JavaType (jackson-databind 2.12.0 API)

java.lang.Object
- com.fasterxml.jackson.core.type.ResolvedType
- - com.fasterxml.jackson.databind.JavaType

All Implemented Interfaces:

Serializable, Type

Direct Known Subclasses:

TypeBase
```
public abstract class JavaType
extends ResolvedType
implements Serializable, Type
```
Base class for type token classes used both to contain information and as keys for deserializers.
Instances can (only) be constructed by com.fasterxml.jackson.databind.type.TypeFactory.
Since 2.2 this implements Type to allow it to be pushed through interfaces that only expose that type.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected boolean`	`_asStatic` Whether entities defined with this type should be handled using static typing (as opposed to dynamic runtime type) or not.
`protected Class<?>`	`_class` This is the nominal type-erased Class that would be close to the type represented (but not exactly type, due to type erasure: type instance may have more information on this).
`protected int`	`_hash`
`protected Object`	`_typeHandler` Optional handler that can be attached to indicate how to handle additional type metadata associated with this type.
`protected Object`	`_valueHandler` Optional handler (codec) that can be attached to indicate what to use for handling (serializing, deserializing) values of this specific type.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`JavaType(Class<?> raw, int additionalHash, Object valueHandler, Object typeHandler, boolean asStatic)`
`protected`	`JavaType(JavaType base)` Copy-constructor used when refining/upgrading type instances.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`protected abstract JavaType`	`_narrow(Class<?> subclass)` Deprecated.
`abstract JavaType`	`containedType(int index)`
`abstract int`	`containedTypeCount()`
`abstract String`	`containedTypeName(int index)` Deprecated.
`JavaType`	`containedTypeOrUnknown(int index)` Convenience method that is functionally same as: `JavaType t = containedType(index); if (t == null) { t = TypeFactory.unknownType(); }` and typically used to eliminate need for null checks for common case where we just want to check if containedType is available first; and if not, use "unknown type" (which translates to `java.lang.Object` basically).
`abstract boolean`	`equals(Object o)`
`abstract JavaType`	`findSuperType(Class<?> erasedTarget)` Method that may be called to find representation of given type within type hierarchy of this type: either this type (if this type has given erased type), one of its supertypes that has the erased types, or null if target is neither this type or any of its supertypes.
`abstract JavaType[]`	`findTypeParameters(Class<?> expType)` Method that may be used to find paramaterization this type has for given type-erased generic target type.
`JavaType`	`forcedNarrowBy(Class<?> subclass)` Deprecated.
`abstract TypeBindings`	`getBindings()`
`JavaType`	`getContentType()`
`Object`	`getContentTypeHandler()`
`Object`	`getContentValueHandler()`
`String`	`getErasedSignature()` Method for accessing signature without generic type information, in form compatible with all versions of JVM, and specifically used for type descriptions when generating byte code.
`abstract StringBuilder`	`getErasedSignature(StringBuilder sb)` Method for accessing signature without generic type information, in form compatible with all versions of JVM, and specifically used for type descriptions when generating byte code.
`String`	`getGenericSignature()` Method for accessing signature that contains generic type information, in form compatible with JVM 1.5 as per JLS.
`abstract StringBuilder`	`getGenericSignature(StringBuilder sb)`
`abstract List<JavaType>`	`getInterfaces()` Accessor for finding fully resolved interfaces this type implements, if any; empty array if none.
`JavaType`	`getKeyType()`
`Class<?>`	`getParameterSource()` Deprecated.
`Class<?>`	`getRawClass()`
`JavaType`	`getReferencedType()`
`abstract JavaType`	`getSuperClass()` Accessor for finding fully resolved parent class of this type, if it has one; null if not.
`<T> T`	`getTypeHandler()` Method for accessing type handler associated with this type, if any
`<T> T`	`getValueHandler()` Method for accessing value handler associated with this type, if any
`boolean`	`hasContentType()` Accessor that allows determining whether `getContentType()` should return a non-null value (that is, there is a "content type") or not.
`boolean`	`hasGenericTypes()`
`boolean`	`hasHandlers()` Helper method that checks whether this type, or its (optional) key or content type has `getValueHandler()` or `getTypeHandler()`; that is, are there any non-standard handlers associated with this type object.
`int`	`hashCode()`
`boolean`	`hasRawClass(Class<?> clz)` Method that can be used to check whether this type has specified Class as its type erasure.
`boolean`	`hasValueHandler()`
`boolean`	`isAbstract()`
`boolean`	`isArrayType()`
`boolean`	`isCollectionLikeType()`
`boolean`	`isConcrete()` Convenience method for checking whether underlying Java type is a concrete class or not: abstract classes and interfaces are not.
`abstract boolean`	`isContainerType()`
`boolean`	`isEnumImplType()` Similar to `isEnumType()` except does NOT return `true` for `Enum` (since that is not Enum implementation type).
`boolean`	`isEnumType()` Method that basically does equivalent of:
`boolean`	`isFinal()`
`boolean`	`isInterface()`
`boolean`	`isJavaLangObject()` Convenience method, short-hand for `getRawClass() == Object.class` and used to figure if we basically have "untyped" type object.
`boolean`	`isMapLikeType()`
`boolean`	`isPrimitive()`
`boolean`	`isRecordType()`
`boolean`	`isThrowable()`
`boolean`	`isTypeOrSubTypeOf(Class<?> clz)`
`boolean`	`isTypeOrSuperTypeOf(Class<?> clz)`
`abstract JavaType`	`refine(Class<?> rawType, TypeBindings bindings, JavaType superClass, JavaType[] superInterfaces)` Mutant factory method that will try to create and return a sub-type instance for known parameterized types; for other types will return `null` to indicate that no just refinement makes necessary sense, without trying to detect special status through implemented interfaces.
`abstract String`	`toString()`
`boolean`	`useStaticType()` Accessor for checking whether handlers for dealing with values of this type should use static typing (as opposed to dynamic typing).
`abstract JavaType`	`withContentType(JavaType contentType)` Mutant factory method that may be called on structured types that have a so-called content type (element of arrays, value type of Maps, referenced type of referential types), and will construct a new instance that is identical to this instance, except that it has specified content type, instead of current one.
`abstract JavaType`	`withContentTypeHandler(Object h)` Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified content type (element type for arrays, value type for Maps and so forth) handler assigned.
`abstract JavaType`	`withContentValueHandler(Object h)` Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified content value handler assigned.
`JavaType`	`withHandlersFrom(JavaType src)` Mutant factory method that will try to copy handlers that the specified source type instance had, if any; this must be done recursively where necessary (as content types may be structured).
`abstract JavaType`	`withStaticTyping()` Method that can be called to get a type instance that indicates that values of the type should be handled using "static typing" for purposes of serialization (as opposed to "dynamic" aka runtime typing): meaning that no runtime information is needed for determining serializers to use.
`abstract JavaType`	`withTypeHandler(Object h)` "Copy method" that will construct a new instance that is identical to this instance, except that it will have specified type handler assigned.
`abstract JavaType`	`withValueHandler(Object h)` Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified value handler assigned.

