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 void SetReadOnly (bool value)
  55                 {
  56                         readOnly = value;
  57                 }
  58
  59                 public void SetComponentType (Type type)
  60                 {
  61                         componentType = type;
  62                 }
  63
  64                 public void SetPropertyType (Type type)
  65                 {
  66                         propertyType = type;
  67                 }
  68
  69                 private PropertyInfo GetPropertyInfo ()
  70                 {
  71                         string defaultMemberName = "";
  72                         object[] attribs = componentType.GetCustomAttributes (true);
  73
  74                         for (int at = 0; at < attribs.Length; at++) {
  75                                 if (attribs[at] is DefaultMemberAttribute) {
  76                                         defaultMemberName = ((DefaultMemberAttribute) attribs[at]).MemberName;
  77                                         break;
  78                                 }
  79                         }
  80
  81                         // FIXME: what do I do if a DefaultMemeberAttribute is not found?
  82                         //        should I try looking for DefaultPropertyAttribute?
  83                         if (defaultMemberName.Equals(""))
  84                                 throw new Exception("Default property not found.");
  85
  86                         Type[] parmTypes = new Type[1];
  87                         parmTypes[0] = propertyType;
  88                         PropertyInfo propertyInfo = componentType.GetProperty (defaultMemberName, parmTypes);
  89                         return propertyInfo;
  90                 }
  91
  92                 public override object GetValue (object component)
  93                 {
  94                         // FIXME: what is the correct way to Get a Value?
  95                         if(componentType == typeof(DataRowView) && component is DataRowView) {
  96                                 DataRowView drv = (DataRowView) component;
  97                                 return drv[base.Name];
  98                         }
  99                         else if(componentType == typeof(DbDataRecord) && component is DbDataRecord) {
 100                                 DbDataRecord dr = (DbDataRecord) component;
 101                                 return dr[columnIndex];
 102                         }
 103                         throw new InvalidOperationException();
 104
 105                         /*
 106                         if (prop == null)
 107                                 prop = GetPropertyInfo ();
 108
 109                         // FIXME: should I allow multiple parameters?
 110                         object[] parms = new object[1];
 111                         parms[0] = base.Name;
 112                         return prop.GetValue (component, parms);
 113                         */
 114                 }
 115
 116                 public override void SetValue(object component, object value)
 117                 {
 118                         DataRowView drv = (DataRowView) component;
 119                         drv[base.Name] = value;
 120                         /*
 121                         if (prop == null)
 122                                 prop = GetPropertyInfo ();
 123
 124                         if (readOnly == true) {
 125                                 // FIXME: what really happens if read only?
 126                                 throw new Exception("Property is ReadOnly");
 127                         }
 128
 129                         // FIXME: should I allow multiple parameters?
 130                         object[] parms = new Object[1];
 131                         parms[0] = base.Name;
 132                         prop.SetValue (component, value, parms);
 133                         */
 134                 }
 135
 136                 [MonoTODO]
 137                 public override void ResetValue(object component)
 138                 {
 139                         // FIXME:
 140                 }
 141
 142                 [MonoTODO]
 143                 public override bool CanResetValue(object component)
 144                 {
 145                         return false; // FIXEME
 146                 }
 147
 148                 [MonoTODO]
 149                 public override bool ShouldSerializeValue(object component)
 150                 {
 151                         return false;
 152                 }
 153
 154                 public override Type ComponentType {
 155                         get {
 156                                 return componentType;
 157                         }
 158                 }
 159
 160                 public override bool IsReadOnly {
 161                         get {
 162                                 return readOnly;
 163                         }
 164                 }
 165
 166                 public override Type PropertyType {
 167                         get {
 168                                 return propertyType;
 169                         }
 170                 }
 171         }
 172 }