com.fasterxml.jackson.annotation

Annotation Type JsonDeserializeAs

@Target(value={ANNOTATION_TYPE,METHOD,FIELD,TYPE,PARAMETER})
 @Retention(value=RUNTIME)
public @interface JsonDeserializeAs

Annotation to indicate override of deserialization target type; a more specialized type (sub-type) than declared one. Can be used on types (Classes) or on properties (property accessors like "getters", "setters" and constructor parameters). Overrides can apply to:

• value itself (for all types and properties)
• content of structured types (array and Collection elements; Map values)
• keys of Maps

To indicate that no override is to be used, Void.class is used as the marker (will use declared type) -- this is necessary as Annotation properties cannot have null values.

Example usage:

 public class POJO {
   @JsonDeserializeAs(ValueImpl.class)
   public Value value;

   @JsonDeserializeAs(keys = KeyEnum.class, content = ValueImpl.class)
   public Map<Object, Object> props;
 }

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
Class<?>	content Type to deserialize content entries (array and Collection elements, Map values) as, instead of type declared.
Class<?>	keys Type to deserialize Map keys as, instead of type declared.
Class<?>	value Type to deserialize values as, instead of type declared.

Element Detail

value

public abstract Class<?> value

Type to deserialize values as, instead of type declared. Must be a sub-type of declared type; otherwise an exception may be thrown by deserializer.

Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).

Default:

java.lang.Void.class

content

public abstract Class<?> content

Type to deserialize content entries (array and Collection elements, Map values) as, instead of type declared. Must be a sub-type of declared type; otherwise an exception may be thrown by deserializer.

Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).

Default:

java.lang.Void.class

keys

public abstract Class<?> keys

Type to deserialize Map keys as, instead of type declared. Must be a sub-type of declared type; otherwise an exception may be thrown by deserializer.

Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).

Default:

java.lang.Void.class