com.fasterxml.jackson.databind

Class AbstractTypeResolver

java.lang.Object

com.fasterxml.jackson.databind.AbstractTypeResolver

Direct Known Subclasses:

SimpleAbstractTypeResolver

public abstract class AbstractTypeResolver
extends Object

Defines interface for resolvers that can resolve abstract types into concrete ones; either by using static mappings, or possibly by materializing implementations dynamically.

Constructor Summary

Constructors

Constructor and Description
AbstractTypeResolver()

Method Summary

Methods

Modifier and Type	Method and Description
JavaType	findTypeMapping(DeserializationConfig config, JavaType type) Try to locate a subtype for given abstract type, to either resolve to a concrete type, or at least to a more-specific (and hopefully supported) abstract type, one which may have registered deserializers.
JavaType	resolveAbstractType(DeserializationConfig config, JavaType type) Method called to try to resolve an abstract type into concrete type (usually for purposes of deserializing), when no concrete implementation was found.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractTypeResolver

public AbstractTypeResolver()

Method Detail

findTypeMapping

public JavaType findTypeMapping(DeserializationConfig config,
                       JavaType type)

Try to locate a subtype for given abstract type, to either resolve to a concrete type, or at least to a more-specific (and hopefully supported) abstract type, one which may have registered deserializers. Method is called before trying to locate registered deserializers (as well as standard abstract type defaulting that core Jackson does), so it is typically implemented to add custom mappings of common abstract types (like specify which concrete implementation to use for binding Lists).

Note that this method does not necessarily have to do full resolution of bindings; that is, it is legal to return type that could be further resolved: caller is expected to keep calling this method on registered resolvers, until a concrete type is located.

Parameters:

config - Configuration in use; should always be of type DeserializationConfig

resolveAbstractType

public JavaType resolveAbstractType(DeserializationConfig config,
                           JavaType type)

Method called to try to resolve an abstract type into concrete type (usually for purposes of deserializing), when no concrete implementation was found. It will be called after checking all other possibilities, including defaulting.

Parameters:

config - Configuration in use; should always be of type DeserializationConfig

type - Type for which materialization maybe needed

Returns:

Resolved concrete type (which should retain generic type parameters of input type, if any), if resolution succeeds; null if resolver does not know how to resolve type