NullValueProvider (jackson-databind 2.18.2)

All Known Implementing Classes:

AbstractDeserializer, ArrayBlockingQueueDeserializer, AtomicBooleanDeserializer, AtomicIntegerDeserializer, AtomicLongDeserializer, AtomicReferenceDeserializer, BeanAsArrayBuilderDeserializer, BeanAsArrayDeserializer, BeanDeserializer, BeanDeserializerBase, BuilderBasedDeserializer, ByteBufferDeserializer, CollectionDeserializer, ContainerDeserializerBase, CoreXMLDeserializers.Std, DateDeserializers.CalendarDeserializer, DateDeserializers.DateBasedDeserializer, DateDeserializers.DateDeserializer, DateDeserializers.SqlDateDeserializer, DateDeserializers.TimestampDeserializer, DelegatingDeserializer, DOMDeserializer, DOMDeserializer.DocumentDeserializer, DOMDeserializer.NodeDeserializer, EnumDeserializer, EnumMapDeserializer, EnumSetDeserializer, ErrorThrowingDeserializer, FailingDeserializer, FromStringDeserializer, FromStringDeserializer.Std, JsonDeserializer, JsonDeserializer.None, JsonNodeDeserializer, MapDeserializer, MapEntryDeserializer, NioPathDeserializer, NullifyingDeserializer, NullsAsEmptyProvider, NullsConstantProvider, NullsFailProvider, NumberDeserializers.BigDecimalDeserializer, NumberDeserializers.BigIntegerDeserializer, NumberDeserializers.BooleanDeserializer, NumberDeserializers.ByteDeserializer, NumberDeserializers.CharacterDeserializer, NumberDeserializers.DoubleDeserializer, NumberDeserializers.FloatDeserializer, NumberDeserializers.IntegerDeserializer, NumberDeserializers.LongDeserializer, NumberDeserializers.NumberDeserializer, NumberDeserializers.PrimitiveOrWrapperDeserializer, NumberDeserializers.ShortDeserializer, ObjectArrayDeserializer, PrimitiveArrayDeserializers, ReferenceTypeDeserializer, StackTraceElementDeserializer, StdDelegatingDeserializer, StdDeserializer, StdNodeBasedDeserializer, StdScalarDeserializer, StringArrayDeserializer, StringCollectionDeserializer, StringDeserializer, ThrowableDeserializer, TokenBufferDeserializer, TypeWrappedDeserializer, UnsupportedTypeDeserializer, UntypedObjectDeserializer, UntypedObjectDeserializer.Vanilla, UUIDDeserializer
```
public interface NullValueProvider
```
Helper interface implemented by classes that are to be used as null providers during deserialization. Most importantly implemented by JsonDeserializer (as a mix-in interface), but also by converters used to support more configurable null replacement.

Since:

2.9

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default Object`	`getAbsentValue(DeserializationContext ctxt)` Method called to determine placeholder value to be used for cases where no value was obtained from input but we must pass a value nonetheless: the common case is that of Creator methods requiring passing a value for every parameter.
`AccessPattern`	`getNullAccessPattern()` Accessor that may be used to determine if and when provider must be called to access null replacement value.
`Object`	`getNullValue(DeserializationContext ctxt)` Method called to possibly convert incoming `null` token (read via underlying streaming input source) into other value of type accessor supports.

- Method Detail
  - getNullValue
```
Object getNullValue(DeserializationContext ctxt)
             throws JsonMappingException
```
    Method called to possibly convert incoming `null` token (read via underlying streaming input source) into other value of type accessor supports. May return `null`, or value compatible with type binding.
    NOTE: if getNullAccessPattern() returns `ALWAYS_NULL` or `CONSTANT`, this method WILL NOT use provided `ctxt` and it may thus be passed as `null`.
    
    Throws:
    
    JsonMappingException
  - getNullAccessPattern
```
AccessPattern getNullAccessPattern()
```
    Accessor that may be used to determine if and when provider must be called to access null replacement value.
  - getAbsentValue
```
default Object getAbsentValue(DeserializationContext ctxt)
                       throws JsonMappingException
```
    Method called to determine placeholder value to be used for cases where no value was obtained from input but we must pass a value nonetheless: the common case is that of Creator methods requiring passing a value for every parameter. Usually this is same as getNullValue(com.fasterxml.jackson.databind.DeserializationContext) (which in turn is usually simply Java null), but it can be overridden for specific types: most notable scalar types must use "default" values.
    This method needs to be called every time a determination is made.
    Default implementation simply calls and returns getNullValue(com.fasterxml.jackson.databind.DeserializationContext).
    
    Throws:
    
    JsonMappingException
    
    Since:
    
    2.13

Interface NullValueProvider

Method Summary

Method Detail

getNullValue

getNullAccessPattern

getAbsentValue