org.codehaus.jackson.map.jsontype

接口 TypeIdResolver

所有已知实现类:

ClassNameIdResolver, MinimalClassNameIdResolver, TypeIdResolverBase, TypeNameIdResolver

public interface TypeIdResolver

Interface that defines standard API for converting types to type identifiers and vice versa. Used by type resolvers (TypeSerializer, TypeDeserializer) for converting between type and matching id; id is stored in JSON and needed for creating instances of proper subtypes when deserializing values.

从以下版本开始:

1.5

方法概要

方法

限定符和类型	方法和说明
JsonTypeInfo.Id	getMechanism() Accessor for mechanism that this resolver uses for determining type id from type.
String	idFromValue(Object value) Method called to serialize type of the type of given value as a String to include in serialized JSON content.
String	idFromValueAndType(Object value, Class<?> suggestedType) Alternative method used for determining type from combination of value and type, using suggested type (that serializer provides) and possibly value of that type.
void	init(JavaType baseType) Method that will be called once before any type resolution calls; used to initialize instance with configuration.
JavaType	typeFromId(String id) Method called to resolve type from given type identifier.

方法详细资料

init

void init(JavaType baseType)

Method that will be called once before any type resolution calls; used to initialize instance with configuration. This is necessary since instances may be created via reflection, without ability to call specific constructor to pass in configuration settings.

参数:

baseType - Base type for which this id resolver instance is used

idFromValue

String idFromValue(Object value)

Method called to serialize type of the type of given value as a String to include in serialized JSON content.

idFromValueAndType

String idFromValueAndType(Object value,
                        Class<?> suggestedType)

Alternative method used for determining type from combination of value and type, using suggested type (that serializer provides) and possibly value of that type. Most common implementation will use suggested type as is.

从以下版本开始:

1.8

typeFromId

JavaType typeFromId(String id)

Method called to resolve type from given type identifier.

getMechanism

JsonTypeInfo.Id getMechanism()

Accessor for mechanism that this resolver uses for determining type id from type. Mostly informational; not required to be called or used.