AutoIncrementInt64.cs

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using System.Data.Common;
using System.Globalization;
using System.Numerics;
 
namespace System.Data;
 
internal sealed class AutoIncrementInt64 : AutoIncrementValue
{
    private long _current;
 
    private long _seed;
 
    private long _step = 1L;
 
    internal override object Current
    {
        get
        {
            return _current;
        }
        set
        {
            _current = (long)value;
        }
    }
 
    internal override Type DataType => typeof(long);
 
    internal override long Seed
    {
        get
        {
            return _seed;
        }
        set
        {
            if (_current == _seed || BoundaryCheck(value))
            {
                _current = value;
            }
            _seed = value;
        }
    }
 
    internal override long Step
    {
        get
        {
            return _step;
        }
        set
        {
            if (value == 0L)
            {
                throw ExceptionBuilder.AutoIncrementSeed();
            }
            if (_step != value)
            {
                if (_current != Seed)
                {
                    _current = _current - _step + value;
                }
                _step = value;
            }
        }
    }
 
    internal override void MoveAfter()
    {
        _current += _step;
    }
 
    internal override void SetCurrent(object value, IFormatProvider formatProvider)
    {
        _current = Convert.ToInt64(value, formatProvider);
    }
 
    internal override void SetCurrentAndIncrement(object value)
    {
        long num = (long)SqlConvert.ChangeType2(value, StorageType.Int64, typeof(long), CultureInfo.InvariantCulture);
        if (BoundaryCheck(num))
        {
            _current = num + _step;
        }
    }
 
    private bool BoundaryCheck(BigInteger value)
    {
        if (_step >= 0 || !(value <= _current))
        {
            if (0 < _step)
            {
                return _current <= value;
            }
            return false;
        }
        return true;
    }
}