com.fasterxml.jackson.databind.deser

Interface ContextualDeserializer

All Known Implementing Classes:

AbstractDeserializer, ArrayBlockingQueueDeserializer, AtomicReferenceDeserializer, BeanAsArrayBuilderDeserializer, BeanAsArrayDeserializer, BeanDeserializer, BeanDeserializerBase, BuilderBasedDeserializer, CollectionDeserializer, DateDeserializers.CalendarDeserializer, DateDeserializers.DateDeserializer, DateDeserializers.SqlDateDeserializer, DateDeserializers.TimestampDeserializer, DelegatingDeserializer, EnumDeserializer, EnumMapDeserializer, EnumSetDeserializer, MapDeserializer, MapEntryDeserializer, ObjectArrayDeserializer, PrimitiveArrayDeserializers, ReferenceTypeDeserializer, StdDelegatingDeserializer, StringArrayDeserializer, StringCollectionDeserializer, ThrowableDeserializer, UntypedObjectDeserializer

public interface ContextualDeserializer

Add-on interface that JsonDeserializers can implement to get a callback that can be used to create contextual (context-dependent) instances of deserializer to use for handling properties of supported type. This can be useful for deserializers that can be configured by annotations, or should otherwise have differing behavior depending on what kind of property is being deserialized.

Note that in cases where deserializer needs both contextualization and resolution -- that is, implements both this interface and ResolvableDeserializer -- resolution via ResolvableDeserializer occurs first, and contextual resolution (via this interface) later on.

Method Summary

Modifier and Type	Method and Description
JsonDeserializer<?>	createContextual(DeserializationContext ctxt, BeanProperty property) Method called to see if a different (or differently configured) deserializer is needed to deserialize values of specified property.

Method Detail

createContextual

JsonDeserializer<?> createContextual(DeserializationContext ctxt,
                                     BeanProperty property)
                              throws JsonMappingException

Method called to see if a different (or differently configured) deserializer is needed to deserialize values of specified property. Note that instance that this method is called on is typically shared one and as a result method should NOT modify this instance but rather construct and return a new instance. This instance should only be returned as-is, in case it is already suitable for use.

Parameters:

ctxt - Deserialization context to access configuration, additional deserializers that may be needed by this deserializer

property - Method, field or constructor parameter that represents the property (and is used to assign deserialized value). Should be available; but there may be cases where caller cannot provide it and null is passed instead (in which case impls usually pass 'this' deserializer as is)

Returns:

Deserializer to use for deserializing values of specified property; may be this instance or a new instance.

Throws:

JsonMappingException