Methods inherited from class com.fasterxml.jackson.core.type.ResolvedType
isReferenceType, toCanonical

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.reflect.Type
getTypeName

- Field Detail
  - _class
```
protected final Class<?> _class
```
    This is the nominal type-erased Class that would be close to the type represented (but not exactly type, due to type erasure: type instance may have more information on this). May be an interface or abstract class, so instantiation may not be possible.
  - _hash
```
protected final int _hash
```
  - _valueHandler
```
protected final Object _valueHandler
```
    Optional handler (codec) that can be attached to indicate what to use for handling (serializing, deserializing) values of this specific type.
    Note: untyped (i.e. caller has to cast) because it is used for different kinds of handlers, with unrelated types.
  - _typeHandler
```
protected final Object _typeHandler
```
    Optional handler that can be attached to indicate how to handle additional type metadata associated with this type.
    Note: untyped (i.e. caller has to cast) because it is used for different kinds of handlers, with unrelated types.
  - _asStatic
```
protected final boolean _asStatic
```
    Whether entities defined with this type should be handled using static typing (as opposed to dynamic runtime type) or not.
    
    Since:
    
    2.2
- Constructor Detail
  - JavaType
```
protected JavaType(Class<?> raw,
                   int additionalHash,
                   Object valueHandler,
                   Object typeHandler,
                   boolean asStatic)
```
    Parameters:
    
    raw - "Raw" (type-erased) class for this type
    
    additionalHash - Additional hash code to use, in addition to hash code of the class name
  - JavaType
```
protected JavaType(JavaType base)
```
    Copy-constructor used when refining/upgrading type instances.
    
