Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / StringStorage.cs / 1 / StringStorage.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Diagnostics; using System.Globalization; using System.Data.SqlTypes; using System.Collections; // The string storage does not use BitArrays in DataStorage internal sealed class StringStorage : DataStorage { private String[] values; public StringStorage(DataColumn column) : base(column, typeof(String), String.Empty) { } override public Object Aggregate(int[] recordNos, AggregateType kind) { 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++) { Object value = values[recordNos[i]]; if (value != null) count++; } return count; } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { string valueNo1 = values[recordNo1]; string valueNo2 = values[recordNo2]; if ((Object)valueNo1 == (Object)valueNo2) return 0; if (valueNo1 == null) return -1; if (valueNo2 == null) return 1; return Table.Compare(valueNo1, valueNo2); } override public int CompareValueTo(int recordNo, Object value) { Debug.Assert(recordNo != -1, "Invalid (-1) parameter: 'recordNo'"); Debug.Assert(null != value, "null value"); string valueNo1 = values[recordNo]; if (null == valueNo1) { if (NullValue == value) { return 0; } else { return -1; } } else if (NullValue == value) { return 1; } return Table.Compare(valueNo1, (string)value); } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = value.ToString(); } else { value = NullValue; } } return value; } override public void Copy(int recordNo1, int recordNo2) { values[recordNo2] = values[recordNo1]; } override public Object Get(int recordNo) { String value = values[recordNo]; if (null != value) { return value; } return NullValue; } override public int GetStringLength(int record) { string value = values[record]; return ((null != value) ? value.Length : 0); } override public bool IsNull(int record) { return (null == values[record]); } override public void Set(int record, Object value) { System.Diagnostics.Debug.Assert(null != value, "null value"); if (NullValue == value) { values[record] = null; } else { values[record] = value.ToString(); } } override public void SetCapacity(int capacity) { string[] newValues = new string[capacity]; if (values != null) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { return s; } override public string ConvertObjectToXml(object value) { return (string)value; } override protected object GetEmptyStorage(int recordCount) { return new String[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { String[] typedStore = (String[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (String[]) 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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