mcs/class/System.Data/System.Data.SqlTypes/SqlXml.cs

   1 //
   2 // System.Data.SqlTypes.SqlXml
   3 //
   4 // Author:
   5 //      Umadevi S (sumadevi@novell.com)
   6 //      Veerapuram Varadhan  (vvaradhan@novell.com>)
   7 //
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.IO;
  32 using System.Xml;
  33 using System.Xml.Schema;
  34 using System.Globalization;
  35 using System.Threading;
  36 using System.Xml.Serialization;
  37 using System.Text;
  38
  39
  40 namespace System.Data.SqlTypes
  41 {
  42         [SerializableAttribute]
  43         [XmlSchemaProvider ("GetXsdType")]
  44         public sealed class SqlXml : INullable, IXmlSerializable
  45         {
  46                 bool notNull;
  47                 string xmlValue;
  48
  49                 public SqlXml ()
  50                 {
  51                         notNull = false;
  52                         xmlValue = null;
  53                 }
  54
  55                 public SqlXml (Stream value)
  56                 {
  57                         if (value == null) {
  58                                 notNull = false;
  59                                 xmlValue = null;
  60                         } else {
  61                                 int len = (int) value.Length;
  62
  63                                 if (len < 1) {
  64                                         xmlValue = String.Empty;
  65                                 } else {
  66                                         int bufSize = 8192;
  67                                         StringBuilder sb = new StringBuilder (len);
  68
  69                                         value.Position = 0;
  70                                         // Now read value into a byte buffer.
  71                                         byte [] bytes = null;
  72
  73                                         if (len < bufSize)
  74                                                 bufSize = len;
  75                                         bytes = new byte [bufSize];
  76
  77                                         while (len > 0) {
  78                                                 // Read may return anything from 0 to bufSize.
  79                                                 int n = value.Read(bytes, 0, bufSize);
  80                                                 sb.Append (Encoding.Unicode.GetString (bytes, 0, n));
  81
  82                                                 // The end of the file is reached.
  83                                                 if (n==0)
  84                                                     break;
  85                                                 len -= n;
  86                                         }
  87                                         xmlValue = sb.ToString ();
  88                                 }
  89                                 notNull = true;
  90                         }
  91                 }
  92
  93                 public SqlXml (XmlReader value)
  94                 {
  95                         if (value == null) {
  96                                 notNull = false;
  97                                 xmlValue = null;
  98                         } else {
  99                                 if (value.Read ()) {
 100                                         value.MoveToContent ();
 101                                         xmlValue = value.ReadOuterXml();
 102                                 } else
 103                                         xmlValue = String.Empty;
 104                                 notNull = true;
 105                         }
 106                 }
 107
 108                 public bool IsNull {
 109                         get { return !notNull; }
 110                 }
 111
 112                 public static SqlXml Null {
 113                         get {
 114                                 return new SqlXml ();
 115                         }
 116                 }
 117
 118                 public string Value {
 119                         get {
 120                                 if (notNull)
 121                                         return xmlValue;
 122                                 throw new SqlNullValueException ();
 123                         }
 124                 }
 125
 126                 public static XmlQualifiedName GetXsdType (XmlSchemaSet schemaSet)
 127                 {
 128                         XmlQualifiedName qualifiedName = new XmlQualifiedName ("anyType", "http://www.w3.org/2001/XMLSchema");
 129                         return qualifiedName;
 130                 }
 131
 132                 public XmlReader CreateReader ()
 133                 {
 134                         if (notNull) {
 135                                 XmlReaderSettings xs = new XmlReaderSettings ();
 136                                 xs.ConformanceLevel = ConformanceLevel.Fragment;
 137                                 return XmlTextReader.Create (new StringReader (xmlValue), xs);
 138                         } else
 139                                 throw new SqlNullValueException ();
 140                 }
 141
 142                 [MonoTODO]
 143                 XmlSchema IXmlSerializable.GetSchema ()
 144                 {
 145                         throw new NotImplementedException ();
 146                 }
 147
 148                 [MonoTODO]
 149                 void IXmlSerializable.ReadXml (XmlReader r)
 150                 {
 151                         throw new NotImplementedException ();
 152                 }
 153
 154                 [MonoTODO]
 155                 void IXmlSerializable.WriteXml (XmlWriter writer)
 156                 {
 157                         throw new NotImplementedException ();
 158                 }
 159         }
 160 }
 161