    Since:
    
    2.7
- Method Detail
  - withTypeHandler
```
public abstract JavaType withTypeHandler(Object h)
```
    "Copy method" that will construct a new instance that is identical to this instance, except that it will have specified type handler assigned.
    
    Returns:
    
    Newly created type instance
  - withContentTypeHandler
```
public abstract JavaType withContentTypeHandler(Object h)
```
    Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified content type (element type for arrays, value type for Maps and so forth) handler assigned.
    
    Returns:
    
    Newly created type instance, with given
  - withValueHandler
```
public abstract JavaType withValueHandler(Object h)
```
    Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified value handler assigned.
    
    Returns:
    
    Newly created type instance
  - withContentValueHandler
```
public abstract JavaType withContentValueHandler(Object h)
```
    Mutant factory method that will construct a new instance that is identical to this instance, except that it will have specified content value handler assigned.
    
    Returns:
    
    Newly created type instance
  - withHandlersFrom
```
public JavaType withHandlersFrom(JavaType src)
```
    Mutant factory method that will try to copy handlers that the specified source type instance had, if any; this must be done recursively where necessary (as content types may be structured).
    
    Since:
    
    2.8.4
  - withContentType
```
public abstract JavaType withContentType(JavaType contentType)
```
    Mutant factory method that may be called on structured types that have a so-called content type (element of arrays, value type of Maps, referenced type of referential types), and will construct a new instance that is identical to this instance, except that it has specified content type, instead of current one. If content type is already set to given type, this is returned. If type does not have a content type (which is the case with SimpleType), IllegalArgumentException will be thrown.
    
    Returns:
    
    Newly created type instance
    
    Since:
    
    2.7
  - withStaticTyping
```
public abstract JavaType withStaticTyping()
```
    Method that can be called to get a type instance that indicates that values of the type should be handled using "static typing" for purposes of serialization (as opposed to "dynamic" aka runtime typing): meaning that no runtime information is needed for determining serializers to use. The main use case is to allow forcing of specific root value serialization type, and specifically in resolving serializers for contained types (element types for arrays, Collections and Maps).
    
    Since:
    
    2.2
  - refine
```
public abstract JavaType refine(Class<?> rawType,
                                TypeBindings bindings,
                                JavaType superClass,
                                JavaType[] superInterfaces)
```
    Mutant factory method that will try to create and return a sub-type instance for known parameterized types; for other types will return `null` to indicate that no just refinement makes necessary sense, without trying to detect special status through implemented interfaces.
    
    Since:
    
    2.7
  - forcedNarrowBy
```
@Deprecated
public JavaType forcedNarrowBy(Class<?> subclass)
```
    Deprecated.
    
    Legacy method used for forcing sub-typing of this type into type specified by specific type erasure. Deprecated as of 2.7 as such specializations really ought to go through TypeFactory, not directly via JavaType.
    
    Since:
    
    2.7
  - _narrow
```
@Deprecated
protected abstract JavaType _narrow(Class<?> subclass)
```
    Deprecated.
  - getRawClass
```
public final Class<?> getRawClass()
```
    Specified by:
    
    getRawClass in class ResolvedType
  - hasRawClass
```
public final boolean hasRawClass(Class<?> clz)
```
    Method that can be used to check whether this type has specified Class as its type erasure. Put another way, returns true if instantiation of this Type is given (type-erased) Class.
    
    Specified by:
    
    hasRawClass in class ResolvedType
  - hasContentType
```
public boolean hasContentType()
```
    Accessor that allows determining whether getContentType() should return a non-null value (that is, there is a "content type") or not. True if isContainerType() or ResolvedType.isReferenceType() return true.
    
    Since:
    
    2.8
  - isTypeOrSubTypeOf
```
public final boolean isTypeOrSubTypeOf(Class<?> clz)
```
    Since:
    
    2.6
  - isTypeOrSuperTypeOf
```
public final boolean isTypeOrSuperTypeOf(Class<?> clz)
```
    Since:
    
    2.9
  - isAbstract
```
public boolean isAbstract()
```
    Specified by:
    
    isAbstract in class ResolvedType
  - isConcrete
```
public boolean isConcrete()
```
    Convenience method for checking whether underlying Java type is a concrete class or not: abstract classes and interfaces are not.
    
