Class ScalaMapSerde<K,V>

java.lang.Object
io.micronaut.scala.serde.ScalaMapSerde<K,V>
Type Parameters:
K - The key type
V - The value type
All Implemented Interfaces:
io.micronaut.serde.Serializer<scala.collection.Map<K,V>>, io.micronaut.serde.util.CustomizableSerializer<scala.collection.Map<K,V>>
@Singleton @Requires(classes=io.micronaut.serde.Serializer.class) public final class ScalaMapSerde<K,V> extends Object implements io.micronaut.serde.util.CustomizableSerializer<scala.collection.Map<K,V>>
Serialization for a Scala Map, which is a JSON object rather than a list of pairs.

A Scala map is an iterable of Tuple2, so the serializer for the collections would take it as one and write an array of tuples -- and then fail, because a tuple has no introspection either. It needs its own handling for the same reason java.util.Map does: the keys become the field names.

Reading a map back is ScalaCollectionDeserializer's job, for the reason given there.

Declared over any key type, as java.util.Map's own serializer is: a serializer is matched by the type arguments it declares, so one written for Map[String, V] did not answer for a member declared Map[Int, V], and that member fell back to being introspected as a bean. A JSON key is a string whatever the map's key is; the key is written as its string form, and the deserializer converts it back to the declared key type.

  • Nested Class Summary

    Nested classes/interfaces inherited from interface io.micronaut.serde.Serializer

    io.micronaut.serde.Serializer.EncoderContext

  • Constructor Summary

    Constructors
    Constructor
    Description
    ScalaMapSerde()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    io.micronaut.serde.Serializer<scala.collection.Map<K,V>>
    createSpecific(io.micronaut.serde.Serializer.EncoderContext context, io.micronaut.core.type.Argument<? extends scala.collection.Map<K,V>> type)
     

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface io.micronaut.serde.util.CustomizableSerializer

    isAbsent, isEmpty, serialize

    Methods inherited from interface io.micronaut.serde.Serializer

    isDefault

  • Constructor Details

    • ScalaMapSerde

      public ScalaMapSerde()

  • Method Details

    • createSpecific

      public io.micronaut.serde.Serializer<scala.collection.Map<K,V>> createSpecific(io.micronaut.serde.Serializer.EncoderContext context, io.micronaut.core.type.Argument<? extends scala.collection.Map<K,V>> type) throws io.micronaut.serde.exceptions.SerdeException
      Specified by:
      createSpecific in interface io.micronaut.serde.Serializer<K>
      Throws:
      io.micronaut.serde.exceptions.SerdeException