| | | 1 | | using System; |
| | | 2 | | using System.Linq.Expressions; |
| | | 3 | | using System.Reflection; |
| | | 4 | | using System.Text.Json; |
| | | 5 | | using System.Text.Json.Serialization; |
| | | 6 | | |
| | | 7 | | namespace SwiftCollections; |
| | | 8 | | |
| | | 9 | | public sealed class SwiftStateJsonConverterFactory : JsonConverterFactory |
| | | 10 | | { |
| | | 11 | | public override bool CanConvert(Type typeToConvert) |
| | 27 | 12 | | { |
| | 27 | 13 | | var stateProp = typeToConvert.GetProperty( |
| | 27 | 14 | | "State", |
| | 27 | 15 | | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); |
| | | 16 | | |
| | 27 | 17 | | return stateProp != null; |
| | 27 | 18 | | } |
| | | 19 | | |
| | | 20 | | public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options) |
| | 27 | 21 | | { |
| | 27 | 22 | | var stateProp = typeToConvert.GetProperty( |
| | 27 | 23 | | "State", |
| | 27 | 24 | | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); |
| | | 25 | | |
| | 27 | 26 | | Type stateType = stateProp.PropertyType; |
| | | 27 | | |
| | 27 | 28 | | var ctor = typeToConvert.GetConstructor(new[] { stateType }); |
| | | 29 | | |
| | 27 | 30 | | Type converterType = typeof(SwiftStateJsonConverter<,>) |
| | 27 | 31 | | .MakeGenericType(typeToConvert, stateType); |
| | | 32 | | |
| | | 33 | | // Build constructor delegate |
| | 27 | 34 | | var stateParam = Expression.Parameter(stateType); |
| | 27 | 35 | | var newExpr = Expression.New(ctor, stateParam); |
| | | 36 | | |
| | 27 | 37 | | var factoryLambda = Expression.Lambda( |
| | 27 | 38 | | typeof(Func<,>).MakeGenericType(stateType, typeToConvert), |
| | 27 | 39 | | newExpr, |
| | 27 | 40 | | stateParam); |
| | | 41 | | |
| | 27 | 42 | | var factoryDelegate = factoryLambda.Compile(); |
| | | 43 | | |
| | | 44 | | // Build state getter delegate |
| | 27 | 45 | | var collectionParam = Expression.Parameter(typeToConvert); |
| | | 46 | | |
| | 27 | 47 | | var getterExpr = Expression.Property(collectionParam, stateProp); |
| | | 48 | | |
| | 27 | 49 | | var getterLambda = Expression.Lambda( |
| | 27 | 50 | | typeof(Func<,>).MakeGenericType(typeToConvert, stateType), |
| | 27 | 51 | | getterExpr, |
| | 27 | 52 | | collectionParam); |
| | | 53 | | |
| | 27 | 54 | | var getterDelegate = getterLambda.Compile(); |
| | | 55 | | |
| | 27 | 56 | | return (JsonConverter)Activator.CreateInstance( |
| | 27 | 57 | | converterType, |
| | 27 | 58 | | factoryDelegate, |
| | 27 | 59 | | getterDelegate); |
| | 27 | 60 | | } |
| | | 61 | | } |