Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / FieldNameLookup.cs / 1 / FieldNameLookup.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Text; internal sealed class FieldNameLookup { // V1.2.3300, MDAC 69015, 71470 // hashtable stores the index into the _fieldNames, match via case-sensitive private Hashtable _fieldNameLookup; // original names for linear searches when exact matches fail private string[] _fieldNames; // if _defaultLocaleID is -1 then _compareInfo is initialized with InvariantCulture CompareInfo // otherwise it is specified by the server? for the correct compare info private CompareInfo _compareInfo; private int _defaultLocaleID; #if !ORACLE public FieldNameLookup(string[] fieldNames, int defaultLocaleID) { // V1.2.3300 if (null == fieldNames) { throw ADP.ArgumentNull("fieldNames"); } _fieldNames = fieldNames; _defaultLocaleID = defaultLocaleID; } #endif public FieldNameLookup(IDataReader reader, int defaultLocaleID) { // V1.2.3300 int length = reader.FieldCount; string[] fieldNames = new string[length]; for (int i = 0; i < length; ++i) { fieldNames[i] = reader.GetName(i); Debug.Assert(null != fieldNames[i], "MDAC 66681"); } _fieldNames = fieldNames; _defaultLocaleID = defaultLocaleID; } public int GetOrdinal(string fieldName) { // V1.2.3300 if (null == fieldName) { throw ADP.ArgumentNull("fieldName"); } int index = IndexOf(fieldName); if (-1 == index) { throw ADP.IndexOutOfRange(fieldName); } return index; } #if !ORACLE public int IndexOfName(string fieldName) { // V1.2.3300 if (null == _fieldNameLookup) { GenerateLookup(); } // via case sensitive search, first match with lowest ordinal matches object value = _fieldNameLookup[fieldName]; return ((null != value) ? (int) value : -1); } #endif public int IndexOf(string fieldName) { // V1.2.3300 if (null == _fieldNameLookup) { GenerateLookup(); } int index; object value = _fieldNameLookup[fieldName]; if (null != value) { // via case sensitive search, first match with lowest ordinal matches index = (int) value; } else { // via case insensitive search, first match with lowest ordinal matches index = LinearIndexOf(fieldName, CompareOptions.IgnoreCase); if (-1 == index) { // do the slow search now (kana, width insensitive comparison) index = LinearIndexOf(fieldName, ADP.compareOptions); } } return index; } private int LinearIndexOf(string fieldName, CompareOptions compareOptions) { CompareInfo compareInfo = _compareInfo; if (null == compareInfo) { if (-1 != _defaultLocaleID) { compareInfo = CompareInfo.GetCompareInfo(_defaultLocaleID); } if (null == compareInfo) { compareInfo = CultureInfo.InvariantCulture.CompareInfo; } _compareInfo = compareInfo; } int length = _fieldNames.Length; for (int i = 0; i < length; ++i) { if (0 == compareInfo.Compare(fieldName, _fieldNames[i], compareOptions)) { _fieldNameLookup[fieldName] = i; // add an exact match for the future return i; } } return -1; } // RTM common code for generating Hashtable from array of column names private void GenerateLookup() { int length = _fieldNames.Length; Hashtable hash = new Hashtable(length); // via case sensitive search, first match with lowest ordinal matches for (int i = length-1; 0 <= i; --i) { string fieldName = _fieldNames[i]; hash[fieldName] = i; } _fieldNameLookup = hash; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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