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

   1 //------------------------------------------------------------------------------
   2 // <copyright file="SQLBinaryStorage.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 SqlBinaryStorage : DataStorage {
  21
  22         private SqlBinary[] values;
  23
  24         public SqlBinaryStorage(DataColumn column)
  25         : base(column, typeof(SqlBinary), SqlBinary.Null, SqlBinary.Null, StorageType.SqlBinary) {
  26         }
  27
  28         override public Object Aggregate(int[] records, AggregateType kind) {
  29             try {
  30                 switch (kind) {
  31                     case AggregateType.First:
  32                         if (records.Length > 0) {
  33                             return values[records[0]];
  34                         }
  35                         return null;
  36
  37                     case AggregateType.Count:
  38                         int count = 0;
  39                         for (int i = 0; i < records.Length; i++) {
  40                             if (!IsNull(records[i]))
  41                                 count++;
  42                         }
  43                         return count;
  44                 }
  45                 }
  46             catch (OverflowException) {
  47                 throw ExprException.Overflow(typeof(SqlBinary));
  48             }
  49             throw ExceptionBuilder.AggregateException(kind, DataType);
  50         }
  51
  52         override public int Compare(int recordNo1, int recordNo2) {
  53             return values[recordNo1].CompareTo(values[recordNo2]);
  54         }
  55
  56         override public int CompareValueTo(int recordNo, Object value) {
  57             return values[recordNo].CompareTo((SqlBinary)value);
  58         }
  59
  60         override public object ConvertValue(object value) {
  61             if (null != value) {
  62                 return SqlConvert.ConvertToSqlBinary(value);
  63             }
  64             return NullValue;
  65         }
  66
  67         override public void Copy(int recordNo1, int recordNo2) {
  68             values[recordNo2] = values[recordNo1];
  69         }
  70
  71         override public Object Get(int record) {
  72             return values[record];
  73         }
  74
  75         override public bool IsNull(int record) {
  76             return (values[record].IsNull);
  77         }
  78
  79         override public void Set(int record, Object value) {
  80             values[record] = SqlConvert.ConvertToSqlBinary(value);
  81         }
  82
  83         override public void SetCapacity(int capacity) {
  84             SqlBinary[] newValues = new SqlBinary[capacity];
  85             if (null != values) {
  86                 Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
  87             }
  88             values = newValues;
  89         }
  90
  91         override public object ConvertXmlToObject(string s) {
  92             SqlBinary newValue = new SqlBinary();
  93             string tempStr =string.Concat("<col>", s, "</col>"); // this is done since you can give fragmet to reader, bug 98767
  94             StringReader strReader = new  StringReader(tempStr);
  95
  96             IXmlSerializable tmp = newValue;
  97
  98             using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) {
  99                 tmp.ReadXml(xmlTextReader);
 100             }
 101             return ((SqlBinary)tmp);
 102         }
 103
 104         override public string ConvertObjectToXml(object value) {
 105             Debug.Assert(!DataStorage.IsObjectNull(value), "we should have null here");
 106             Debug.Assert((value.GetType() == typeof(SqlBinary)), "wrong input type");
 107
 108             StringWriter strwriter = new StringWriter(FormatProvider);
 109
 110             using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) {
 111                 ((IXmlSerializable)value).WriteXml(xmlTextWriter);
 112             }
 113             return (strwriter.ToString ());
 114         }
 115
 116         override protected object GetEmptyStorage(int recordCount) {
 117             return new SqlBinary[recordCount];
 118         }
 119
 120         override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
 121             SqlBinary[] typedStore = (SqlBinary[]) store;
 122             typedStore[storeIndex] = values[record];
 123             nullbits.Set(storeIndex, IsNull(record));
 124         }
 125
 126         override protected void SetStorage(object store, BitArray nullbits) {
 127             values = (SqlBinary[]) store;
 128             //SetNullStorage(nullbits);
 129         }
 130     }
 131 }