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I have a legacy project that is using both jackson and gson deserializers. I would like to use retrofit to parse data from either. However the problem is that neither the JacksonConverterFactory or GsonConverterFactory return null for the responseBodyConverter. IE here is the jackson impl:
I get that since JacksonConverterFactory never returns null, such that the converter factory will be skipped I would need to write my own ConverterFactory impl. I am looking for a way in jackson to look at the mappers module and determine if there is a customer deserializer. However form the docs and public API I cannot seem to find the registered deserializers.
I am not sure what you mean but as far as I understood you want to use both of the converter factories and customize them up to your liking. If that is the case, you can take a look at this: -vs-gson.Hope that could help.
Contract for a ConverterFactory that provides a factory method to create a converter instance forthe requested type. Factories handle the details of object creation.It allows the consumers of the factory to create specific converterswithout knowing the internals of the converter creation.JET provides three factory implementations for number and datetimeand color types that implement this contract.
This article shows how to create custom converters for the JSON serialization classes that are provided in the System.Text.Json namespace. For an introduction to System.Text.Json, see How to serialize and deserialize JSON in .NET.
A converter is a class that converts an object or a value to and from JSON. The System.Text.Json namespace has built-in converters for most primitive types that map to JavaScript primitives. You can write custom converters to override the default behavior of a built-in converter. For example:
There are two patterns for creating a custom converter: the basic pattern and the factory pattern. The factory pattern is for converters that handle type Enum or open generics. The basic pattern is for non-generic and closed generic types. For example, converters for the following types require the factory pattern:
The basic pattern creates a class that can handle one type. The factory pattern creates a class that determines, at run time, which specific type is required and dynamically creates the appropriate converter.
The following code shows a custom converter that works with Dictionary. The code follows the factory pattern because the first generic type parameter is Enum and the second is open. The CanConvert method returns true only for a Dictionary with two generic parameters, the first of which is an Enum type. The inner converter gets an existing converter to handle whichever type is provided at run time for TValue.
The factory pattern is required for open generics because the code to convert an object to and from a string isn't the same for all types. A converter for an open generic type (List, for example) has to create a converter for a closed generic type (List, for example) behind the scenes. Code must be written to handle each closed-generic type that the converter can handle.
If your converter is converting a JSON object, the Utf8JsonReader will be positioned on the begin object token when the Read method begins. You must then read through all the tokens in that object and exit the method with the reader positioned on the corresponding end object token. If you read beyond the end of the object, or if you stop before reaching the corresponding end token, you get a JsonException exception indicating that:
For an example, see the preceding factory pattern sample converter. The Read method starts by verifying that the reader is positioned on a start object token. It reads until it finds that it is positioned on the next end object token. It stops on the next end object token because there are no intervening start object tokens that would indicate an object within the object. The same rule about begin token and end token applies if you are converting an array. For an example, see the Stack sample converter later in this article.
If you throw a JsonException without a message, the serializer creates a message that includes the path to the part of the JSON that caused the error. For example, the statement throw new JsonException() produces an error message like the following example:
If you throw a NotSupportedException, you always get the path information in the message. If you provide a message, the path information is appended to it. For example, the statement throw new NotSupportedException("Error occurred.") produces an error message like the following example:
When you want to disallow certain types, throw a NotSupportedException. This exception is what the serializer automatically throws for types that are not supported. For example, System.Type is not supported for security reasons, so an attempt to deserialize it results in a NotSupportedException.
The [JsonConverter] attribute on the struct registers the custom converter as the default for properties of type Temperature. The converter is automatically used on the TemperatureCelsius property of the following type when you serialize or deserialize it:
When deserializing to a property of type object, a JsonElement object is created. The reason is that the deserializer doesn't know what CLR type to create, and it doesn't try to guess. For example, if a JSON property has "true", the deserializer doesn't infer that the value is a Boolean, and if an element has "01/01/2019", the deserializer doesn't infer that it's a DateTime.
Type inference can be inaccurate. If the deserializer parses a JSON number that has no decimal point as a long, that might result in out-of-range issues if the value was originally serialized as a ulong or BigInteger. Parsing a number that has a decimal point as a double might lose precision if the number was originally serialized as a decimal.
The example shows the converter code and a WeatherForecast class with object properties. The Main method deserializes a JSON string into a WeatherForecast instance, first without using the converter, and then using the converter. The console output shows that without the converter, the run-time type for the Date property is JsonElement; with the converter, the run-time type is DateTime.
.NET 7 provides support for both polymorphic serialization and deserialization. However, in previous .NET versions, there was limited polymorphic serialization support and no support for deserialization. If you're using .NET 6 or an earlier version, deserialization requires a custom converter.
Suppose, for example, you have a Person abstract base class, with Employee and Customer derived classes. Polymorphic deserialization means that at design time you can specify Person as the deserialization target, and Customer and Employee objects in the JSON are correctly deserialized at run time. During deserialization, you have to find clues that identify the required type in the JSON. The kinds of clues available vary with each scenario. For example, a discriminator property might be available or you might have to rely on the presence or absence of a particular property. The current release of System.Text.Json doesn't provide attributes to specify how to handle polymorphic deserialization scenarios, so custom converters are required.
The following code shows a base class, two derived classes, and a custom converter for them. The converter uses a discriminator property to do polymorphic deserialization. The type discriminator isn't in the class definitions but is created during serialization and is read during deserialization.
The converter code in the preceding example reads and writes each property manually. An alternative is to call Deserialize or Serialize to do some of the work. For an example, see this StackOverflow post.
A disadvantage of this method is you can't pass in the original options instance that registers the converter to Deserialize. Doing so would cause a stack overflow, as explained in Required properties. The following example shows a Read method that uses this alternative:
If you deserialize a JSON string into a Stack object and then serialize that object, the contents of the stack are in reverse order. This behavior applies to the following types and interfaces, and user-defined types that derive from them:
By default, the built-in JsonStringEnumConverter can serialize and deserialize string values for enums. It works without a specified naming policy or with the CamelCase naming policy. It doesn't support other naming policies, such as snake case. For information about custom converter code that can support round-tripping to and from enum string values while using a snake case naming policy, see GitHub issue dotnet/runtime #31619. Alternatively, upgrade to .NET 7 or later versions, which provide built-in support for applying naming policies when round-tripping to and from enum string values.
In some scenarios, you might want to use the default system converter in a custom converter. To do that, get the system converter from the JsonSerializerOptions.Default property, as shown in the following example:
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