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                                 dataRow.GetChildRows (relation));
  98                 }
  99
 100                 public DataView CreateChildView (string name)
 101                 {
 102                         return CreateChildView (
 103                                 dataRow.Table.ChildRelations [name]);
 104                 }
 105
 106                 public void Delete ()
 107                 {
 108                         dataView.DeleteRowView (this);
 109                         isNew = false;
 110                 }
 111
 112                 public void EndEdit ()
 113                 {
 114                         dataView.EndEditRowView (this);
 115                         isNew = false;
 116                 }
 117
 118                 #endregion // Methods
 119
 120                 #region Properties
 121
 122                 public DataView DataView {
 123                         get { return dataView; }
 124                 }
 125
 126                 public bool IsEdit {
 127                         get { return dataRow.IsEditing; }
 128                 }
 129
 130                 // It becomes true when this instance is created by
 131                 // DataView.AddNew(). If it is true, then the DataRow is
 132                 // "Detached", and when this.EndEdit() is invoked, the row
 133                 // will be added to the table.
 134                 public bool IsNew {
 135                         get { return isNew; }
 136                 }
 137
 138                 [System.Runtime.CompilerServices.IndexerName("Item")]
 139                 public object this[string column] {
 140                         get {
 141                                 DataColumn dc = dataView.Table.Columns[column];
 142                                 return dataRow[dc, GetActualRowVersion ()];
 143                         }
 144                         set {
 145                                 DataColumn dc = dataView.Table.Columns[column];
 146                                 dataRow[dc] = value;
 147                         }
 148                 }
 149
 150                 // the compiler creates a DefaultMemeberAttribute from
 151                 // this IndexerNameAttribute
 152                 public object this[int column] {
 153                         get {
 154                                 DataColumn dc = dataView.Table.Columns[column];
 155                                 return dataRow[dc, GetActualRowVersion ()];
 156                         }
 157                         set {
 158                                 DataColumn dc = dataView.Table.Columns[column];
 159                                 dataRow[dc] = value;
 160
 161                         }
 162                 }
 163
 164                 private DataRowVersion GetActualRowVersion ()
 165                 {
 166                         switch (dataView.RowStateFilter) {
 167                         case DataViewRowState.Added:
 168                                 return DataRowVersion.Proposed;
 169                         case DataViewRowState.ModifiedOriginal:
 170                         case DataViewRowState.Deleted:
 171                         case DataViewRowState.Unchanged:
 172                         case DataViewRowState.OriginalRows:
 173                                 return DataRowVersion.Original;
 174                         case DataViewRowState.ModifiedCurrent:
 175                                 return DataRowVersion.Current;
 176                         }
 177                         return DataRowVersion.Default;
 178                 }
 179
 180                 public DataRow Row {
 181                         get { return dataRow; }
 182                 }
 183
 184                 public DataRowVersion RowVersion {
 185                         [MonoTODO]
 186                         get {
 187                                 return rowVersion;
 188                         }
 189                 }
 190
 191                 // It returns the hash code of the DataRow object.
 192                 public override int GetHashCode ()
 193                 {
 194                         return dataRow.GetHashCode ();
 195                 }
 196
 197                 #endregion // Properties
 198
 199                 #region ICustomTypeDescriptor implementations
 200
 201                 [MonoTODO]
 202                 AttributeCollection ICustomTypeDescriptor.GetAttributes  ()
 203                 {
 204                         System.ComponentModel.AttributeCollection attributes;
 205                         attributes = AttributeCollection.Empty;
 206                         return attributes;
 207                 }
 208
 209                 [MonoTODO]
 210                 string ICustomTypeDescriptor.GetClassName ()
 211                 {
 212                         return "";
 213                 }
 214
 215                 [MonoTODO]
 216                 string ICustomTypeDescriptor.GetComponentName ()
 217                 {
 218                         return null;
 219                 }
 220
 221                 [MonoTODO]
 222                 TypeConverter ICustomTypeDescriptor.GetConverter ()
 223                 {
 224                         return null;
 225                 }
 226
 227                 [MonoTODO]
 228                 EventDescriptor ICustomTypeDescriptor.GetDefaultEvent ()
 229                 {
 230                         return null;
 231                 }
 232
 233                 [MonoTODO]
 234                 PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty ()
 235                 {
 236                         return null;
 237                 }
 238
 239                 [MonoTODO]
 240                 object ICustomTypeDescriptor.GetEditor (Type editorBaseType)
 241                 {
 242                         return null;
 243                 }
 244
 245                 [MonoTODO]
 246                 EventDescriptorCollection ICustomTypeDescriptor.GetEvents ()
 247                 {
 248                         return new EventDescriptorCollection(null);
 249                 }
 250
 251                 [MonoTODO]
 252                 EventDescriptorCollection ICustomTypeDescriptor.GetEvents (Attribute [] attributes)
 253                 {
 254                         return new EventDescriptorCollection(null);
 255                 }
 256
 257                 [MonoTODO]
 258                 PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties ()
 259                 {
 260                         ITypedList typedList = (ITypedList) dataView;
 261                         return typedList.GetItemProperties(new PropertyDescriptor[0]);
 262                 }
 263
 264                 [MonoTODO]
 265                 PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties (Attribute [] attributes)
 266                 {
 267                         PropertyDescriptorCollection descriptors;
 268                         descriptors = ((ICustomTypeDescriptor) this).GetProperties ();
 269                         // TODO: filter out descriptors which do not contain
 270                         //       any of those attributes
 271                         //       except, those descriptors
 272                         //       that contain DefaultMemeberAttribute
 273                         return descriptors;
 274                 }
 275
 276                 [MonoTODO]
 277                 object ICustomTypeDescriptor.GetPropertyOwner (PropertyDescriptor pd)
 278                 {
 279                         return this;
 280                 }
 281
 282                 #endregion // ICustomTypeDescriptor implementations
 283
 284                 #region IDataErrorInfo implementation
 285
 286                 string IDataErrorInfo.Error {
 287                         [MonoTODO]
 288                         get {
 289                                 return ""; // FIXME
 290                         }
 291                 }
 292
 293                 string IDataErrorInfo.this[string columnName] {
 294                         [MonoTODO]
 295                         get {
 296                                 return ""; // FIXME
 297                         }
 298                 }
 299
 300                 #endregion // IDataErrorInfo implementation
 301         }
 302 }