Json.kt | Json bindings for Kotlin/Multiplatform | JSON Processing library
kandi X-RAY | Json.kt Summary
kandi X-RAY | Json.kt Summary
委譲プロパティを使い, 直感的に JSON を Kotlin のクラスに変換できます。 Using delegated properties, you can intuitively convert JSON to Kotlin classes. 現時点では JVM (Android), JS target に対応しています。 At present, it supports Java 8 or later, Android, and JavaScript target.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Json.kt
Json.kt Key Features
Json.kt Examples and Code Snippets
data class Model(override val json: JsonObject): JsonModel {
val a by int
val b by float
val c by string
val d by intList
val e by model { E(it) }
val f by modelList { E(it) }
data class E(override val json: JsonObject):
Community Discussions
Trending Discussions on Json.kt
QUESTION
I am trying to serialize a json, but its throwing JsonDecodingException. Check the code:
SerializationTestCase.kt:
...ANSWER
Answered 2021-Mar-18 at 23:09Your Kotlin declarations do not match your Json data. To fix the declarations:
- Change your class discriminator to
type
. - Remove the class discriminator property
type
from your base class as it will be used implicitly by kotlinx.serialization. - Make the
@SerialName
annotation value for theTeamModule
class match the Json discriminator valueteam
.
Working code:
QUESTION
I'm currently struggling with the experimental KXS-properties serialization backend, mainly because of two reasons:
- I can't find any documentation for it (I think there is none)
- KXS-properties only includes a serializer / deserializer, but no encoder / decoder
The endpoint provided by the framework is essentially Map
, but the map is flat and the keys already have the usual dot-separated properties syntax. So the step that I have to take is to encode the map to a single string that is printable to a .properties
file AND decode a single string from a .properties
file into the map. I'm generally following the Properties Format Spec from https://docs.oracle.com/javase/10/docs/api/java/util/Properties.html#load(java.io.Reader), it's not as easy as one might think.
The problem is that I can't use java.util.Properties
right away because KXS is multiplatform and it would kinda kill the purpose of it when I'd restrict it to JVM because I use java.util.Properties
. If I were to use it, the solution would be pretty simple, like this: https://gist.github.com/RaphaelTarita/748e02c06574b20c25ab96c87235096d
So I'm trying to implement my own encoder / decoder, following the rough structure of kotlinx.serialization.json.Json.kt
. Although it's pretty tedious, it went well so far, but now I've stumbled upon a new problem:
As far as I know (I am not sure because there is no documentation), the map only contains primitives (or primitive-equivalents, as Kotlin does not really have primitives). I suspect this because when you write your own KSerializer
s for the KXS frontend, you can specify to encode to any primitive by invoking the encodeXXX()
functions of the Encoder
interface. Now the problem is: When I try to decode to the map that should contain primitives, how do I even know which primitives are expected by the model class?
I've once written my own serializer / deserializer in Java to learn about the topic, but in that implementation, the backend was a lot more tightly coupled to the frontend, so that I could query the expected primitive type from the model class in the backend. But in my situation, I don't have access to the model class and I have no clue how to retrieve the expected types.
As you can see, I've tried multiple approaches, but none of them worked right away. If you can help me to get any of these to work, that would be very much appreciated
Thank you!
...ANSWER
Answered 2020-Oct-20 at 09:33The way it works in kotlinx.serialization is that there are serializers that describe classes and structures etc. as well as code that writes/read properties as well as the struct. It is then the job of the format to map those operations to/from a data format.
The intended purpose of kotlinx.serialization.Properties is to support serializing a Kotlin class to/from a java.util.Properties like structure. It is fairly simple in setup in that every nested property is serialized by prepending the property name to the name (the dotted properties syntax).
Unfortunately it is indeed the case that this deserializing from this format requires knowing the types expected. It doesn't just read from string. However, it is possible to determine the structure. You can use the descriptor
property of the serializer to introspect the expectations.
From my perspective this format is a bit more simple than it should be. It is a good example of a custom format though. A key distinction between formats is whether they are intended to just provide a storage format, or whether the output is intended (be able to) to represent a well designed api. The latter ones need to be more complex.
QUESTION
I'm very new to Kotlin and am curious what magic allows this code to work:
...ANSWER
Answered 2020-Sep-30 at 19:34That method is currently part of an experimental API in SerialFormat.kt:
It is an extension function with the following interface:
QUESTION
I'm trying to create a custom deserializer using kotlinx.serialization but when I deerialize a JSON payload with null parameters, an exception kotlinx.serialization.json.JsonDecodingException: Unexpected JSON token at offset 31: Expected string or non-null literal.
is threw. I apologize if there is any English error; if more information is missing, just let me know that I will edit the post.
Note: There is nothing wrong with the EventDecoder.
JSON:
...ANSWER
Answered 2020-Jul-04 at 04:24My problem has already been solved. I had forgotten to decode one of the elements.
QUESTION
I am trying kotlin for the first time.
I was able to run compile the hello world program in kotlin on command line but I am not able to compile program where I want to include external java library
...ANSWER
Answered 2018-Dec-03 at 12:10When you use -jar
, the -cp
argument is ignored, so you can't specify any additional dependencies. Instead, you need to specify both jars in the -cp
argument:
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