mcs/class/referencesource/System.Data/System/Data/Common/SQLTypes/SQlBooleanStorage.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="SQLBooleanStorage.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 // <owner current="true" primary="false">Microsoft</owner>
   7 // <owner current="false" primary="false">Microsoft</owner>
   8 //------------------------------------------------------------------------------
   9
  10 namespace System.Data.Common {
  11     using System;
  12     using System.Xml;
  13     using System.Data.SqlTypes;
  14     using System.Diagnostics;
  15     using System.Globalization;
  16     using System.IO;
  17     using System.Xml.Serialization;
  18     using System.Collections;
  19
  20     internal sealed class SqlBooleanStorage : DataStorage {
  21
  22         private SqlBoolean[] values;
  23
  24         public SqlBooleanStorage(DataColumn column)
  25         : base(column, typeof(SqlBoolean), SqlBoolean.Null, SqlBoolean.Null, StorageType.SqlBoolean) {
  26         }
  27
  28         override public Object Aggregate(int[] records, AggregateType kind) {
  29             bool hasData = false;
  30             try {
  31                 switch (kind) {
  32                     case AggregateType.Min:
  33                         SqlBoolean min = true;
  34                         for (int i = 0; i < records.Length; i++) {
  35                             int record = records[i];
  36                             if (IsNull(record))
  37                                 continue;
  38                             min= SqlBoolean.And(values[record], min);
  39                             hasData = true;
  40                         }
  41                         if (hasData) {
  42                             return min;
  43                         }
  44                         return NullValue;
  45
  46                     case AggregateType.Max:
  47                         SqlBoolean max = false;
  48                         for (int i = 0; i < records.Length; i++) {
  49                             int record = records[i];
  50                             if (IsNull(record))
  51                                 continue;
  52                             max= SqlBoolean.Or(values[record], max);
  53                             hasData = true;
  54                         }
  55                         if (hasData) {
  56                             return max;
  57                         }
  58                         return NullValue;
  59
  60                     case AggregateType.First:
  61                         if (records.Length > 0) {
  62                             return values[records[0]];
  63                         }
  64                         return NullValue;
  65
  66                     case AggregateType.Count:
  67                         int count = 0;
  68                         for (int i = 0; i < records.Length; i++) {
  69                             if (!IsNull(records[i]))
  70                                 count++;
  71                         }
  72                         return count;
  73                 }
  74             }
  75             catch (OverflowException) {
  76                 throw ExprException.Overflow(typeof(SqlBoolean));
  77             }
  78             throw ExceptionBuilder.AggregateException(kind, DataType);
  79         }
  80
  81         override public int Compare(int recordNo1, int recordNo2) {
  82             return values[recordNo1].CompareTo(values[recordNo2]);
  83         }
  84
  85         override public int CompareValueTo(int recordNo, Object value) {
  86             return values[recordNo].CompareTo((SqlBoolean)value);
  87         }
  88
  89         override public object ConvertValue(object value) {
  90             if (null != value) {
  91                 return SqlConvert.ConvertToSqlBoolean(value);
  92             }
  93             return NullValue;
  94         }
  95
  96         override public void Copy(int recordNo1, int recordNo2) {
  97             values[recordNo2] = values[recordNo1];
  98         }
  99
 100         override public Object Get(int record) {
 101             return values[record];
 102         }
 103
 104         override public bool IsNull(int record) {
 105             return (values[record].IsNull);
 106         }
 107
 108         override public void Set(int record, Object value) {
 109             values[record] = SqlConvert.ConvertToSqlBoolean(value);
 110         }
 111
 112         override public void SetCapacity(int capacity) {
 113             SqlBoolean[] newValues = new SqlBoolean[capacity];
 114             if (null != values) {
 115                 Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
 116             }
 117             values = newValues;
 118         }
 119
 120         override public object ConvertXmlToObject(string s) {
 121             SqlBoolean newValue = new SqlBoolean();
 122             string tempStr =string.Concat("<col>", s, "</col>"); // this is done since you can give fragmet to reader,
 123             StringReader strReader = new  StringReader(tempStr);
 124
 125             IXmlSerializable tmp = newValue;
 126
 127             using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) {
 128                 tmp.ReadXml(xmlTextReader);
 129             }
 130             return ((SqlBoolean)tmp);
 131         }
 132
 133         override public string ConvertObjectToXml(object value) {
 134             Debug.Assert(!DataStorage.IsObjectNull(value), "we should have null here");
 135             Debug.Assert((value.GetType() == typeof(SqlBoolean)), "wrong input type");
 136
 137             StringWriter strwriter = new StringWriter(FormatProvider);
 138
 139             using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) {
 140                 ((IXmlSerializable)value).WriteXml(xmlTextWriter);
 141             }
 142             return (strwriter.ToString ());
 143         }
 144
 145         override protected object GetEmptyStorage(int recordCount) {
 146             return new SqlBoolean[recordCount];
 147         }
 148
 149         override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
 150             SqlBoolean[] typedStore = (SqlBoolean[]) store;
 151             typedStore[storeIndex] = values[record];
 152             nullbits.Set(storeIndex, IsNull(record));
 153         }
 154
 155         override protected void SetStorage(object store, BitArray nullbits) {
 156             values = (SqlBoolean[]) store;
 157             //SetNullStorage(nullbits);
 158         }
 159     }
 160 }