com.fasterxml.jackson.databind.util

Class ConstantValueInstantiator

java.lang.Object

com.fasterxml.jackson.databind.deser.ValueInstantiator

com.fasterxml.jackson.databind.util.ConstantValueInstantiator

public class ConstantValueInstantiator
extends ValueInstantiator

Trivial ValueInstantiator implementation that will simply return constant Object it is configured with. May be used as-is, or as base class to override simplistic behavior further.

Since:

2.9.4

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.deser.ValueInstantiator

ValueInstantiator.Base, ValueInstantiator.Gettable

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	_value

Constructor Summary

Constructors

Constructor and Description
ConstantValueInstantiator(Object value)

Method Summary

Modifier and Type	Method and Description
boolean	canCreateUsingDefault() Method that can be called to check whether a default creator (constructor, or no-arg static factory method) is available for this instantiator
boolean	canInstantiate() Method that will return true if any of canCreateXxx method returns true: that is, if there is any way that an instance could be created.
Object	createUsingDefault(DeserializationContext ctxt) Method called to create value instance from a JSON value when no data needs to passed to creator (constructor, factory method); typically this will call the default constructor of the value object.
Class<?>	getValueClass() Accessor for raw (type-erased) type of instances to create.

Methods inherited from class com.fasterxml.jackson.databind.deser.ValueInstantiator

_createFromStringFallbacks, canCreateFromBoolean, canCreateFromDouble, canCreateFromInt, canCreateFromLong, canCreateFromObjectWith, canCreateFromString, canCreateUsingArrayDelegate, canCreateUsingDelegate, createFromBoolean, createFromDouble, createFromInt, createFromLong, createFromObjectWith, createFromObjectWith, createFromString, createUsingArrayDelegate, createUsingDelegate, getArrayDelegateCreator, getArrayDelegateType, getDefaultCreator, getDelegateCreator, getDelegateType, getFromObjectArguments, getIncompleteParameter, getValueTypeDesc, getWithArgsCreator

Methods inherited from class java.lang.Object

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

Field Detail

_value

protected final Object _value

Constructor Detail

ConstantValueInstantiator

public ConstantValueInstantiator(Object value)

Method Detail

getValueClass

public Class<?> getValueClass()

Description copied from class: ValueInstantiator

Accessor for raw (type-erased) type of instances to create.

NOTE: since this method has not existed since beginning of Jackson 2.0 series, default implementation will just return Object.class; implementations are expected to override it with real value.

Overrides:

getValueClass in class ValueInstantiator

canInstantiate

public boolean canInstantiate()

Description copied from class: ValueInstantiator

Method that will return true if any of canCreateXxx method returns true: that is, if there is any way that an instance could be created.

Overrides:

canInstantiate in class ValueInstantiator

canCreateUsingDefault

public boolean canCreateUsingDefault()

Description copied from class: ValueInstantiator

Method that can be called to check whether a default creator (constructor, or no-arg static factory method) is available for this instantiator

Overrides:

canCreateUsingDefault in class ValueInstantiator

createUsingDefault

public Object createUsingDefault(DeserializationContext ctxt)
                          throws IOException

Description copied from class: ValueInstantiator

Method called to create value instance from a JSON value when no data needs to passed to creator (constructor, factory method); typically this will call the default constructor of the value object. It will only be used if more specific creator methods are not applicable; hence "default".

This method is called if ValueInstantiator.getFromObjectArguments(com.fasterxml.jackson.databind.DeserializationConfig) returns null or empty List.

Overrides:

createUsingDefault in class ValueInstantiator

Throws:

IOException