mcs/class/System/System.Configuration/SettingsPropertyValue.cs

   1 //
   2 // System.Web.UI.WebControls.SettingsPropertyValue.cs
   3 //
   4 // Authors:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0
  30 using System;
  31 using System.Globalization;
  32 using System.IO;
  33 using System.ComponentModel;
  34 using System.Runtime.Serialization.Formatters.Binary;
  35 #if (XML_DEP)
  36 using System.Xml;
  37 using System.Xml.Serialization;
  38 #endif
  39
  40 namespace System.Configuration
  41 {
  42
  43         public class SettingsPropertyValue
  44         {
  45                 public SettingsPropertyValue (SettingsProperty property)
  46                 {
  47                         this.property = property;
  48                         needPropertyValue = true;
  49                 }
  50
  51                 public bool Deserialized {
  52                         get {
  53                                 return deserialized;
  54                         }
  55                         set {
  56                                 deserialized = value;
  57                         }
  58                 }
  59
  60                 public bool IsDirty {
  61                         get {
  62                                 return dirty;
  63                         }
  64                         set {
  65                                 dirty = value;
  66                         }
  67                 }
  68
  69                 public string Name {
  70                         get {
  71                                 return property.Name;
  72                         }
  73                 }
  74
  75                 public SettingsProperty Property {
  76                         get {
  77                                 return property;
  78                         }
  79                 }
  80
  81                 public object PropertyValue {
  82                         get {
  83                                 if (needPropertyValue) {
  84                                         propertyValue = GetDeserializedValue (serializedValue);
  85                                         if (propertyValue == null) {
  86                                                 propertyValue = GetDeserializedDefaultValue ();
  87                                                 defaulted = true;
  88                                         }
  89                                         needPropertyValue = false;
  90                                 }
  91
  92                                 if (propertyValue != null &&
  93                                         !(propertyValue is string) &&
  94                                         !(propertyValue is DateTime) &&
  95                                         !property.PropertyType.IsPrimitive)
  96                                         dirty = true;
  97
  98                                 return propertyValue;
  99                         }
 100                         set {
 101                                 propertyValue = value;
 102                                 dirty = true;
 103                                 needPropertyValue = false;
 104                                 needSerializedValue = true;
 105                                 defaulted = false;
 106                         }
 107                 }
 108
 109                 public object SerializedValue {
 110                         get {
 111                                 if (needSerializedValue) {
 112                                         needSerializedValue = false;
 113
 114                                         switch (property.SerializeAs)
 115                                         {
 116                                         case SettingsSerializeAs.String:
 117                                                 serializedValue = TypeDescriptor.GetConverter (property.PropertyType).ConvertToInvariantString (propertyValue);
 118                                                 break;
 119 #if (XML_DEP)
 120                                         case SettingsSerializeAs.Xml:
 121                                                 if (propertyValue != null) {
 122                                                         XmlSerializer serializer = new XmlSerializer (propertyValue.GetType ());
 123                                                         StringWriter w = new StringWriter(CultureInfo.InvariantCulture);
 124
 125                                                         serializer.Serialize (w, propertyValue);
 126                                                         serializedValue = w.ToString();
 127                                                 }
 128                                                 else
 129                                                         serializedValue = null;
 130                                                 break;
 131 #endif
 132                                         case SettingsSerializeAs.Binary:
 133                                                 if (propertyValue != null) {
 134                                                         BinaryFormatter bf = new BinaryFormatter ();
 135                                                         MemoryStream ms = new MemoryStream ();
 136                                                         bf.Serialize (ms, propertyValue);
 137                                                         serializedValue = ms.ToArray();
 138                                                 }
 139                                                 else
 140                                                         serializedValue = null;
 141                                                 break;
 142                                         default:
 143                                                 serializedValue = null;
 144                                                 break;
 145                                         }
 146
 147                                 }
 148
 149                                 return serializedValue;
 150                         }
 151                         set {
 152                                 serializedValue = value;
 153                                 needPropertyValue = true;
 154                         }
 155                 }
 156
 157                 public bool UsingDefaultValue {
 158                         get {
 159                                 return defaulted;
 160                         }
 161                 }
 162
 163                 internal object Reset ()
 164                 {
 165                         propertyValue = GetDeserializedDefaultValue ();
 166                         dirty = true;
 167                         defaulted = true;
 168                         needPropertyValue = true;
 169                         return propertyValue;
 170                 }
 171
 172                 private object GetDeserializedDefaultValue ()
 173                 {
 174                         if (property.DefaultValue == null)
 175                                 if (property.PropertyType.IsValueType)
 176                                         return Activator.CreateInstance (property.PropertyType);
 177                                 else
 178                                         return null;
 179
 180                         if (property.DefaultValue is string && ((string) property.DefaultValue).Length == 0)
 181                                 if (property.PropertyType != typeof (string))
 182                                         return Activator.CreateInstance (property.PropertyType);
 183                                 else
 184                                         return string.Empty;
 185
 186                         if (property.DefaultValue is string && ((string) property.DefaultValue).Length > 0)
 187                                 return GetDeserializedValue (property.DefaultValue);
 188
 189                         if (!property.PropertyType.IsAssignableFrom (property.DefaultValue.GetType ())) {
 190                                 TypeConverter converter = TypeDescriptor.GetConverter (property.PropertyType);
 191                                 return converter.ConvertFrom (null, CultureInfo.InvariantCulture, property.DefaultValue);
 192                         }
 193                         return property.DefaultValue;
 194                 }
 195
 196                 private object GetDeserializedValue (object serializedValue)
 197                 {
 198                         if (serializedValue == null)
 199                                 return null;
 200
 201                         object deserializedObject = null;
 202
 203                         try {
 204                                 switch (property.SerializeAs) {
 205                                         case SettingsSerializeAs.String:
 206                                                 if (serializedValue is string)
 207                                                         deserializedObject = TypeDescriptor.GetConverter (property.PropertyType).ConvertFromInvariantString ((string) serializedValue);
 208                                                 break;
 209 #if (XML_DEP)
 210                                         case SettingsSerializeAs.Xml:
 211                                                 XmlSerializer serializer = new XmlSerializer (property.PropertyType);
 212                                                 StringReader str = new StringReader ((string) serializedValue);
 213                                                 deserializedObject = serializer.Deserialize (XmlReader.Create (str));
 214                                                 break;
 215 #endif
 216                                         case SettingsSerializeAs.Binary:
 217                                                 BinaryFormatter bf = new BinaryFormatter ();
 218                                                 MemoryStream ms;
 219                                                 if (serializedValue is string)
 220                                                         ms = new MemoryStream (Convert.FromBase64String ((string) serializedValue));
 221                                                 else
 222                                                         ms = new MemoryStream ((byte []) serializedValue);
 223                                                 deserializedObject = bf.Deserialize (ms);
 224                                                 break;
 225                                 }
 226                         }
 227                         catch (Exception e) {
 228                                 if (property.ThrowOnErrorDeserializing)
 229                                         throw e;
 230                         }
 231
 232                         return deserializedObject;
 233                 }
 234
 235                 readonly SettingsProperty property;
 236                 object propertyValue;
 237                 object serializedValue;
 238                 bool needSerializedValue;
 239                 bool needPropertyValue;
 240                 bool dirty;
 241                 bool defaulted = false;
 242                 bool deserialized;
 243         }
 244
 245 }
 246
 247 #endif