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

Packages that use ClassKey
Package | Description
--- | ---
com.fasterxml.jackson.databind | Contains basic mapper (conversion) functionality that allows for converting between regular streaming json content and Java objects (beans or Tree Model: support for both is via `ObjectMapper` class, as well as convenience methods included in `JsonParser`
com.fasterxml.jackson.databind.cfg | Package that contains most of configuration-related classes; exception being couple of most-commonly used configuration things (like Feature enumerations) that are at the main level (`com.fasterxml.jackson.databind`).
com.fasterxml.jackson.databind.deser | Contains implementation classes of deserialization part of data binding.
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

Fields in com.fasterxml.jackson.databind with type parameters of type ClassKey
Modifier and Type | Field and Description
--- | ---
`protected HashMap<ClassKey,Class<?>>` | ObjectMapper.`_mixInAnnotations` Mapping that defines how to apply mix-in annotations: key is the type to received additional annotations, and value is the type that has annotations to "mix in".

Constructor parameters in com.fasterxml.jackson.databind with type arguments of type ClassKey
Constructor and Description
`DeserializationConfig(BaseSettings base, SubtypeResolver str, Map<ClassKey,Class<?>> mixins)` Constructor used by ObjectMapper to create default configuration object instance.
`DeserializationConfig(DeserializationConfig src, Map<ClassKey,Class<?>> mixins)`
`SerializationConfig(BaseSettings base, SubtypeResolver str, Map<ClassKey,Class<?>> mixins)` Constructor used by ObjectMapper to create default configuration object instance.
`SerializationConfig(SerializationConfig src, Map<ClassKey,Class<?>> mixins)`

### Uses of ClassKey in com.fasterxml.jackson.databind.cfg

Fields in com.fasterxml.jackson.databind.cfg with type parameters of type ClassKey
Modifier and Type | Field and Description
--- | ---
`protected Map<ClassKey,Class<?>>` | MapperConfigBase.`_mixInAnnotations` Mix-in annotation mappings to use, if any: immutable, can not be changed once defined.

Constructor parameters in com.fasterxml.jackson.databind.cfg with type arguments of type ClassKey
Constructor and Description
`MapperConfigBase(BaseSettings base, SubtypeResolver str, Map<ClassKey,Class<?>> mixins)` Constructor used when creating a new instance (compared to that of creating fluent copies)
`MapperConfigBase(MapperConfigBase<CFG,T> src, Map<ClassKey,Class<?>> mixins)`

### 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.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

Fields in com.fasterxml.jackson.databind.type with type parameters of type ClassKey
Modifier and Type | Field and Description
--- | ---
`protected LRUMap<ClassKey,JavaType>` | TypeFactory.`_typeCache` Since type resolution can be expensive (specifically when resolving actual generic types), we will use small cache to avoid repetitive resolution of core types

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,com.fasterxml.jackson.core.SerializableString>` | RootNameLookup.`_rootNames` For efficient operation, let's try to minimize number of times we need to introspect root element name to use.