## Uses of Class
com.fasterxml.jackson.databind.type.ClassKey

- Packages that use ClassKey
  Package | Description
  --- | ---
  com.fasterxml.jackson.databind.deser | Contains implementation classes of deserialization part of data binding.
  com.fasterxml.jackson.databind.introspect | Functionality needed for Bean introspection, required for detecting accessors and mutators for Beans, as well as locating and handling method annotations.
  com.fasterxml.jackson.databind.module | Package that contains classes and interfaces to help implement custom extension `Module`s (which are registered using `ObjectMapper.registerModule(com.fasterxml.jackson.databind.Module)`.
  com.fasterxml.jackson.databind.type | Package that contains concrete implementations of `JavaType`, as well as the factory (`TypeFactory`) for constructing instances from various input data types (like `Class`, `Type`) and programmatically (for structured types, arrays, `List`s and `Map`s).
  com.fasterxml.jackson.databind.util | Utility classes for Mapper package.

- - ### Uses of ClassKey in com.fasterxml.jackson.databind.deser

    Fields in com.fasterxml.jackson.databind.deser with type parameters of type ClassKey
    Modifier and Type | Field and Description
    --- | ---
    `protected HashMap<ClassKey,JsonDeserializer<Object>>` | BeanDeserializerBase.`_subDeserializers` Lazily constructed map used to contain deserializers needed for polymorphic subtypes.

  - ### Uses of ClassKey in com.fasterxml.jackson.databind.introspect

    Fields in com.fasterxml.jackson.databind.introspect with type parameters of type ClassKey
    Modifier and Type | Field and Description
    --- | ---
    `protected Map<ClassKey,Class<?>>` | SimpleMixInResolver.`_localMixIns` Simple mix-in targets defined locally.

    Constructor parameters in com.fasterxml.jackson.databind.introspect with type arguments of type ClassKey
    Constructor and Description
    `SimpleMixInResolver(ClassIntrospector.MixInResolver overrides, Map<ClassKey,Class<?>> mixins)`

  - ### Uses of ClassKey in com.fasterxml.jackson.databind.module

    Fields in com.fasterxml.jackson.databind.module with type parameters of type ClassKey
    Modifier and Type | Field and Description
    --- | ---
    `protected HashMap<ClassKey,ValueInstantiator>` | SimpleValueInstantiators.`_classMappings` Mappings from raw (type-erased, i.e.
    `protected HashMap<ClassKey,JsonSerializer<?>>` | SimpleSerializers.`_classMappings` Class-based mappings that are used both for exact and sub-class matches.
    `protected HashMap<ClassKey,KeyDeserializer>` | SimpleKeyDeserializers.`_classMappings`
    `protected HashMap<ClassKey,JsonDeserializer<?>>` | SimpleDeserializers.`_classMappings`
    `protected HashMap<ClassKey,JsonSerializer<?>>` | SimpleSerializers.`_interfaceMappings` Interface-based matches.
    `protected HashMap<ClassKey,Class<?>>` | SimpleAbstractTypeResolver.`_mappings` Mappings from super types to subtypes

    Methods in com.fasterxml.jackson.databind.module with parameters of type ClassKey
    Modifier and Type | Method and Description
    --- | ---
    `protected JsonSerializer<?>` | SimpleSerializers.`_findInterfaceMapping(Class<?> cls, ClassKey key)`

  - ### Uses of ClassKey in com.fasterxml.jackson.databind.type

    Methods in com.fasterxml.jackson.databind.type with parameters of type ClassKey
    Modifier and Type | Method and Description
    --- | ---
    `int` | ClassKey.`compareTo(ClassKey other)`

  - ### Uses of ClassKey in com.fasterxml.jackson.databind.util

    Fields in com.fasterxml.jackson.databind.util with type parameters of type ClassKey
    Modifier and Type | Field and Description
    --- | ---
    `protected LRUMap<ClassKey,PropertyName>` | RootNameLookup.`_rootNames` For efficient operation, let's try to minimize number of times we need to introspect root element name to use.

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