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

Constructor Summary

Constructors

Constructor and Description
ConstantValueInstantiator(java.lang.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.
java.lang.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.
java.lang.Class<?>	getValueClass() Accessor for raw (type-erased) type of instances to create.

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

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

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

Constructor Detail

ConstantValueInstantiator

public ConstantValueInstantiator(java.lang.Object value)

Method Detail

getValueClass

public java.lang.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 java.lang.Object createUsingDefault(DeserializationContext ctxt)
                                    throws java.io.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:

java.io.IOException