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 PropertyInfo prop = null;
  46                 private int columnIndex = 0;
  47
  48                 public DataColumnPropertyDescriptor (string name, int columnIndex, Attribute [] attrs)
  49                         : base (name, attrs)
  50                 {
  51                         this.columnIndex = columnIndex;
  52                 }
  53
  54                 public DataColumnPropertyDescriptor (DataColumn dc)
  55                         : base (dc.ColumnName, null)
  56                 {
  57                         this.columnIndex = dc.Ordinal;
  58                         this.componentType = typeof(DataRowView);
  59                         this.propertyType = dc.DataType;
  60                         this.readOnly = dc.ReadOnly;
  61                 }
  62
  63                 public void SetReadOnly (bool value)
  64                 {
  65                         readOnly = value;
  66                 }
  67
  68                 public void SetComponentType (Type type)
  69                 {
  70                         componentType = type;
  71                 }
  72
  73                 public void SetPropertyType (Type type)
  74                 {
  75                         propertyType = type;
  76                 }
  77
  78                 public override object GetValue (object component)
  79                 {
  80                         // FIXME: what is the correct way to Get a Value?
  81                         if(componentType == typeof(DataRowView) && component is DataRowView) {
  82                                 DataRowView drv = (DataRowView) component;
  83                                 return drv[base.Name];
  84                         }
  85                         else if(componentType == typeof(DbDataRecord) && component is DbDataRecord) {
  86                                 DbDataRecord dr = (DbDataRecord) component;
  87                                 return dr[columnIndex];
  88                         }
  89                         throw new InvalidOperationException();
  90
  91                         /*
  92                         if (prop == null)
  93                                 prop = GetPropertyInfo ();
  94
  95                         // FIXME: should I allow multiple parameters?
  96                         object[] parms = new object[1];
  97                         parms[0] = base.Name;
  98                         return prop.GetValue (component, parms);
  99                         */
 100                 }
 101
 102                 public override void SetValue(object component, object value)
 103                 {
 104                         DataRowView drv = (DataRowView) component;
 105                         drv[base.Name] = value;
 106                         /*
 107                         if (prop == null)
 108                                 prop = GetPropertyInfo ();
 109
 110                         if (readOnly == true) {
 111                                 // FIXME: what really happens if read only?
 112                                 throw new Exception("Property is ReadOnly");
 113                         }
 114
 115                         // FIXME: should I allow multiple parameters?
 116                         object[] parms = new Object[1];
 117                         parms[0] = base.Name;
 118                         prop.SetValue (component, value, parms);
 119                         */
 120                 }
 121
 122                 [MonoTODO]
 123                 public override void ResetValue(object component)
 124                 {
 125                         // FIXME:
 126                 }
 127
 128                 [MonoTODO]
 129                 public override bool CanResetValue(object component)
 130                 {
 131                         return false; // FIXEME
 132                 }
 133
 134                 [MonoTODO]
 135                 public override bool ShouldSerializeValue(object component)
 136                 {
 137                         return false;
 138                 }
 139
 140                 public override Type ComponentType {
 141                         get {
 142                                 return componentType;
 143                         }
 144                 }
 145
 146                 public override bool IsReadOnly {
 147                         get {
 148                                 return readOnly;
 149                         }
 150                 }
 151
 152                 public override Type PropertyType {
 153                         get {
 154                                 return propertyType;
 155                         }
 156                 }
 157         }
 158 }