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

   1 //------------------------------------------------------------------------------
   2 // <copyright file="SqlXmlStorage.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">[....]</owner>
   6 // <owner current="true" primary="false">[....]</owner>
   7 // <owner current="false" primary="false">[....]</owner>
   8 //------------------------------------------------------------------------------
   9
  10 namespace System.Data.Common {
  11     using System;
  12     using System.Xml;
  13     using System.IO;
  14     using System.Xml.Serialization;
  15     using System.Data.SqlTypes;
  16     using System.Diagnostics;
  17     using System.Text;
  18     using System.Collections;
  19     internal sealed class SqlXmlStorage : DataStorage {
  20
  21         private SqlXml[] values;
  22
  23         public SqlXmlStorage(DataColumn column)
  24         : base(column, typeof(SqlXml), SqlXml.Null, SqlXml.Null, StorageType.Empty) {
  25         }
  26
  27         override public Object Aggregate(int[] records, AggregateType kind) {
  28             try {
  29                 switch (kind) {
  30                     case AggregateType.First:
  31                         if (records.Length > 0) {
  32                             return values[records[0]];
  33                         }
  34                         return null;// no data => null
  35
  36                     case AggregateType.Count:
  37                         int count = 0;
  38                         for (int i = 0; i < records.Length; i++) {
  39                             if (!IsNull(records[i]))
  40                                 count++;
  41                         }
  42                         return count;
  43                 }
  44             }
  45             catch (OverflowException) {
  46                 throw ExprException.Overflow(typeof(SqlXml));
  47             }
  48             throw ExceptionBuilder.AggregateException(kind, _dataType);
  49         }
  50
  51         override public int Compare(int recordNo1, int recordNo2) {
  52             //return values[recordNo1].CompareTo(values[recordNo2]);
  53             return 0;
  54         }
  55
  56         override public int CompareValueTo(int recordNo, Object value) {
  57             // SqlXml valueNo2 = ((value == null)||(value == DBNull.Value))? SqlXml.Null : (SqlXml)value;
  58             // return values[recordNo].CompareTo(valueNo2);
  59             return 0;
  60         }
  61
  62         override public void Copy(int recordNo1, int recordNo2) {
  63             values[recordNo2] = values[recordNo1];
  64         }
  65
  66         override public Object Get(int record) {
  67             return values[record];
  68         }
  69
  70         override public bool IsNull(int record) {
  71             return (values[record].IsNull);
  72         }
  73
  74         override public void Set(int record, Object value) {
  75             if ((value ==  DBNull.Value) || (value == null)){
  76                 values[record] = SqlXml.Null;
  77             }
  78             else {
  79                 values[record] = (SqlXml)value;
  80             }
  81         }
  82
  83         override public void SetCapacity(int capacity) {
  84             SqlXml[] newValues = new SqlXml[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             XmlTextReader reader =  new XmlTextReader(s, XmlNodeType.Element, null) ;
  93             return (new SqlXml(reader));
  94
  95
  96 /*            SqlXml newValue = new SqlXml();
  97
  98             StringReader strReader = new  StringReader(s);
  99             XmlTextReader xmlTextReader = new XmlTextReader(strReader);
 100             ((IXmlSerializable)newValue).ReadXml(xmlTextReader);
 101             xmlTextReader.Close();
 102             return newValue;
 103 */
 104         }
 105
 106         override public string ConvertObjectToXml(object value) {
 107             SqlXml reader = (SqlXml) value;
 108             if (reader.IsNull)
 109                 return ADP.StrEmpty;
 110             else
 111                 return reader.Value;        // SqlXml.Value returns string
 112
 113         }
 114
 115         override protected object GetEmptyStorage(int recordCount) {
 116             return new SqlXml[recordCount];
 117         }
 118
 119         override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
 120             SqlXml[] typedStore = (SqlXml[]) store;
 121             typedStore[storeIndex] = values[record];
 122             nullbits.Set(storeIndex, IsNull(record));
 123         }
 124
 125         override protected void SetStorage(object store, BitArray nullbits) {
 126             values = (SqlXml[]) store;
 127             //SetNullStorage(nullbits);
 128         }
 129     }
 130 }