SqlInt16Storage.cs

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using System.Collections;
using System.Data.SqlTypes;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
 
namespace System.Data.Common;
 
internal sealed class SqlInt16Storage : DataStorage
{
    private SqlInt16[] _values;
 
    public SqlInt16Storage(DataColumn column)
        : base(column, typeof(SqlInt16), SqlInt16.Null, SqlInt16.Null, StorageType.SqlInt16)
    {
    }
 
    public override object Aggregate(int[] records, AggregateType kind)
    {
        bool flag = false;
        try
        {
            switch (kind)
            {
            case AggregateType.Sum:
            {
                SqlInt64 sqlInt2 = 0L;
                foreach (int num3 in records)
                {
                    if (!IsNull(num3))
                    {
                        sqlInt2 += (SqlInt64)_values[num3];
                        flag = true;
                    }
                }
                if (flag)
                {
                    return sqlInt2;
                }
                return _nullValue;
            }
            case AggregateType.Mean:
            {
                SqlInt64 sqlInt3 = 0L;
                int num5 = 0;
                foreach (int num6 in records)
                {
                    if (!IsNull(num6))
                    {
                        sqlInt3 += _values[num6].ToSqlInt64();
                        num5++;
                        flag = true;
                    }
                }
                if (flag)
                {
                    SqlInt16 sqlInt4 = (short)0;
                    sqlInt4 = (sqlInt3 / num5).ToSqlInt16();
                    return sqlInt4;
                }
                return _nullValue;
            }
            case AggregateType.Var:
            case AggregateType.StDev:
            {
                int num = 0;
                SqlDouble sqlDouble = 0.0;
                SqlDouble sqlDouble2 = 0.0;
                SqlDouble sqlDouble3 = 0.0;
                SqlDouble sqlDouble4 = 0.0;
                foreach (int num4 in records)
                {
                    if (!IsNull(num4))
                    {
                        sqlDouble3 += _values[num4].ToSqlDouble();
                        sqlDouble4 += _values[num4].ToSqlDouble() * _values[num4].ToSqlDouble();
                        num++;
                    }
                }
                if (num > 1)
                {
                    sqlDouble = num * sqlDouble4 - sqlDouble3 * sqlDouble3;
                    sqlDouble2 = sqlDouble / (sqlDouble3 * sqlDouble3);
                    if (sqlDouble2 < 1E-15 || sqlDouble < 0.0)
                    {
                        sqlDouble = 0.0;
                    }
                    else
                    {
                        sqlDouble /= (SqlDouble)(num * (num - 1));
                    }
                    if (kind == AggregateType.StDev)
                    {
                        return Math.Sqrt(sqlDouble.Value);
                    }
                    return sqlDouble;
                }
                return _nullValue;
            }
            case AggregateType.Min:
            {
                SqlInt16 sqlInt = SqlInt16.MaxValue;
                foreach (int num2 in records)
                {
                    if (!IsNull(num2))
                    {
                        if (SqlInt16.LessThan(_values[num2], sqlInt).IsTrue)
                        {
                            sqlInt = _values[num2];
                        }
                        flag = true;
                    }
                }
                if (flag)
                {
                    return sqlInt;
                }
                return _nullValue;
            }
            case AggregateType.Max:
            {
                SqlInt16 sqlInt5 = SqlInt16.MinValue;
                foreach (int num7 in records)
                {
                    if (!IsNull(num7))
                    {
                        if (SqlInt16.GreaterThan(_values[num7], sqlInt5).IsTrue)
                        {
                            sqlInt5 = _values[num7];
                        }
                        flag = true;
                    }
                }
                if (flag)
                {
                    return sqlInt5;
                }
                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 (!IsNull(records[i]))
                    {
                        num++;
                    }
                }
                return num;
            }
            }
        }
        catch (OverflowException)
        {
            throw ExprException.Overflow(typeof(SqlInt16));
        }
        throw ExceptionBuilder.AggregateException(kind, _dataType);
    }
 
    public override int Compare(int recordNo1, int recordNo2)
    {
        return _values[recordNo1].CompareTo(_values[recordNo2]);
    }
 
    public override int CompareValueTo(int recordNo, object value)
    {
        return _values[recordNo].CompareTo((SqlInt16)value);
    }
 
    public override object ConvertValue(object value)
    {
        if (value != null)
        {
            return SqlConvert.ConvertToSqlInt16(value);
        }
        return _nullValue;
    }
 
    public override void Copy(int recordNo1, int recordNo2)
    {
        _values[recordNo2] = _values[recordNo1];
    }
 
    public override object Get(int record)
    {
        return _values[record];
    }
 
    public override bool IsNull(int record)
    {
        return _values[record].IsNull;
    }
 
    public override void Set(int record, object value)
    {
        _values[record] = SqlConvert.ConvertToSqlInt16(value);
    }
 
    public override void SetCapacity(int capacity)
    {
        SqlInt16[] array = new SqlInt16[capacity];
        if (_values != null)
        {
            Array.Copy(_values, array, Math.Min(capacity, _values.Length));
        }
        _values = array;
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    public override object ConvertXmlToObject(string s)
    {
        SqlInt16 sqlInt = default(SqlInt16);
        string s2 = "<col>" + s + "</col>";
        StringReader input = new StringReader(s2);
        IXmlSerializable xmlSerializable = sqlInt;
        using (XmlTextReader reader = new XmlTextReader(input))
        {
            xmlSerializable.ReadXml(reader);
        }
        return (SqlInt16)(object)xmlSerializable;
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    public override string ConvertObjectToXml(object value)
    {
        StringWriter stringWriter = new StringWriter(base.FormatProvider);
        using (XmlTextWriter writer = new XmlTextWriter(stringWriter))
        {
            ((IXmlSerializable)value).WriteXml(writer);
        }
        return stringWriter.ToString();
    }
 
    protected override object GetEmptyStorage(int recordCount)
    {
        return new SqlInt16[recordCount];
    }
 
    protected override void CopyValue(int record, object store, BitArray nullbits, int storeIndex)
    {
        SqlInt16[] array = (SqlInt16[])store;
        array[storeIndex] = _values[record];
        nullbits.Set(storeIndex, IsNull(record));
    }
 
    protected override void SetStorage(object store, BitArray nullbits)
    {
        _values = (SqlInt16[])store;
    }
}