_t* value) override
    {
        setImagePtr(value);
        return *this;
    }
 
    Field& operator=(const Buffer& value) override
    {
        setBuffer(value.data(), value.bytes(), VariantDataType::VAR_BUFFER);
        return *this;
    }
 
    String asString() const override;
 
    void exportTo(const xdoc::SNode& node, bool compactXmlMode, bool detailedInfo = false, bool nullLargeData = false) const;
 
    String displayName() const
    {
        return m_displayName;
    }
 
    void displayName(const String& name)
    {
        m_displayName = name;
    }
 
protected:
    virtual String doubleDataToString() const;
 
private:
    String m_name;        
    View m_view {};       
    String m_displayName; 
 
    String epochDataToDateTimeString() const;
};
 
using SField = std::shared_ptr<Field>;
 
} // namespace sptk