Class CustomSerializerFactory


  • public class CustomSerializerFactory
    extends BeanSerializerFactory
    Serializer factory implementation that allows for configuring mapping between types (classes) and serializers to use, by using multiple types of overrides. Existing mappings established by BeanSerializerFactory (and its super class, BasicSerializerFactory) are used if no overrides are defined.

    Unlike base serializer factories (BasicSerializerFactory, BeanSerializerFactory), this factory is stateful because of configuration settings. It is thread-safe, however, as long as all configuration as done before using the factory -- a single instance can be shared between providers and mappers.

    Configurations currently available are:

    • Ability to define explicit mappings between classes and interfaces and serializers to use. These can be either specific ones (class must match exactly) or generic ones (any sub-class or class implementing the interface); specific ones have precedence over generic ones (and precedence between generic ones is not defined).
    • Ability to define a single generic base serializer for all Enum types (precedence below specific serializer mapping)

    Note: as of version 1.7, this class is not as useful as it used to be, due to addition of "modules", which allow simpler addition of custom serializers and deserializers. In fact, use of module system is recommended even when not exposing serializers or deserializers as a pluggable library (just using them locally).

    • Field Detail

      • _directClassMappings

        protected java.util.HashMap<ClassKey,​JsonSerializer<?>> _directClassMappings
        Direct mappings that are only used for exact class type matches, but not for sub-class checks.
      • _enumSerializerOverride

        protected JsonSerializer<?> _enumSerializerOverride
        And for Enum handling we may specify a single default serializer to use, regardless of actual enumeration. Usually used to provide "toString - serializer".
      • _transitiveClassMappings

        protected java.util.HashMap<ClassKey,​JsonSerializer<?>> _transitiveClassMappings
        And then class-based mappings that are used both for exact and sub-class matches.
      • _interfaceMappings

        protected java.util.HashMap<ClassKey,​JsonSerializer<?>> _interfaceMappings
        And finally interface-based matches.
    • Constructor Detail

      • CustomSerializerFactory

        public CustomSerializerFactory()
    • Method Detail

      • addGenericMapping

        public <T> void addGenericMapping​(java.lang.Class<? extends T> type,
                                          JsonSerializer<T> ser)
        Method used to add a generic (transitive) mapping from specified class or its sub-classes into a serializer. When resolving a type into a serializer, explicit class is checked first, then immediate super-class, and so forth along inheritance chain. But if this fails, implemented interfaces are checked; ordering is done such that first interfaces implemented by the exact type are checked (in order returned by Class.getInterfaces()), then super-type's and so forth.

        Note that adding generic mappings may lead to problems with sub-classing: if sub-classes add new properties, these may not get properly serialized.

        Parameters:
        type - Class for which specified serializer is to be used. May be more specific type than what serializer indicates, but must be compatible (same or sub-class)
      • addSpecificMapping

        public <T> void addSpecificMapping​(java.lang.Class<? extends T> forClass,
                                           JsonSerializer<T> ser)
        Method used to add a mapping from specific type -- and only that type -- to specified serializer. This means that binding is not used for sub-types. It also means that no such mappings are to be defined for abstract classes or interfaces: and if an attempt is made, IllegalArgumentException will be thrown to indicate caller error.
        Parameters:
        forClass - Class for which specified serializer is to be used. May be more specific type than what serializer indicates, but must be compatible (same or sub-class)
      • setEnumSerializer

        public void setEnumSerializer​(JsonSerializer<?> enumSer)
        Method that can be used to force specified serializer to be used for serializing all Enum instances. This is most commonly used to specify serializers that call either enum.toString(), or modify value returned by enum.name() (such as upper- or lower-casing it).

        Note: this serializer has lower precedence than that of specific types; so if a specific serializer is assigned to an Enum type, this serializer will NOT be used. It has higher precedence than generic mappings have however.

      • _findInterfaceMapping

        protected JsonSerializer<?> _findInterfaceMapping​(java.lang.Class<?> cls,
                                                          ClassKey key)