|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Xml;
namespace System.Data.Common
{
internal sealed class CharStorage : DataStorage
{
private const char defaultValue = '\0';
private char[] _values = default!; // Late-initialized
internal CharStorage(DataColumn column) : base(column, typeof(char), defaultValue, StorageType.Char)
{
}
public override object Aggregate(int[] records, AggregateType kind)
{
bool hasData = false;
try
{
switch (kind)
{
case AggregateType.Min:
char min = char.MaxValue;
for (int i = 0; i < records.Length; i++)
{
int record = records[i];
if (IsNull(record))
continue;
min = (_values[record] < min) ? _values[record] : min;
hasData = true;
}
if (hasData)
{
return min;
}
return _nullValue;
case AggregateType.Max:
char max = char.MinValue;
for (int i = 0; i < records.Length; i++)
{
int record = records[i];
if (IsNull(record))
continue;
max = (_values[record] > max) ? _values[record] : max;
hasData = true;
}
if (hasData)
{
return max;
}
return _nullValue;
case AggregateType.First: // Does not seem to be implemented
if (records.Length > 0)
{
return _values[records[0]];
}
return null!;
case AggregateType.Count:
return base.Aggregate(records, kind);
}
}
catch (OverflowException)
{
throw ExprException.Overflow(typeof(char));
}
throw ExceptionBuilder.AggregateException(kind, _dataType);
}
public override int Compare(int recordNo1, int recordNo2)
{
char valueNo1 = _values[recordNo1];
char valueNo2 = _values[recordNo2];
if (valueNo1 == defaultValue || valueNo2 == defaultValue)
{
int bitCheck = CompareBits(recordNo1, recordNo2);
if (0 != bitCheck)
return bitCheck;
}
return valueNo1.CompareTo(valueNo2);
}
public override int CompareValueTo(int recordNo, object? value)
{
Debug.Assert(0 <= recordNo, "Invalid record");
System.Diagnostics.Debug.Assert(null != value, "null value");
if (_nullValue == value)
{
if (IsNull(recordNo))
{
return 0;
}
return 1;
}
char valueNo1 = _values[recordNo];
if ((defaultValue == valueNo1) && IsNull(recordNo))
{
return -1;
}
return valueNo1.CompareTo((char)value);
}
public override object ConvertValue(object? value)
{
if (_nullValue != value)
{
if (null != value)
{
value = ((IConvertible)value).ToChar(FormatProvider);
}
else
{
value = _nullValue;
}
}
return value;
}
public override void Copy(int recordNo1, int recordNo2)
{
CopyBits(recordNo1, recordNo2);
_values[recordNo2] = _values[recordNo1];
}
public override object Get(int record)
{
char value = _values[record];
if (value != defaultValue)
{
return value;
}
return GetBits(record);
}
public override void Set(int record, object value)
{
System.Diagnostics.Debug.Assert(null != value, "null value");
if (_nullValue == value)
{
_values[record] = defaultValue;
SetNullBit(record, true);
}
else
{
char ch = ((IConvertible)value).ToChar(FormatProvider);
if ((ch >= (char)0xd800 && ch <= (char)0xdfff) || (ch < (char)0x21 && (ch == (char)0x9 || ch == (char)0xa || ch == (char)0xd)))
{
throw ExceptionBuilder.ProblematicChars(ch);
}
_values[record] = ch;
SetNullBit(record, false);
}
}
public override void SetCapacity(int capacity)
{
Array.Resize(ref _values, capacity);
base.SetCapacity(capacity);
}
[RequiresUnreferencedCode(DataSet.RequiresUnreferencedCodeMessage)]
public override object ConvertXmlToObject(string s)
{
return XmlConvert.ToChar(s);
}
[RequiresUnreferencedCode(DataSet.RequiresUnreferencedCodeMessage)]
public override string ConvertObjectToXml(object value)
{
return XmlConvert.ToString((char)value);
}
protected override object GetEmptyStorage(int recordCount)
{
return new char[recordCount];
}
protected override void CopyValue(int record, object store, BitArray nullbits, int storeIndex)
{
char[] typedStore = (char[])store;
typedStore[storeIndex] = _values[record];
nullbits.Set(storeIndex, IsNull(record));
}
protected override void SetStorage(object store, BitArray nullbits)
{
_values = (char[])store;
SetNullStorage(nullbits);
}
}
}
|