private JsonMapsCache GetInfoFromTypeCached(Type objectType)
{
JsonMapsCache data;
lock (this.dicTypeData)
if (!this.dicTypeData.TryGetValue(objectType, out data))
{
JsonMapBase[] listOfMappers = this.jsonMapsTree.GetMappers(objectType).ToArray();
JsonMapBase[][] subMappers = this.jsonMapsTree.GetSubpathes(objectType).ToArray();
if (listOfMappers.Length == 0 && subMappers.Length == 0)
{
this.dicTypeData[objectType] = null;
}
else
{
this.dicTypeData[objectType] = data = new JsonMapsCache {
Mappers = listOfMappers, SubMappers = subMappers
}
};
return(data);
}
else
{
return(data);
}
}
public override bool CanConvert(Type objectType)
{
if (this.blockOnce == 1)
{
this.blockOnce = 0;
return(false);
}
// the question here is: is this objectType associated with any class hierarchy in the `JsonMap` list?
JsonMapsCache cachedData = this.GetInfoFromTypeCached(objectType);
return(cachedData != null);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
// the question here is: is this objectType associated with any class hierarchy in the `JsonMap` list?
JsonMapsCache cachedData = this.GetInfoFromTypeCached(objectType);
while (this.blockOnce == 1)
{
throw new Exception("Writing is blocked but should not.");
}
if (reader.TokenType == JsonToken.Null)
{
bool isNullable = Nullable.GetUnderlyingType(objectType) != null || !objectType.GetTypeInfo().IsValueType;
if (isNullable)
{
return(null);
}
}
JObject jo = JObject.Load(reader);
object?value = reader.Value;
// Looking for discriminators:
// - match the discriminators of the type given by `objectType`
// - match the discriminators of subtypes of `objectType`
// STEP 1: match the discriminators of the type given by `objectType`
string discriminatorFieldValue = null;
bool foundBaseIAndSubtypes = false;
JsonMapBase classMapToUse = null;
foreach (JsonMapBase jsonMapBase in cachedData.Mappers.Reverse())
{
if (foundBaseIAndSubtypes)
{
throw new Exception($"IAndSubtypes mapper does not accept child mappers.");
}
if (jsonMapBase is IAndSubtypes)
{
if (jsonMapBase.DiscriminatorFieldName != null)
{
JToken?discriminatorFieldValueToken = jo[jsonMapBase.DiscriminatorFieldName];
if (discriminatorFieldValueToken?.Type == JTokenType.String)
{
discriminatorFieldValue = discriminatorFieldValueToken.Value <string>();
}
}
foundBaseIAndSubtypes = true;
var jsonMapWithSubtypes = jsonMapBase as IAndSubtypes;
value = jsonMapWithSubtypes.CreateObject(discriminatorFieldValue);
serializer.Populate(jo.CreateReader(), value);
discriminatorFieldValue = null;
}
else
{
var jsonSubclassMap = jsonMapBase as JsonSubclassMap;
if (jsonSubclassMap?.DiscriminatorFieldValue != null && discriminatorFieldValue != null)
{
if (jsonSubclassMap.DiscriminatorFieldValue != discriminatorFieldValue)
{
throw new Exception($"Discriminator does not match.");
}
discriminatorFieldValue = null;
}
if (jsonMapBase.DiscriminatorFieldName != null)
{
JToken?discriminatorFieldValueToken = jo[jsonMapBase.DiscriminatorFieldName];
if (discriminatorFieldValueToken?.Type == JTokenType.String)
{
discriminatorFieldValue = discriminatorFieldValueToken.Value <string>();
}
}
classMapToUse = jsonMapBase;
}
}
// STEP 2: match the discriminators of subtypes of `objectType`
JsonMapBase subclassMapToUse = null;
foreach (JsonMapBase[] jsonSubmappers in cachedData.SubMappers)
{
string subDiscriminatorFieldValue = discriminatorFieldValue;
bool foundSubIAndSubtypes = foundBaseIAndSubtypes;
JsonMapBase subclassMapToUse2 = null;
foreach (JsonMapBase submapper in jsonSubmappers.Reverse())
{
if (foundSubIAndSubtypes)
{
throw new Exception($"IAndSubtypes mapper does not accept child mappers.");
}
if (submapper is IAndSubtypes)
{
if (submapper.DiscriminatorFieldName != null)
{
JToken?discriminatorFieldValueToken = jo[submapper.DiscriminatorFieldName];
if (discriminatorFieldValueToken?.Type == JTokenType.String)
{
subDiscriminatorFieldValue = discriminatorFieldValueToken.Value <string>();
