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

   1 //
   2 // System.Data.SqlTypes.SqlChars
   3 //
   4 // Author:
   5 //   Tim Coleman <tim@timcoleman.com>
   6 //
   7 // Copyright (C) Tim Coleman, 2003
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 #if NET_2_0
  34
  35 using System;
  36 using System.Globalization;
  37 using System.Xml;
  38 using System.Text;
  39 using System.Xml.Schema;
  40 using System.Xml.Serialization;
  41 using System.Runtime.Serialization;
  42
  43 namespace System.Data.SqlTypes
  44 {
  45         [SerializableAttribute]
  46         [XmlSchemaProvider ("GetXsdType")]
  47         [XmlRootAttribute ("string")]
  48         public sealed class SqlChars : INullable, IXmlSerializable, ISerializable
  49         {
  50                 #region Fields
  51
  52                 bool notNull;
  53                 char [] buffer;
  54                 StorageState storage = StorageState.UnmanagedBuffer;
  55
  56                 #endregion
  57
  58                 #region Constructors
  59
  60                 public SqlChars ()
  61                 {
  62                         notNull = false;
  63                         buffer = null;
  64                 }
  65
  66                 public SqlChars (char[] buffer)
  67                 {
  68                         if (buffer == null) {
  69                                 notNull = false;
  70                                 this.buffer = null;
  71                         } else {
  72                                 notNull = true;
  73                                 this.buffer = buffer;
  74                                 storage = StorageState.Buffer;
  75                         }
  76                 }
  77
  78                 public SqlChars (SqlString value)
  79                 {
  80                         if (value.IsNull) {
  81                                 notNull = false;
  82                                 buffer = null;
  83                         } else {
  84                                 notNull = true;
  85                                 buffer = value.Value.ToCharArray ();
  86                                 storage = StorageState.Buffer;
  87                         }
  88                 }
  89
  90                 #endregion
  91
  92                 #region Properties
  93
  94                 public char [] Buffer {
  95                         get { return buffer; }
  96                 }
  97
  98                 public bool IsNull {
  99                         get { return !notNull; }
 100                 }
 101
 102                 public char this [long offset] {
 103                         set {
 104                                 if (notNull && offset >= 0 && offset < buffer.Length)
 105                                         buffer [offset] = value;
 106                         }
 107                         get {
 108                                 if (buffer == null)
 109                                         throw new SqlNullValueException ("Data is Null");
 110                                 if (offset < 0 || offset >= buffer.Length)
 111                                         throw new ArgumentOutOfRangeException ("Parameter name: offset");
 112                                 return buffer [offset];
 113                         }
 114                 }
 115
 116                 public long Length {
 117                         get {
 118                                 if (!notNull || buffer == null)
 119                                         throw new SqlNullValueException ("Data is Null");
 120                                 if (buffer.Length < 0)
 121                                         return -1;
 122                                 return buffer.Length;
 123                         }
 124                 }
 125
 126                 public long MaxLength {
 127                         get {
 128                                 if (!notNull || buffer == null || storage == StorageState.Stream)
 129                                         return -1;
 130                                 return buffer.Length;
 131                         }
 132                 }
 133
 134                 public static SqlChars Null {
 135                         get {
 136                                 return new SqlChars ();
 137                         }
 138                 }
 139
 140                 public StorageState Storage {
 141                         get {
 142                                 if (storage == StorageState.UnmanagedBuffer)
 143                                         throw new SqlNullValueException ("Data is Null");
 144                                 return storage;
 145                         }
 146                 }
 147
 148                 public char [] Value {
 149                         get {
 150                                 if (buffer == null)
 151                                         return buffer;
 152                                 return (char []) buffer.Clone ();
 153                         }
 154                 }
 155
 156                 #endregion
 157
 158                 #region Methods
 159
 160                 public void SetLength (long value)
 161                 {
 162                         if (buffer == null)
 163                                 throw new SqlTypeException ("There is no buffer");
 164                         if (value < 0 || value > buffer.Length)
 165                                 throw new ArgumentOutOfRangeException ("Specified argument was out of the range of valid values.");
 166                         Array.Resize (ref buffer, (int) value);
 167                 }
 168
 169                 public void SetNull ()
 170                 {
 171                         buffer = null;
 172                         notNull = false;
 173                 }
 174
 175                 public static explicit operator SqlString (SqlChars x)
 176                 {
 177                         if (x.IsNull)
 178                                 return SqlString.Null;
 179                         else {
 180                                 return new SqlString (new String (x.Value));
 181                         }
 182                 }
 183
 184                 public static explicit operator SqlChars (SqlString x)
 185                 {
 186                         if (x.IsNull)
 187                                 return Null;
 188                         else
 189                                 return new SqlChars (x.Value);
 190                 }
 191
 192                 public SqlString ToSqlString ()
 193                 {
 194                         if (buffer == null) {
 195                                 return SqlString.Null;
 196                         }
 197                         else {
 198                                 return new SqlString (buffer.ToString ());
 199                         }
 200                 }
 201
 202                 [MonoTODO]
 203                 public long Read (long offset, char [] buffer, int offsetInBuffer, int count)
 204                 {
 205                         throw new NotImplementedException ();
 206                 }
 207
 208                 [MonoNotSupported("")]
 209                 public void Write (long offset, char [] buffer, int offsetInBuffer, int count)
 210                 {
 211                         throw new NotImplementedException ();
 212                 }
 213
 214                 public static XmlQualifiedName GetXsdType (XmlSchemaSet schemaSet)
 215                 {
 216                         XmlQualifiedName qualifiedName = new XmlQualifiedName ("string", "http://www.w3.org/2001/XMLSchema");
 217                         return qualifiedName;
 218                 }
 219
 220                 [MonoTODO]
 221                 XmlSchema IXmlSerializable.GetSchema ()
 222                 {
 223                         throw new NotImplementedException ();
 224                 }
 225
 226                 void IXmlSerializable.ReadXml (XmlReader reader)
 227                 {
 228                         if (reader == null)
 229                                 return;
 230
 231                         switch (reader.ReadState) {
 232                         case ReadState.EndOfFile:
 233                         case ReadState.Error:
 234                         case ReadState.Closed:
 235                                 return;
 236                         }
 237                         // Skip XML declaration and prolog
 238                         // or do I need to validate for the <string> tag?
 239                         reader.MoveToContent ();
 240                         if (reader.EOF)
 241                                 return;
 242
 243                         reader.Read ();
 244                         if (reader.NodeType == XmlNodeType.EndElement)
 245                                 return;
 246
 247                         if (reader.Value.Length > 0) {
 248                                 if (String.Compare ("Null", reader.Value) == 0) {
 249                                         // means a null reference/invalid value
 250                                         notNull = false;
 251                                         return;
 252                                 }
 253                                 // FIXME: Validate the value for expected format
 254                                 this.buffer = reader.Value.ToCharArray ();
 255                                 this.notNull = true;
 256                                 this.storage = StorageState.Buffer;
 257                         }
 258                 }
 259
 260                 void IXmlSerializable.WriteXml (XmlWriter writer)
 261                 {
 262                         writer.WriteString (this.buffer.ToString ());
 263                 }
 264
 265                 [MonoTODO]
 266                 void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
 267                 {
 268                         throw new NotImplementedException ();
 269                 }
 270
 271                 #endregion
 272         }
 273 }
 274
 275 #endif