Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLStringStorage.cs / 1 / SQLStringStorage.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Xml; using System.Globalization; using System.Data.SqlTypes; using System.Diagnostics; using System.IO; using System.Xml.Serialization; using System.Collections; internal sealed class SqlStringStorage : DataStorage { private SqlString[] values; public SqlStringStorage(DataColumn column) : base(column, typeof(SqlString), SqlString.Null, SqlString.Null) { } override public Object Aggregate(int[] recordNos, AggregateType kind) { try { int i; switch (kind) { case AggregateType.Min: int min = -1; for (i = 0; i < recordNos.Length; i++) { if (IsNull(recordNos[i])) continue; min = recordNos[i]; break; } if (min >= 0) { for (i = i+1; i < recordNos.Length; i++) { if (IsNull(recordNos[i])) continue; if (Compare(min, recordNos[i]) > 0) { min = recordNos[i]; } } return Get(min); } return NullValue; case AggregateType.Max: int max = -1; for (i = 0; i < recordNos.Length; i++) { if (IsNull(recordNos[i])) continue; max = recordNos[i]; break; } if (max >= 0) { for (i = i+1; i < recordNos.Length; i++) { if (Compare(max, recordNos[i]) < 0) { max = recordNos[i]; } } return Get(max); } return NullValue; case AggregateType.Count: int count = 0; for (i = 0; i < recordNos.Length; i++) { if (!IsNull(recordNos[i])) count++; } return count; } } catch (OverflowException) { throw ExprException.Overflow(typeof(SqlString)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { return Compare(values[recordNo1], values[recordNo2]); } public int Compare(SqlString valueNo1, SqlString valueNo2) { if (valueNo1.IsNull && valueNo2.IsNull) return 0; if (valueNo1.IsNull) return -1; if (valueNo2.IsNull) return 1; return Table.Compare(valueNo1.Value, valueNo2.Value); } override public int CompareValueTo(int recordNo, Object value) { return Compare(values[recordNo], (SqlString)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlString(value); } return NullValue; } override public void Copy(int recordNo1, int recordNo2) { values[recordNo2] = values[recordNo1]; } override public Object Get(int record) { return values[record]; } override public int GetStringLength(int record) { SqlString value = values[record]; return ((value.IsNull) ? 0 : value.Value.Length); } override public bool IsNull(int record) { return (values[record].IsNull); } override public void Set(int record, Object value) { values[record] = SqlConvert.ConvertToSqlString(value); } override public void SetCapacity(int capacity) { SqlString[] newValues = new SqlString[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlString newValue = new SqlString(); string tempStr =string.Concat("", s, ""); // this is done since you can give fragmet to reader, bug 98767 StringReader strReader = new StringReader(tempStr); IXmlSerializable tmp = newValue; using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) { tmp.ReadXml(xmlTextReader); } return ((SqlString)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlString)), "wrong input type"); StringWriter strwriter = new StringWriter(FormatProvider); // consider passing cultureinfo with CultureInfo.InvariantCulture using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) { ((IXmlSerializable)value).WriteXml(xmlTextWriter); } return (strwriter.ToString ()); } override protected object GetEmptyStorage(int recordCount) { return new SqlString[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlString[] typedStore = (SqlString[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlString[]) store; //SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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