}
if (subDiscriminatorFieldValue == null)
{
throw new Exception($"Discriminator field not found.");
}
}
foundSubIAndSubtypes = true;
var jsonMapWithSubtypes = submapper as IAndSubtypes;
value = jsonMapWithSubtypes.CreateObject(subDiscriminatorFieldValue);
serializer.Populate(jo.CreateReader(), value);
subDiscriminatorFieldValue = null;
}
else
{
var jsonSubclassMap = submapper as JsonSubclassMap;
if (jsonSubclassMap != null)
{
if (jsonSubclassMap.DiscriminatorFieldValue != null)
{
if (jsonSubclassMap.DiscriminatorFieldValue != subDiscriminatorFieldValue)
{
break;
}
if (subclassMapToUse != null)
{
throw new Exception($"Ambiguous maps for the type `{submapper.SerializedType.Name}`");
}
subDiscriminatorFieldValue = null;
subclassMapToUse2 = jsonSubclassMap;
}
}
else
{
if (cachedData.Mappers.Length > 0)
{
throw new Exception($"Sub mappers must be subclasses of `{typeof(JsonSubclassMap).Name}`: `{cachedData.Mappers[0].GetType().Name}`");
}
if (subclassMapToUse != null)
{
throw new Exception($"Ambiguous maps for the type `{submapper.SerializedType.Name}`");
}
subclassMapToUse2 = submapper;
}
if (submapper.DiscriminatorFieldName != null)
{
JToken?discriminatorFieldValueToken = jo[submapper.DiscriminatorFieldName];
if (discriminatorFieldValueToken?.Type == JTokenType.String)
{
subDiscriminatorFieldValue = discriminatorFieldValueToken.Value <string>();
}
if (subDiscriminatorFieldValue == null)
{
break;
}
}
}
}
if (subclassMapToUse2 != null)
{
subclassMapToUse = subclassMapToUse2;
}
if (subclassMapToUse2 != null && subDiscriminatorFieldValue != null)
{
throw new Exception("Value of discriminator field not verified by any subclass map.");
}
}
if (subclassMapToUse == null && discriminatorFieldValue != null)
{
throw new Exception("Value of discriminator field not verified by any subclass map.");
}
// STEP 3: Creating the new value with the correct JsonMapBase class if any
// - by the way, there is no JsonMapBase when a IAndSubtypes mapper is found
JsonMapBase classMapToUse2 = subclassMapToUse ?? classMapToUse;
if (classMapToUse2 != null)
{
if (!classMapToUse2.CanCreateNew())
{
throw new Exception($"Cannot create object of type `{classMapToUse2.SerializedType}`");
}
value = classMapToUse2.CreateNew();
serializer.Populate(jo.CreateReader(), value);
}
return(value);
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Type objectType = value?.GetType();
JsonMapsCache cachedData = this.GetInfoFromTypeCached(objectType);
while (this.blockOnce == 1)
{
throw new Exception("Writing is blocked but should not.");
}
this.blockOnce = 1;
JObject jo = JObject.FromObject(value);
// finding discriminator field names
string discriminatorFieldValue = null;
foreach (JsonMapBase jsonMapBase in cachedData.Mappers)
{
if (jsonMapBase is IAndSubtypes)
{
if (cachedData.Mappers.Length > 1)
{
throw new Exception("Json mapper of type `IAndSubtypes` cannot be combined with other mappers.");
}
var jsonMapWithSubtypes = jsonMapBase as IAndSubtypes;
discriminatorFieldValue = jsonMapWithSubtypes.DiscriminatorFieldValueGetter != null
? jsonMapWithSubtypes.DiscriminatorFieldValueGetter(value.GetType())
: value.GetType().AssemblyQualifiedName;
jo.Add(jsonMapBase.DiscriminatorFieldName, discriminatorFieldValue);
discriminatorFieldValue = null;
}
else
{
if (jsonMapBase.DiscriminatorFieldName != null)
{
if (discriminatorFieldValue == null)
{
throw new Exception("Value of discriminator field not defined by subclass map.");
}
jo.Add(jsonMapBase.DiscriminatorFieldName, discriminatorFieldValue);
discriminatorFieldValue = null;
}
var jsonSubclassMap = jsonMapBase as JsonSubclassMap;
if (jsonSubclassMap?.DiscriminatorFieldValue != null)
{
discriminatorFieldValue = jsonSubclassMap.DiscriminatorFieldValue;
}
}
}
if (discriminatorFieldValue != null)
{
throw new Exception("Discriminating value not set to any field.");
}
jo.WriteTo(writer, serializer.Converters.ToArray());
}
