com.fasterxml.jackson.databind.deser.std

Class EnumDeserializer

java.lang.Object

com.fasterxml.jackson.databind.JsonDeserializer<T>

com.fasterxml.jackson.databind.deser.std.StdDeserializer<T>

com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer<Object>

com.fasterxml.jackson.databind.deser.std.EnumDeserializer

All Implemented Interfaces:

Serializable

public class EnumDeserializer
extends StdScalarDeserializer<Object>

Deserializer class that can deserialize instances of specified Enum class from Strings and Integers.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonDeserializer

JsonDeserializer.None

Field Summary

Fields

Modifier and Type	Field and Description
protected Object[]	_enumsByIndex
protected CompactStringObjectMap	_lookupByName
protected CompactStringObjectMap	_lookupByToString Alternatively, we may need a different lookup object if "use toString" is defined.

Fields inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

_valueClass, F_MASK_INT_COERCIONS

Constructor Summary

Constructors

Constructor and Description
EnumDeserializer(EnumResolver byNameResolver)

Method Summary

Methods

Modifier and Type	Method and Description
protected Object	_deserializeOther(JsonParser p, DeserializationContext ctxt)
protected Class<?>	_enumClass()
protected CompactStringObjectMap	_getToStringLookup(DeserializationContext ctxt)
Object	deserialize(JsonParser p, DeserializationContext ctxt) Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles.
static JsonDeserializer<?>	deserializerForCreator(DeserializationConfig config, Class<?> enumClass, AnnotatedMethod factory) Deprecated. Since 2.8
static JsonDeserializer<?>	deserializerForCreator(DeserializationConfig config, Class<?> enumClass, AnnotatedMethod factory, ValueInstantiator valueInstantiator, SettableBeanProperty[] creatorProps) Factory method used when Enum instances are to be deserialized using a creator (static factory method)
static JsonDeserializer<?>	deserializerForNoArgsCreator(DeserializationConfig config, Class<?> enumClass, AnnotatedMethod factory) Factory method used when Enum instances are to be deserialized using a zero-/no-args factory method
boolean	isCachable() Because of costs associated with constructing Enum resolvers, let's cache instances by default.

Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer

deserializeWithType

Methods inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

_coerceIntegral, _deserializeFromEmpty, _failDoubleToIntCoercion, _hasTextualNull, _isIntNumber, _isNaN, _isNegInf, _isPosInf, _parseBoolean, _parseBooleanFromOther, _parseBooleanPrimitive, _parseByte, _parseDate, _parseDate, _parseDouble, _parseDoublePrimitive, _parseFloat, _parseFloatPrimitive, _parseInteger, _parseIntPrimitive, _parseLong, _parseLongPrimitive, _parseShort, _parseShortPrimitive, _parseString, findConvertingContentDeserializer, findDeserializer, findFormatFeature, findFormatOverrides, getValueClass, getValueType, handledType, handleMissingEndArrayForSingle, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer, parseDouble

Methods inherited from class com.fasterxml.jackson.databind.JsonDeserializer

deserialize, findBackReference, getDelegatee, getEmptyValue, getEmptyValue, getKnownPropertyNames, getNullValue, getNullValue, getObjectIdReader, replaceDelegatee, unwrappingDeserializer

Methods inherited from class java.lang.Object

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

Field Detail

_enumsByIndex

protected Object[] _enumsByIndex

_lookupByName

protected final CompactStringObjectMap _lookupByName

Since:

2.7.3

_lookupByToString

protected CompactStringObjectMap _lookupByToString

Alternatively, we may need a different lookup object if "use toString" is defined.

Since:

2.7.3

Constructor Detail

EnumDeserializer

public EnumDeserializer(EnumResolver byNameResolver)

Method Detail

deserializerForCreator

@Deprecated
public static JsonDeserializer<?> deserializerForCreator(DeserializationConfig config,
                                                    Class<?> enumClass,
                                                    AnnotatedMethod factory)

Deprecated. Since 2.8

deserializerForCreator

public static JsonDeserializer<?> deserializerForCreator(DeserializationConfig config,
                                         Class<?> enumClass,
                                         AnnotatedMethod factory,
                                         ValueInstantiator valueInstantiator,
                                         SettableBeanProperty[] creatorProps)

Factory method used when Enum instances are to be deserialized using a creator (static factory method)

Returns:

Deserializer based on given factory method

Since:

2.8

deserializerForNoArgsCreator

public static JsonDeserializer<?> deserializerForNoArgsCreator(DeserializationConfig config,
                                               Class<?> enumClass,
                                               AnnotatedMethod factory)

Factory method used when Enum instances are to be deserialized using a zero-/no-args factory method

Returns:

Deserializer based on given no-args factory method

Since:

2.8

isCachable

public boolean isCachable()

Because of costs associated with constructing Enum resolvers, let's cache instances by default.

Overrides:

isCachable in class JsonDeserializer<Object>

deserialize

public Object deserialize(JsonParser p,
                 DeserializationContext ctxt)
                   throws IOException

Description copied from class: JsonDeserializer

Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles. Returned instance is to be constructed by method itself.

Pre-condition for this method is that the parser points to the first event that is part of value to deserializer (and which is never JSON 'null' literal, more on this below): for simple types it may be the only value; and for structured types the Object start marker or a FIELD_NAME.

The two possible input conditions for structured types result from polymorphism via fields. In the ordinary case, Jackson calls this method when it has encountered an OBJECT_START, and the method implementation must advance to the next token to see the first field name. If the application configures polymorphism via a field, then the object looks like the following.

      {
          "@class": "class name",
          ...
      }
  

Jackson consumes the two tokens (the @class field name and its value) in order to learn the class and select the deserializer. Thus, the stream is pointing to the FIELD_NAME for the first field after the @class. Thus, if you want your method to work correctly both with and without polymorphism, you must begin your method with:

       if (jp.getCurrentToken() == JsonToken.START_OBJECT) {
         jp.nextToken();
       }
  

This results in the stream pointing to the field name, so that the two conditions align.

Post-condition is that the parser will point to the last event that is part of deserialized value (or in case deserialization fails, event that was not recognized or usable, which may be the same event as the one it pointed to upon call).

Note that this method is never called for JSON null literal, and thus deserializers need (and should) not check for it.

Specified by:

deserialize in class JsonDeserializer<Object>

Parameters:

p - Parsed used for reading JSON content

ctxt - Context that can be used to access information about this deserialization activity.

Returns:

Deserialized value

Throws:

IOException

_deserializeOther

protected Object _deserializeOther(JsonParser p,
                       DeserializationContext ctxt)
                            throws IOException

Throws:

IOException

_enumClass

protected Class<?> _enumClass()

_getToStringLookup

protected CompactStringObjectMap _getToStringLookup(DeserializationContext ctxt)