    Specified by:
    
    isConcrete in class ResolvedType
  - isThrowable
```
public boolean isThrowable()
```
    Specified by:
    
    isThrowable in class ResolvedType
  - isArrayType
```
public boolean isArrayType()
```
    Specified by:
    
    isArrayType in class ResolvedType
  - isEnumType
```
public final boolean isEnumType()
```
    Method that basically does equivalent of:
```
  Enum.class.isAssignableFrom(getRawClass())
```
    that is, return true if the underlying type erased class is Enum or one its subtypes (Enum implementations).
    Specified by:
    
    isEnumType in class ResolvedType
  - isEnumImplType
```
public final boolean isEnumImplType()
```
    Similar to isEnumType() except does NOT return true for Enum (since that is not Enum implementation type).
    
    Since:
    
    2.11
  - isRecordType
```
public final boolean isRecordType()
```
    Since:
    
    2.12
  - isInterface
```
public final boolean isInterface()
```
    Specified by:
    
    isInterface in class ResolvedType
  - isPrimitive
```
public final boolean isPrimitive()
```
    Specified by:
    
    isPrimitive in class ResolvedType
  - isFinal
```
public final boolean isFinal()
```
    Specified by:
    
    isFinal in class ResolvedType
  - isContainerType
```
public abstract boolean isContainerType()
```
    Specified by:
    
    isContainerType in class ResolvedType
    
    Returns:
    
    True if type represented is a container type; this includes array, Map and Collection types.
  - isCollectionLikeType
```
public boolean isCollectionLikeType()
```
    Specified by:
    
    isCollectionLikeType in class ResolvedType
    
    Returns:
    
    True if type is either true Collection type, or something similar (meaning it has at least one type parameter, which describes type of contents)
  - isMapLikeType
```
public boolean isMapLikeType()
```
    Specified by:
    
    isMapLikeType in class ResolvedType
    
    Returns:
    
    True if type is either true Map type, or something similar (meaning it has at least two type parameter; first one describing key type, second value type)
  - isJavaLangObject
```
public final boolean isJavaLangObject()
```
    Convenience method, short-hand for getRawClass() == Object.class and used to figure if we basically have "untyped" type object.
    
    Since:
    
    2.5
  - useStaticType
```
public final boolean useStaticType()
```
    Accessor for checking whether handlers for dealing with values of this type should use static typing (as opposed to dynamic typing). Note that while value of 'true' does mean that static typing is to be used, value of 'false' may still be overridden by other settings.
    
    Since:
    
    2.2
  - hasGenericTypes
```
public boolean hasGenericTypes()
```
    Specified by:
    
    hasGenericTypes in class ResolvedType
  - getKeyType
```
public JavaType getKeyType()
```
    Specified by:
    
    getKeyType in class ResolvedType
  - getContentType
```
public JavaType getContentType()
```
    Specified by:
    
    getContentType in class ResolvedType
  - getReferencedType
```
public JavaType getReferencedType()
```
    Specified by:
    
    getReferencedType in class ResolvedType
  - containedTypeCount
```
public abstract int containedTypeCount()
```
    Specified by:
    
    containedTypeCount in class ResolvedType
  - containedType
```
public abstract JavaType containedType(int index)
```
    Specified by:
    
    containedType in class ResolvedType
  - containedTypeName
```
@Deprecated
public abstract String containedTypeName(int index)
```
    Deprecated.
    
    Specified by:
    
    containedTypeName in class ResolvedType
  - getParameterSource
```
@Deprecated
public Class<?> getParameterSource()
```
    Deprecated.
    
    Overrides:
    
    getParameterSource in class ResolvedType
  - containedTypeOrUnknown
```
public JavaType containedTypeOrUnknown(int index)
```
    Convenience method that is functionally same as: JavaType t = containedType(index); if (t == null) { t = TypeFactory.unknownType(); } and typically used to eliminate need for null checks for common case where we just want to check if containedType is available first; and if not, use "unknown type" (which translates to java.lang.Object basically).
    
