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 using System;
  30 using System.Globalization;
  31 using System.IO;
  32 using System.ComponentModel;
  33 using System.Runtime.Serialization.Formatters.Binary;
  34 #if (XML_DEP)
  35 using System.Xml;
  36 using System.Xml.Serialization;
  37 #endif
  38
  39 namespace System.Configuration
  40 {
  41
  42         public class SettingsPropertyValue
  43         {
  44                 public SettingsPropertyValue (SettingsProperty property)
  45                 {
  46                         this.property = property;
  47                         needPropertyValue = true;
  48                 }
  49
  50                 public bool Deserialized {
  51                         get {
  52                                 return deserialized;
  53                         }
  54                         set {
  55                                 deserialized = value;
  56                         }
  57                 }
  58
  59                 public bool IsDirty {
  60                         get {
  61                                 return dirty;
  62                         }
  63                         set {
  64                                 dirty = value;
  65                         }
  66                 }
  67
  68                 public string Name {
  69                         get {
  70                                 return property.Name;
  71                         }
  72                 }
  73
  74                 public SettingsProperty Property {
  75                         get {
  76                                 return property;
  77                         }
  78                 }
  79
  80                 public object PropertyValue {
  81                         get {
  82                                 if (needPropertyValue) {
  83                                         propertyValue = GetDeserializedValue (serializedValue);
  84                                         if (propertyValue == null) {
  85                                                 propertyValue = GetDeserializedDefaultValue ();
  86                                                 defaulted = true;
  87                                         }
  88                                         needPropertyValue = false;
  89                                 }
  90
  91                                 if (propertyValue != null &&
  92                                         !(propertyValue is string) &&
  93                                         !(propertyValue is DateTime) &&
  94                                         !property.PropertyType.IsPrimitive)
  95                                         dirty = true;
  96
  97                                 return propertyValue;
  98                         }
  99                         set {
 100                                 propertyValue = value;
 101                                 dirty = true;
 102                                 needPropertyValue = false;
 103                                 needSerializedValue = true;
 104                                 defaulted = false;
 105                         }
 106                 }
 107
 108                 public object SerializedValue {
 109                         get {
 110                                 if (needSerializedValue) {
 111                                         needSerializedValue = false;
 112
 113                                         switch (property.SerializeAs)
 114                                         {
 115                                         case SettingsSerializeAs.String:
 116                                                 serializedValue = TypeDescriptor.GetConverter (property.PropertyType).ConvertToInvariantString (propertyValue);
 117                                                 break;
 118 #if (XML_DEP)
 119                                         case SettingsSerializeAs.Xml:
 120                                                 if (propertyValue != null) {
 121                                                         XmlSerializer serializer = new XmlSerializer (propertyValue.GetType ());
 122                                                         StringWriter w = new StringWriter(CultureInfo.InvariantCulture);
 123
 124                                                         serializer.Serialize (w, propertyValue);
 125                                                         serializedValue = w.ToString();
 126                                                 }
 127                                                 else
 128                                                         serializedValue = null;
 129                                                 break;
 130 #endif
 131                                         case SettingsSerializeAs.Binary:
 132                                                 if (propertyValue != null) {
 133                                                         BinaryFormatter bf = new BinaryFormatter ();
 134                                                         MemoryStream ms = new MemoryStream ();
 135                                                         bf.Serialize (ms, propertyValue);
 136                                                         serializedValue = ms.ToArray();
 137                                                 }
 138                                                 else
 139                                                         serializedValue = null;
 140                                                 break;
 141                                         default:
 142                                                 serializedValue = null;
 143                                                 break;
 144                                         }
 145
 146                                 }
 147
 148                                 return serializedValue;
 149                         }
 150                         set {
 151                                 serializedValue = value;
 152                                 needPropertyValue = true;
 153                         }
 154                 }
 155
 156                 public bool UsingDefaultValue {
 157                         get {
 158                                 return defaulted;
 159                         }
 160                 }
 161
 162                 internal object Reset ()
 163                 {
 164                         propertyValue = GetDeserializedDefaultValue ();
 165                         dirty = true;
 166                         defaulted = true;
 167                         needPropertyValue = true;
 168                         return propertyValue;
 169                 }
 170
 171                 private object GetDeserializedDefaultValue ()
 172                 {
 173                         if (property.DefaultValue == null)
 174                                 if (property.PropertyType.IsValueType)
 175                                         return Activator.CreateInstance (property.PropertyType);
 176                                 else
 177                                         return null;
 178
 179                         if (property.DefaultValue is string && ((string) property.DefaultValue).Length == 0)
 180                                 if (property.PropertyType != typeof (string))
 181                                         return Activator.CreateInstance (property.PropertyType);
 182                                 else
 183                                         return string.Empty;
 184
 185                         if (property.DefaultValue is string && ((string) property.DefaultValue).Length > 0)
 186                                 return GetDeserializedValue (property.DefaultValue);
 187
 188                         if (!property.PropertyType.IsAssignableFrom (property.DefaultValue.GetType ())) {
 189                                 TypeConverter converter = TypeDescriptor.GetConverter (property.PropertyType);
 190                                 return converter.ConvertFrom (null, CultureInfo.InvariantCulture, property.DefaultValue);
 191                         }
 192                         return property.DefaultValue;
 193                 }
 194
 195                 private object GetDeserializedValue (object serializedValue)
 196                 {
 197                         if (serializedValue == null)
 198                                 return null;
 199
 200                         object deserializedObject = null;
 201
 202                         try {
 203                                 switch (property.SerializeAs) {
 204                                         case SettingsSerializeAs.String:
 205                                                 if (serializedValue is string)
 206                                                         deserializedObject = TypeDescriptor.GetConverter (property.PropertyType).ConvertFromInvariantString ((string) serializedValue);
 207                                                 break;
 208 #if (XML_DEP)
 209                                         case SettingsSerializeAs.Xml:
 210                                                 XmlSerializer serializer = new XmlSerializer (property.PropertyType);
 211                                                 StringReader str = new StringReader ((string) serializedValue);
 212                                                 deserializedObject = serializer.Deserialize (XmlReader.Create (str));
 213                                                 break;
 214 #endif
 215                                         case SettingsSerializeAs.Binary:
 216                                                 BinaryFormatter bf = new BinaryFormatter ();
 217                                                 MemoryStream ms;
 218                                                 if (serializedValue is string)
 219                                                         ms = new MemoryStream (Convert.FromBase64String ((string) serializedValue));
 220                                                 else
 221                                                         ms = new MemoryStream ((byte []) serializedValue);
 222                                                 deserializedObject = bf.Deserialize (ms);
 223                                                 break;
 224                                 }
 225                         }
 226                         catch (Exception e) {
 227                                 if (property.ThrowOnErrorDeserializing)
 228                                         throw e;
 229                         }
 230
 231                         return deserializedObject;
 232                 }
 233
 234                 readonly SettingsProperty property;
 235                 object propertyValue;
 236                 object serializedValue;
 237                 bool needSerializedValue;
 238                 bool needPropertyValue;
 239                 bool dirty;
 240                 bool defaulted = false;
 241                 bool deserialized;
 242         }
 243
 244 }
 245