mcs/class/System.Data/System.Data/DataRowView.cs

   1 //
   2 // System.Data.DataRowView.cs
   3 //
   4 // Author:
   5 //    Rodrigo Moya <rodrigo@ximian.com>
   6 //    Miguel de Icaza <miguel@ximian.com>
   7 //    Daniel Morgan <danmorg@sc.rr.com>
   8 //
   9 // (C) Ximian, Inc 2002
  10 // (C) Daniel Morgan 2002
  11 //
  12
  13 //
  14 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System;
  37 using System.Collections;
  38 using System.ComponentModel;
  39 using System.Reflection;
  40
  41 namespace System.Data
  42 {
  43         /// <summary>
  44         /// Represents a customized view of a DataRow exposed as a fully featured Windows Forms control.
  45         /// </summary>
  46         public class DataRowView : ICustomTypeDescriptor, IEditableObject, IDataErrorInfo
  47         {
  48                 #region Fields
  49
  50                 DataView dataView;
  51                 DataRow dataRow;
  52                 DataRowVersion rowVersion = DataRowVersion.Current;
  53
  54                 bool isNew;
  55
  56                 #endregion // Fields
  57
  58                 #region Constructors
  59
  60                 internal DataRowView (DataView dataView, DataRow row) : this(dataView, row, false){
  61                 }
  62
  63                 internal DataRowView (DataView dataView, DataRow row, bool isNew) {
  64                         this.dataView = dataView;
  65                         this.dataRow = row;
  66                         this.isNew = isNew;
  67                 }
  68
  69                 #endregion // Constructors
  70
  71                 #region Methods
  72
  73                 public override bool Equals(object other)
  74                 {
  75                         return (other != null &&
  76                                         other is DataRowView &&
  77                                         ((DataRowView)other).dataRow != null &&
  78                                         ((DataRowView)other).dataRow.Equals(this.dataRow));
  79                 }
  80
  81                 public void BeginEdit ()
  82                 {
  83                         dataRow.BeginEdit ();
  84                 }
  85
  86                 public void CancelEdit ()
  87                 {
  88                         dataView.CancelEditRowView (this);
  89                         isNew = false;
  90                 }
  91
  92                 public DataView CreateChildView (DataRelation relation)
  93                 {
  94                         if (relation == null)
  95                                 throw new ArgumentException ("The relation is not parented to the table.");
  96                         return new DataView (relation.ChildTable);
  97                 }
  98
  99                 public DataView CreateChildView (string name)
 100                 {
 101                         return CreateChildView (
 102                                 dataRow.Table.ChildRelations [name]);
 103                 }
 104
 105                 public void Delete ()
 106                 {
 107                         dataView.DeleteRowView (this);
 108                         isNew = false;
 109                 }
 110
 111                 public void EndEdit ()
 112                 {
 113                         dataView.EndEditRowView (this);
 114                         isNew = false;
 115                 }
 116
 117                 #endregion // Methods
 118
 119                 #region Properties
 120
 121                 public DataView DataView {
 122                         get { return dataView; }
 123                 }
 124
 125                 public bool IsEdit {
 126                         get { return dataRow.IsEditing; }
 127                 }
 128
 129                 // It becomes true when this instance is created by
 130                 // DataView.AddNew(). If it is true, then the DataRow is
 131                 // "Detached", and when this.EndEdit() is invoked, the row
 132                 // will be added to the table.
 133                 public bool IsNew {
 134                         get { return isNew; }
 135                 }
 136
 137                 [System.Runtime.CompilerServices.IndexerName("Item")]
 138                 public object this[string column] {
 139                         get {
 140                                 DataColumn dc = dataView.Table.Columns[column];
 141                                 return dataRow[dc];
 142                         }
 143                         set {
 144                                 DataColumn dc = dataView.Table.Columns[column];
 145                                 dataRow[dc] = value;
 146                         }
 147                 }
 148
 149                 // the compiler creates a DefaultMemeberAttribute from
 150                 // this IndexerNameAttribute
 151                 public object this[int column] {
 152                         get {
 153                                 DataColumn dc = dataView.Table.Columns[column];
 154                                 return dataRow[dc];
 155                         }
 156                         set {
 157                                 DataColumn dc = dataView.Table.Columns[column];
 158                                 dataRow[dc] = value;
 159
 160                         }
 161                 }
 162
 163                 public DataRow Row {
 164                         get { return dataRow; }
 165                 }
 166
 167                 public DataRowVersion RowVersion {
 168                         [MonoTODO]
 169                         get {
 170                                 return rowVersion;
 171                         }
 172                 }
 173
 174                 // It returns the hash code of the DataRow object.