    Since:
    
    2.5
  - getBindings
```
public abstract TypeBindings getBindings()
```
    Since:
    
    2.7
  - findSuperType
```
public abstract JavaType findSuperType(Class<?> erasedTarget)
```
    Method that may be called to find representation of given type within type hierarchy of this type: either this type (if this type has given erased type), one of its supertypes that has the erased types, or null if target is neither this type or any of its supertypes.
    
    Since:
    
    2.7
  - getSuperClass
```
public abstract JavaType getSuperClass()
```
    Accessor for finding fully resolved parent class of this type, if it has one; null if not.
    
    Since:
    
    2.7
  - getInterfaces
```
public abstract List<JavaType> getInterfaces()
```
    Accessor for finding fully resolved interfaces this type implements, if any; empty array if none.
    
    Since:
    
    2.7
  - findTypeParameters
```
public abstract JavaType[] findTypeParameters(Class<?> expType)
```
    Method that may be used to find paramaterization this type has for given type-erased generic target type.
    
    Since:
    
    2.7
  - getValueHandler
```
public <T> T getValueHandler()
```
    Method for accessing value handler associated with this type, if any
  - getTypeHandler
```
public <T> T getTypeHandler()
```
    Method for accessing type handler associated with this type, if any
  - getContentValueHandler
```
public Object getContentValueHandler()
```
    Since:
    
    2.7
  - getContentTypeHandler
```
public Object getContentTypeHandler()
```
    Since:
    
    2.7
  - hasValueHandler
```
public boolean hasValueHandler()
```
    Since:
    
    2.6
  - hasHandlers
```
public boolean hasHandlers()
```
    Helper method that checks whether this type, or its (optional) key or content type has getValueHandler() or getTypeHandler(); that is, are there any non-standard handlers associated with this type object.
    
    Since:
    
    2.8
  - getGenericSignature
```
public String getGenericSignature()
```
    Method for accessing signature that contains generic type information, in form compatible with JVM 1.5 as per JLS. It is a superset of getErasedSignature(), in that generic information can be automatically removed if necessary (just remove outermost angle brackets along with content inside)
  - getGenericSignature
```
public abstract StringBuilder getGenericSignature(StringBuilder sb)
```
    Parameters:
    
    sb - StringBuilder to append signature to
    
    Returns:
    
    StringBuilder that was passed in; returned to allow call chaining
  - getErasedSignature
```
public String getErasedSignature()
```
    Method for accessing signature without generic type information, in form compatible with all versions of JVM, and specifically used for type descriptions when generating byte code.
  - getErasedSignature
```
public abstract StringBuilder getErasedSignature(StringBuilder sb)
```
    Method for accessing signature without generic type information, in form compatible with all versions of JVM, and specifically used for type descriptions when generating byte code.
    
    Parameters:
    
    sb - StringBuilder to append signature to
    
    Returns:
    
    StringBuilder that was passed in; returned to allow call chaining
  - toString
```
public abstract String toString()
```
    Overrides:
    
    toString in class Object
  - equals
```
public abstract boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public final int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class JavaType

Field Summary

Constructor Summary

Method Summary

Methods inherited from class com.fasterxml.jackson.core.type.ResolvedType

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.reflect.Type

Field Detail

_class

_hash

_valueHandler

_typeHandler

_asStatic

Constructor Detail

JavaType

JavaType

Method Detail

withTypeHandler

withContentTypeHandler

withValueHandler

withContentValueHandler

withHandlersFrom

withContentType

withStaticTyping

refine

forcedNarrowBy

_narrow

getRawClass

hasRawClass

hasContentType

isTypeOrSubTypeOf

isTypeOrSuperTypeOf

isAbstract

isConcrete

isThrowable

isArrayType

isEnumType

isEnumImplType

isRecordType

isInterface

isPrimitive

isFinal

isContainerType

isCollectionLikeType

isMapLikeType

isJavaLangObject

useStaticType

hasGenericTypes

getKeyType

getContentType

getReferencedType

containedTypeCount

containedType

containedTypeName

getParameterSource

containedTypeOrUnknown

getBindings

findSuperType

getSuperClass

getInterfaces

findTypeParameters

getValueHandler

getTypeHandler

getContentValueHandler

getContentTypeHandler

hasValueHandler

hasHandlers

getGenericSignature

getGenericSignature

getErasedSignature

getErasedSignature

toString

equals

hashCode