mcs/class/System.Data/System.Data/DataColumnPropertyDescriptor.cs

   1 //
   2 // System.Data.DataColumnPropertyDescriptor.cs
   3 //
   4 // Author:
   5 //   Daniel Morgan <danmorg@sc.rr.com>
   6 //
   7 // (c) copyright 2002 Daniel Morgan
   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 using System;
  34 using System.Data.Common;
  35 using System.ComponentModel;
  36 using System.Reflection;
  37
  38 namespace System.Data
  39 {
  40         internal class DataColumnPropertyDescriptor : PropertyDescriptor
  41         {
  42                 private bool readOnly = true;
  43                 private Type componentType = null;
  44                 private Type propertyType = null;
  45                 private bool browsable = true;
  46
  47                 //private PropertyInfo prop = null;
  48                 private int columnIndex = 0;
  49
  50                 public DataColumnPropertyDescriptor (string name, int columnIndex, Attribute [] attrs)
  51                         : base (name, attrs)
  52                 {
  53                         this.columnIndex = columnIndex;
  54                 }
  55
  56                 public DataColumnPropertyDescriptor (DataColumn dc)
  57                         : base (dc.ColumnName, null)
  58                 {
  59                         this.columnIndex = dc.Ordinal;
  60                         this.componentType = typeof(DataRowView);
  61                         this.propertyType = dc.DataType;
  62                         this.readOnly = dc.ReadOnly;
  63                 }
  64
  65                 public void SetReadOnly (bool value)
  66                 {
  67                         readOnly = value;
  68                 }
  69
  70                 public void SetComponentType (Type type)
  71                 {
  72                         componentType = type;
  73                 }
  74
  75                 public void SetPropertyType (Type type)
  76                 {
  77                         propertyType = type;
  78                 }
  79
  80                 public void SetBrowsable (bool browsable)
  81                 {
  82                         this.browsable = browsable;
  83                 }
  84
  85                 public override object GetValue (object component)
  86                 {
  87                         // FIXME: what is the correct way to Get a Value?
  88                         if(componentType == typeof(DataRowView) && component is DataRowView) {
  89                                 DataRowView drv = (DataRowView) component;
  90                                 return drv[base.Name];
  91                         }
  92                         else if(componentType == typeof(DbDataRecord) && component is DbDataRecord) {
  93                                 DbDataRecord dr = (DbDataRecord) component;
  94                                 return dr[columnIndex];
  95                         }
  96                         throw new InvalidOperationException();
  97
  98                         /*
  99                         if (prop == null)
 100                                 prop = GetPropertyInfo ();
 101
 102                         // FIXME: should I allow multiple parameters?
 103                         object[] parms = new object[1];
 104                         parms[0] = base.Name;
 105                         return prop.GetValue (component, parms);
 106                         */
 107                 }
 108
 109                 public override void SetValue(object component, object value)
 110                 {
 111                         DataRowView drv = (DataRowView) component;
 112                         drv[base.Name] = value;
 113                         /*
 114                         if (prop == null)
 115                                 prop = GetPropertyInfo ();
 116
 117                         if (readOnly == true) {
 118                                 // FIXME: what really happens if read only?
 119                                 throw new Exception("Property is ReadOnly");
 120                         }
 121
 122                         // FIXME: should I allow multiple parameters?
 123                         object[] parms = new Object[1];
 124                         parms[0] = base.Name;
 125                         prop.SetValue (component, value, parms);
 126                         */
 127                 }
 128
 129                 [MonoTODO]
 130                 public override void ResetValue(object component)
 131                 {
 132                         // FIXME:
 133                 }
 134
 135                 [MonoTODO]
 136                 public override bool CanResetValue(object component)
 137                 {
 138                         return false; // FIXEME
 139                 }
 140
 141                 [MonoTODO]
 142                 public override bool ShouldSerializeValue(object component)
 143                 {
 144                         return false;
 145                 }
 146
 147                 public override Type ComponentType {
 148                         get {
 149                                 return componentType;
 150                         }
 151                 }
 152
 153                 public override bool IsReadOnly {
 154                         get {
 155                                 return readOnly;
 156                         }
 157                 }
 158
 159                 public override bool IsBrowsable {
 160                         get { return browsable && base.IsBrowsable; }
 161                 }
 162
 163                 public override Type PropertyType {
 164                         get {
 165                                 return propertyType;
 166                         }
 167                 }
 168         }
 169 }