77using System ;
88using System . Collections . Generic ;
99using System . Linq ;
10+ using System . Runtime . Serialization ;
1011
1112namespace Hocon
1213{
@@ -16,8 +17,35 @@ namespace Hocon
1617 /// the internal representation of a HOCON (Human-Optimized Config Object Notation)
1718 /// configuration string.
1819 /// </summary>
19- public class Config : HoconRoot
20+ [ Serializable ]
21+ public class Config : HoconRoot , ISerializable
2022 {
23+ /// <summary>
24+ /// INTERNAL API
25+ ///
26+ /// Special case for empty configurations. Immutable and can't be added as a fallback.
27+ /// </summary>
28+ internal sealed class EmptyConfig : Config
29+ {
30+ public static EmptyConfig Instance = new EmptyConfig ( ) ;
31+
32+ private EmptyConfig ( ) : base ( new HoconRoot ( new HoconEmptyValue ( null ) ) )
33+ {
34+ }
35+
36+ protected override Config Copy ( Config fallback = null )
37+ {
38+ return Instance ;
39+ }
40+
41+ public override Config WithFallback ( Config fallback )
42+ {
43+ return fallback ;
44+ }
45+ }
46+
47+ public const string SerializedPropertyName = "_dump" ;
48+
2149 [ Obsolete ( "For json serialization/deserialization only" , true ) ]
2250 private Config ( )
2351 {
@@ -89,10 +117,10 @@ public string ToString(bool useFallbackValues)
89117 /// Generates a deep clone of the current configuration.
90118 /// </summary>
91119 /// <returns>A deep clone of the current configuration</returns>
92- protected Config Copy ( )
120+ protected virtual Config Copy ( Config fallback = null )
93121 {
94122 //deep clone
95- return new Config ( ( HoconValue ) Value . Clone ( null ) , Fallback ? . Copy ( ) ) ;
123+ return new Config ( ( HoconValue ) Value . Clone ( null ) , fallback ? . Copy ( ) ?? Fallback ? . Copy ( ) ) ;
96124 }
97125
98126 protected override HoconValue GetNode ( HoconPath path , bool throwIfNotFound = false )
@@ -137,10 +165,13 @@ public virtual Config WithFallback(Config fallback)
137165 {
138166 if ( fallback == this )
139167 throw new ArgumentException ( "Config can not have itself as fallback" , nameof ( fallback ) ) ;
168+
169+ if ( fallback == Config . Empty )
170+ return this ; // no-op
140171
141172 // If Fallback is not set - we will set it in new copy
142173 // If Fallback was set - just use it, but with adding new fallback values
143- return new Config ( ( HoconValue ) Value . Clone ( null ) , Fallback ? . WithFallback ( fallback ) ?? fallback ) ;
174+ return Copy ( Fallback . SafeWithFallback ( fallback ) ) ;
144175 }
145176
146177 /// <summary>
@@ -206,6 +237,23 @@ private HoconValue GetRootValue()
206237
207238 return aggregated ;
208239 }
240+
241+ /// <inheritdoc />
242+ public void GetObjectData ( SerializationInfo info , StreamingContext context )
243+ {
244+ info . AddValue ( SerializedPropertyName , this . ToString ( useFallbackValues : true ) , typeof ( string ) ) ;
245+ }
246+
247+ [ Obsolete ( "Used for serialization only" , true ) ]
248+ public Config ( SerializationInfo info , StreamingContext context )
249+ {
250+ var config = ConfigurationFactory . ParseString ( info . GetValue ( SerializedPropertyName , typeof ( string ) ) as string ) ;
251+
252+ Value = config . Value ;
253+ Fallback = config . Fallback ;
254+
255+ Root = GetRootValue ( ) ;
256+ }
209257 }
210258
211259 /// <summary>
0 commit comments