public class MapEntryDeserializer extends ContainerDeserializerBase<Map.Entry<Object,Object>> implements ContextualDeserializer
Map
instance, with typed contents.
Note: for untyped content (one indicated by passing Object.class
as the type), UntypedObjectDeserializer
is used instead.
It can also construct Map
s, but not with specific
POJO types, only other containers and primitives/wrappers.
JsonDeserializer.None
Modifier and Type | Field and Description |
---|---|
protected KeyDeserializer |
_keyDeserializer
Key deserializer to use; either passed via constructor
(when indicated by annotations), or resolved when
createContextual(com.fasterxml.jackson.databind.DeserializationContext, com.fasterxml.jackson.databind.BeanProperty) is called; |
protected JavaType |
_type |
protected JsonDeserializer<Object> |
_valueDeserializer
Value deserializer.
|
protected TypeDeserializer |
_valueTypeDeserializer
If value instances have polymorphic type information, this
is the type deserializer that can handle it
|
_valueClass
Modifier | Constructor and Description |
---|---|
|
MapEntryDeserializer(JavaType type,
KeyDeserializer keyDeser,
JsonDeserializer<Object> valueDeser,
TypeDeserializer valueTypeDeser) |
protected |
MapEntryDeserializer(MapEntryDeserializer src)
Copy-constructor that can be used by sub-classes to allow
copy-on-write styling copying of settings of an existing instance.
|
protected |
MapEntryDeserializer(MapEntryDeserializer src,
KeyDeserializer keyDeser,
JsonDeserializer<Object> valueDeser,
TypeDeserializer valueTypeDeser) |
Modifier and Type | Method and Description |
---|---|
JsonDeserializer<?> |
createContextual(DeserializationContext ctxt,
BeanProperty property)
Method called to finalize setup of this deserializer,
when it is known for which property deserializer is needed for.
|
Map.Entry<Object,Object> |
deserialize(com.fasterxml.jackson.core.JsonParser jp,
DeserializationContext ctxt)
Method that can be called to ask implementation to deserialize
JSON content into the value type this serializer handles.
|
Map.Entry<Object,Object> |
deserialize(com.fasterxml.jackson.core.JsonParser jp,
DeserializationContext ctxt,
Map.Entry<Object,Object> result)
Alternate deserialization method (compared to the most commonly
used,
JsonDeserializer.deserialize(JsonParser, DeserializationContext) ),
which takes in initialized value instance, to be
configured and/or populated by deserializer. |
Object |
deserializeWithType(com.fasterxml.jackson.core.JsonParser jp,
DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
Base implementation that does not assume specific type
inclusion mechanism.
|
JsonDeserializer<Object> |
getContentDeserializer()
Accesor for deserializer use for deserializing content values.
|
JavaType |
getContentType()
Accessor for declared type of contained value elements; either exact
type, or one of its supertypes.
|
JavaType |
getValueType()
Exact structured type deserializer handles, if known.
|
protected MapEntryDeserializer |
withResolved(KeyDeserializer keyDeser,
TypeDeserializer valueTypeDeser,
JsonDeserializer<?> valueDeser)
Fluent factory method used to create a copy with slightly
different settings.
|
findBackReference, wrapAndThrow
_deserializeFromEmpty, _hasTextualNull, _isNaN, _isNegInf, _isPosInf, _parseBoolean, _parseBooleanFromNumber, _parseBooleanPrimitive, _parseByte, _parseDate, _parseDouble, _parseDoublePrimitive, _parseFloat, _parseFloatPrimitive, _parseInteger, _parseIntPrimitive, _parseLong, _parseLongPrimitive, _parseShort, _parseShortPrimitive, _parseString, findConvertingContentDeserializer, findDeserializer, getValueClass, handledType, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer, parseDouble
getDelegatee, getEmptyValue, getKnownPropertyNames, getNullValue, getObjectIdReader, isCachable, replaceDelegatee, unwrappingDeserializer
protected final JavaType _type
protected final KeyDeserializer _keyDeserializer
createContextual(com.fasterxml.jackson.databind.DeserializationContext, com.fasterxml.jackson.databind.BeanProperty)
is called;protected final JsonDeserializer<Object> _valueDeserializer
protected final TypeDeserializer _valueTypeDeserializer
public MapEntryDeserializer(JavaType type, KeyDeserializer keyDeser, JsonDeserializer<Object> valueDeser, TypeDeserializer valueTypeDeser)
protected MapEntryDeserializer(MapEntryDeserializer src)
protected MapEntryDeserializer(MapEntryDeserializer src, KeyDeserializer keyDeser, JsonDeserializer<Object> valueDeser, TypeDeserializer valueTypeDeser)
protected MapEntryDeserializer withResolved(KeyDeserializer keyDeser, TypeDeserializer valueTypeDeser, JsonDeserializer<?> valueDeser)
public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException
createContextual
in interface ContextualDeserializer
ctxt
- Deserialization context to access configuration, additional
deserializers that may be needed by this deserializerproperty
- 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 can not provide it and
null is passed instead (in which case impls usually pass 'this' deserializer as is)JsonMappingException
public JavaType getContentType()
ContainerDeserializerBase
getContentType
in class ContainerDeserializerBase<Map.Entry<Object,Object>>
public JsonDeserializer<Object> getContentDeserializer()
ContainerDeserializerBase
getContentDeserializer
in class ContainerDeserializerBase<Map.Entry<Object,Object>>
public Map.Entry<Object,Object> deserialize(com.fasterxml.jackson.core.JsonParser jp, DeserializationContext ctxt) throws IOException
JsonDeserializer
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.
deserialize
in class JsonDeserializer<Map.Entry<Object,Object>>
jp
- Parsed used for reading JSON contentctxt
- Context that can be used to access information about
this deserialization activity.IOException
public Map.Entry<Object,Object> deserialize(com.fasterxml.jackson.core.JsonParser jp, DeserializationContext ctxt, Map.Entry<Object,Object> result) throws IOException
JsonDeserializer
JsonDeserializer.deserialize(JsonParser, DeserializationContext)
),
which takes in initialized value instance, to be
configured and/or populated by deserializer.
Method is not necessarily used (or supported) by all types
(it will not work for immutable types, for obvious reasons):
most commonly it is used for Collections and Maps.
It may be used both with "updating readers" (for POJOs) and
when Collections and Maps use "getter as setter".
Default implementation just throws
UnsupportedOperationException
, to indicate that types
that do not explicitly add support do not necessarily support
update-existing-value operation (esp. immutable types)
deserialize
in class JsonDeserializer<Map.Entry<Object,Object>>
IOException
public Object deserializeWithType(com.fasterxml.jackson.core.JsonParser jp, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException, com.fasterxml.jackson.core.JsonProcessingException
StdDeserializer
deserializeWithType
in class StdDeserializer<Map.Entry<Object,Object>>
typeDeserializer
- Deserializer to use for handling type informationIOException
com.fasterxml.jackson.core.JsonProcessingException
public JavaType getValueType()
StdDeserializer
Default implementation just returns null.
getValueType
in class StdDeserializer<Map.Entry<Object,Object>>
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