ByteStorage.cs

Go to the documentation of this file.

using System.Collections;
using System.Diagnostics.CodeAnalysis;
using System.Xml;
 
namespace System.Data.Common;
 
internal sealed class ByteStorage : DataStorage
{
    private byte[] _values;
 
    internal ByteStorage(DataColumn column)
        : base(column, typeof(byte), (byte)0, StorageType.Byte)
    {
    }
 
    public override object Aggregate(int[] records, AggregateType kind)
    {
        bool flag = false;
        try
        {
            switch (kind)
            {
            case AggregateType.Sum:
            {
                ulong num12 = 0uL;
                foreach (int num13 in records)
                {
                    if (!IsNull(num13))
                    {
                        num12 = checked(num12 + _values[num13]);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return num12;
                }
                return _nullValue;
            }
            case AggregateType.Mean:
            {
                long num7 = 0L;
                int num8 = 0;
                foreach (int num9 in records)
                {
                    if (!IsNull(num9))
                    {
                        num7 = checked(num7 + _values[num9]);
                        num8++;
                        flag = true;
                    }
                }
                checked
                {
                    if (flag)
                    {
                        byte b = (byte)unchecked(num7 / num8);
                        return b;
                    }
                    return _nullValue;
                }
            }
            case AggregateType.Var:
            case AggregateType.StDev:
            {
                int num = 0;
                double num2 = 0.0;
                double num3 = 0.0;
                double num4 = 0.0;
                double num5 = 0.0;
                foreach (int num6 in records)
                {
                    if (!IsNull(num6))
                    {
                        num4 += (double)(int)_values[num6];
                        num5 += (double)(int)_values[num6] * (double)(int)_values[num6];
                        num++;
                    }
                }
                if (num > 1)
                {
                    num2 = (double)num * num5 - num4 * num4;
                    num3 = num2 / (num4 * num4);
                    num2 = ((!(num3 < 1E-15) && !(num2 < 0.0)) ? (num2 / (double)(num * (num - 1))) : 0.0);
                    if (kind == AggregateType.StDev)
                    {
                        return Math.Sqrt(num2);
                    }
                    return num2;
                }
                return _nullValue;
            }
            case AggregateType.Min:
            {
                byte b3 = byte.MaxValue;
                foreach (int num11 in records)
                {
                    if (!IsNull(num11))
                    {
                        b3 = Math.Min(_values[num11], b3);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return b3;
                }
                return _nullValue;
            }
            case AggregateType.Max:
            {
                byte b2 = 0;
                foreach (int num10 in records)
                {
                    if (!IsNull(num10))
                    {
                        b2 = Math.Max(_values[num10], b2);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return b2;
                }
                return _nullValue;
            }
            case AggregateType.First:
                if (records.Length != 0)
                {
                    return _values[records[0]];
                }
                return null;
            case AggregateType.Count:
                return base.Aggregate(records, kind);
            }
        }
        catch (OverflowException)
        {
            throw ExprException.Overflow(typeof(byte));
        }
        throw ExceptionBuilder.AggregateException(kind, _dataType);
    }
 
    public override int Compare(int recordNo1, int recordNo2)
    {
        byte b = _values[recordNo1];
        byte b2 = _values[recordNo2];
        if (b == 0 || b2 == 0)
        {
            int num = CompareBits(recordNo1, recordNo2);
            if (num != 0)
            {
                return num;
            }
        }
        return b.CompareTo(b2);
    }
 
    public override int CompareValueTo(int recordNo, object value)
    {
        if (_nullValue == value)
        {
            if (IsNull(recordNo))
            {
                return 0;
            }
            return 1;
        }
        byte b = _values[recordNo];
        if (b == 0 && IsNull(recordNo))
        {
            return -1;
        }
        return b.CompareTo((byte)value);
    }
 
    public override object ConvertValue(object value)
    {
        if (_nullValue != value)
        {
            value = ((value == null) ? _nullValue : ((object)((IConvertible)value).ToByte(base.FormatProvider)));
        }
        return value;
    }
 
    public override void Copy(int recordNo1, int recordNo2)
    {
        CopyBits(recordNo1, recordNo2);
        _values[recordNo2] = _values[recordNo1];
    }
 
    public override object Get(int record)
    {
        byte b = _values[record];
        if (b != 0)
        {
            return b;
        }
        return GetBits(record);
    }
 
    public override void Set(int record, object value)
    {
        if (_nullValue == value)
        {
            _values[record] = 0;
            SetNullBit(record, flag: true);
        }
        else
        {
            _values[record] = ((IConvertible)value).ToByte(base.FormatProvider);
            SetNullBit(record, flag: false);
        }
    }
 
    public override void SetCapacity(int capacity)
    {
        byte[] array = new byte[capacity];
        if (_values != null)
        {
            Array.Copy(_values, array, Math.Min(capacity, _values.Length));
        }
        _values = array;
        base.SetCapacity(capacity);
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    public override object ConvertXmlToObject(string s)
    {
        return XmlConvert.ToByte(s);
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    public override string ConvertObjectToXml(object value)
    {
        return XmlConvert.ToString((byte)value);
    }
 
    protected override object GetEmptyStorage(int recordCount)
    {
        return new byte[recordCount];
    }
 
    protected override void CopyValue(int record, object store, BitArray nullbits, int storeIndex)
    {
        byte[] array = (byte[])store;
        array[storeIndex] = _values[record];
        nullbits.Set(storeIndex, IsNull(record));
    }
 
    protected override void SetStorage(object store, BitArray nullbits)
    {
        _values = (byte[])store;
        SetNullStorage(nullbits);
    }
}