Int16Storage.cs

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using System.Collections;
using System.Diagnostics.CodeAnalysis;
using System.Xml;
 
namespace System.Data.Common;
 
internal sealed class Int16Storage : DataStorage
{
    private short[] _values;
 
    internal Int16Storage(DataColumn column)
        : base(column, typeof(short), (short)0, StorageType.Int16)
    {
    }
 
    public override object Aggregate(int[] records, AggregateType kind)
    {
        bool flag = false;
        try
        {
            switch (kind)
            {
            case AggregateType.Sum:
            {
                long num4 = 0L;
                foreach (int num5 in records)
                {
                    if (HasValue(num5))
                    {
                        num4 = checked(num4 + _values[num5]);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return num4;
                }
                return _nullValue;
            }
            case AggregateType.Mean:
            {
                long num11 = 0L;
                int num12 = 0;
                foreach (int num13 in records)
                {
                    if (HasValue(num13))
                    {
                        num11 = checked(num11 + _values[num13]);
                        num12++;
                        flag = true;
                    }
                }
                checked
                {
                    if (flag)
                    {
                        short num14 = (short)unchecked(num11 / num12);
                        return num14;
                    }
                    return _nullValue;
                }
            }
            case AggregateType.Var:
            case AggregateType.StDev:
            {
                int num = 0;
                double num6 = 0.0;
                double num7 = 0.0;
                double num8 = 0.0;
                double num9 = 0.0;
                foreach (int num10 in records)
                {
                    if (HasValue(num10))
                    {
                        num8 += (double)_values[num10];
                        num9 += (double)_values[num10] * (double)_values[num10];
                        num++;
                    }
                }
                if (num > 1)
                {
                    num6 = (double)num * num9 - num8 * num8;
                    num7 = num6 / (num8 * num8);
                    num6 = ((!(num7 < 1E-15) && !(num6 < 0.0)) ? (num6 / (double)(num * (num - 1))) : 0.0);
                    if (kind == AggregateType.StDev)
                    {
                        return Math.Sqrt(num6);
                    }
                    return num6;
                }
                return _nullValue;
            }
            case AggregateType.Min:
            {
                short num2 = short.MaxValue;
                foreach (int num3 in records)
                {
                    if (HasValue(num3))
                    {
                        num2 = Math.Min(_values[num3], num2);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return num2;
                }
                return _nullValue;
            }
            case AggregateType.Max:
            {
                short num15 = short.MinValue;
                foreach (int num16 in records)
                {
                    if (HasValue(num16))
                    {
                        num15 = Math.Max(_values[num16], num15);
                        flag = true;
                    }
                }
                if (flag)
                {
                    return num15;
                }
                return _nullValue;
            }
            case AggregateType.First:
                if (records.Length != 0)
                {
                    return _values[records[0]];
                }
                return null;
            case AggregateType.Count:
            {
                int num = 0;
                for (int i = 0; i < records.Length; i++)
                {
                    if (HasValue(records[i]))
                    {
                        num++;
                    }
                }
                return num;
            }
            }
        }
        catch (OverflowException)
        {
            throw ExprException.Overflow(typeof(short));
        }
        throw ExceptionBuilder.AggregateException(kind, _dataType);
    }
 
    public override int Compare(int recordNo1, int recordNo2)
    {
        short num = _values[recordNo1];
        short num2 = _values[recordNo2];
        if (num == 0 || num2 == 0)
        {
            int num3 = CompareBits(recordNo1, recordNo2);
            if (num3 != 0)
            {
                return num3;
            }
        }
        return num - num2;
    }
 
    public override int CompareValueTo(int recordNo, object value)
    {
        if (_nullValue == value)
        {
            if (!HasValue(recordNo))
            {
                return 0;
            }
            return 1;
        }
        short num = _values[recordNo];
        if (num == 0 && !HasValue(recordNo))
        {
            return -1;
        }
        return num.CompareTo((short)value);
    }
 
    public override object ConvertValue(object value)
    {
        if (_nullValue != value)
        {
            value = ((value == null) ? _nullValue : ((object)((IConvertible)value).ToInt16(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)
    {
        short num = _values[record];
        if (num != 0)
        {
            return num;
        }
        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).ToInt16(base.FormatProvider);
            SetNullBit(record, flag: false);
        }
    }
 
    public override void SetCapacity(int capacity)
    {
        short[] array = new short[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.ToInt16(s);
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    public override string ConvertObjectToXml(object value)
    {
        return XmlConvert.ToString((short)value);
    }
 
    protected override object GetEmptyStorage(int recordCount)
    {
        return new short[recordCount];
    }
 
    protected override void CopyValue(int record, object store, BitArray nullbits, int storeIndex)
    {
        short[] array = (short[])store;
        array[storeIndex] = _values[record];
        nullbits.Set(storeIndex, !HasValue(record));
    }
 
    protected override void SetStorage(object store, BitArray nullbits)
    {
        _values = (short[])store;
        SetNullStorage(nullbits);
    }
}