 175                 public override int GetHashCode ()
 176                 {
 177                         return dataRow.GetHashCode ();
 178                 }
 179
 180                 #endregion // Properties
 181
 182                 #region ICustomTypeDescriptor implementations
 183
 184                 [MonoTODO]
 185                 AttributeCollection ICustomTypeDescriptor.GetAttributes  ()
 186                 {
 187                         System.ComponentModel.AttributeCollection attributes;
 188                         attributes = AttributeCollection.Empty;
 189                         return attributes;
 190                 }
 191
 192                 [MonoTODO]
 193                 string ICustomTypeDescriptor.GetClassName ()
 194                 {
 195                         return "";
 196                 }
 197
 198                 [MonoTODO]
 199                 string ICustomTypeDescriptor.GetComponentName ()
 200                 {
 201                         return null;
 202                 }
 203
 204                 [MonoTODO]
 205                 TypeConverter ICustomTypeDescriptor.GetConverter ()
 206                 {
 207                         return null;
 208                 }
 209
 210                 [MonoTODO]
 211                 EventDescriptor ICustomTypeDescriptor.GetDefaultEvent ()
 212                 {
 213                         return null;
 214                 }
 215
 216                 [MonoTODO]
 217                 PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty ()
 218                 {
 219                         return null;
 220                 }
 221
 222                 [MonoTODO]
 223                 object ICustomTypeDescriptor.GetEditor (Type editorBaseType)
 224                 {
 225                         return null;
 226                 }
 227
 228                 [MonoTODO]
 229                 EventDescriptorCollection ICustomTypeDescriptor.GetEvents ()
 230                 {
 231                         return new EventDescriptorCollection(null);
 232                 }
 233
 234                 [MonoTODO]
 235                 EventDescriptorCollection ICustomTypeDescriptor.GetEvents (Attribute [] attributes)
 236                 {
 237                         return new EventDescriptorCollection(null);
 238                 }
 239
 240                 [MonoTODO]
 241                 PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties ()
 242                 {
 243                         ITypedList typedList = (ITypedList) dataView;
 244                         return typedList.GetItemProperties(new PropertyDescriptor[0]);
 245                 }
 246
 247                 [MonoTODO]
 248                 PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties (Attribute [] attributes)
 249                 {
 250                         PropertyDescriptorCollection descriptors;
 251                         descriptors = ((ICustomTypeDescriptor) this).GetProperties ();
 252                         // TODO: filter out descriptors which do not contain
 253                         //       any of those attributes
 254                         //       except, those descriptors
 255                         //       that contain DefaultMemeberAttribute
 256                         return descriptors;
 257                 }
 258
 259                 [MonoTODO]
 260                 object ICustomTypeDescriptor.GetPropertyOwner (PropertyDescriptor pd)
 261                 {
 262                         return this;
 263                 }
 264
 265                 #endregion // ICustomTypeDescriptor implementations
 266
 267                 #region IDataErrorInfo implementation
 268
 269                 string IDataErrorInfo.Error {
 270                         [MonoTODO]
 271                         get {
 272                                 return ""; // FIXME
 273                         }
 274                 }
 275
 276                 string IDataErrorInfo.this[string columnName] {
 277                         [MonoTODO]
 278                         get {
 279                                 return ""; // FIXME
 280                         }
 281                 }
 282
 283                 #endregion // IDataErrorInfo implementation
 284         }
 285 }