public class AbstractDeserializer extends JsonDeserializer<Object> implements ContextualDeserializer, Serializable
TypeDeserializer
; and any calls that do not
pass such resolver will result in an error.JsonDeserializer.None
Modifier and Type | Field and Description |
---|---|
protected boolean |
_acceptBoolean |
protected boolean |
_acceptDouble |
protected boolean |
_acceptInt |
protected boolean |
_acceptString |
protected Map<String,SettableBeanProperty> |
_backRefProperties |
protected JavaType |
_baseType |
protected ObjectIdReader |
_objectIdReader |
protected Map<String,SettableBeanProperty> |
_properties |
Modifier | Constructor and Description |
---|---|
protected |
AbstractDeserializer(AbstractDeserializer base,
ObjectIdReader objectIdReader,
Map<String,SettableBeanProperty> props) |
protected |
AbstractDeserializer(BeanDescription beanDesc) |
|
AbstractDeserializer(BeanDeserializerBuilder builder,
BeanDescription beanDesc,
Map<String,SettableBeanProperty> backRefProps)
Deprecated.
|
|
AbstractDeserializer(BeanDeserializerBuilder builder,
BeanDescription beanDesc,
Map<String,SettableBeanProperty> backRefProps,
Map<String,SettableBeanProperty> props) |
Modifier and Type | Method and Description |
---|---|
protected Object |
_deserializeFromObjectId(JsonParser p,
DeserializationContext ctxt)
Method called in cases where it looks like we got an Object Id
to parse and use as a reference.
|
protected Object |
_deserializeIfNatural(JsonParser p,
DeserializationContext ctxt) |
static AbstractDeserializer |
constructForNonPOJO(BeanDescription beanDesc)
Factory method used when constructing instances for non-POJO types, like
Map s. |
JsonDeserializer<?> |
createContextual(DeserializationContext ctxt,
BeanProperty property)
Method called to see if a different (or differently configured) deserializer
is needed to deserialize values of specified property.
|
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.
|
Object |
deserializeWithType(JsonParser p,
DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
Deserialization called when type being deserialized is defined to
contain additional type identifier, to allow for correctly
instantiating correct subtype.
|
SettableBeanProperty |
findBackReference(String logicalName)
Method called by
BeanDeserializer to resolve back reference
part of managed references. |
ObjectIdReader |
getObjectIdReader()
Overridden to return true for those instances that are
handling value for which Object Identity handling is enabled
(either via value type or referring property).
|
Class<?> |
handledType()
Method for accessing type of values this deserializer produces.
|
boolean |
isCachable()
Method called to see if deserializer instance is cachable and
usable for other properties of same type (type for which instance
was created).
|
Boolean |
supportsUpdate(DeserializationConfig config)
Introspection method that may be called to see whether deserializer supports
update of an existing value (aka "merging") or not.
|
deserialize, getDelegatee, getEmptyAccessPattern, getEmptyValue, getEmptyValue, getKnownPropertyNames, getNullAccessPattern, getNullValue, getNullValue, replaceDelegatee, unwrappingDeserializer
protected final JavaType _baseType
protected final ObjectIdReader _objectIdReader
protected final Map<String,SettableBeanProperty> _backRefProperties
protected transient Map<String,SettableBeanProperty> _properties
protected final boolean _acceptString
protected final boolean _acceptBoolean
protected final boolean _acceptInt
protected final boolean _acceptDouble
public AbstractDeserializer(BeanDeserializerBuilder builder, BeanDescription beanDesc, Map<String,SettableBeanProperty> backRefProps, Map<String,SettableBeanProperty> props)
props
- Regular properties: currently only needed to support property-annotated
Object Id handling with property inclusion (needed for determining type of Object Id
to bind)@Deprecated public AbstractDeserializer(BeanDeserializerBuilder builder, BeanDescription beanDesc, Map<String,SettableBeanProperty> backRefProps)
protected AbstractDeserializer(BeanDescription beanDesc)
protected AbstractDeserializer(AbstractDeserializer base, ObjectIdReader objectIdReader, Map<String,SettableBeanProperty> props)
public static AbstractDeserializer constructForNonPOJO(BeanDescription beanDesc)
Map
s.public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException
ContextualDeserializer
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 cannot provide it and
null is passed instead (in which case impls usually pass 'this' deserializer as is)JsonMappingException
public Class<?> handledType()
JsonDeserializer
Default implementation will return null, which means almost same
same as returning Object.class
would; that is, that
nothing is known about handled type.
handledType
in class JsonDeserializer<Object>
public boolean isCachable()
JsonDeserializer
Note that cached instances are still resolved on per-property basis,
if instance implements ResolvableDeserializer
:
cached instance is just as the base. This means that in most cases it is safe to
cache instances; however, it only makes sense to cache instances
if instantiation is expensive, or if instances are heavy-weight.
Default implementation returns false, to indicate that no caching is done.
isCachable
in class JsonDeserializer<Object>
public Boolean supportsUpdate(DeserializationConfig config)
JsonDeserializer
Boolean.FALSE
if update is not supported at all (immutable values);
Boolean.TRUE
if update should usually work (regular POJOs, for example),
or null
if this is either not known, or may sometimes work.
Information gathered is typically used to either prevent merging update for
property (either by skipping, if based on global defaults; or by exception during
deserialization construction if explicit attempt made) if Boolean.FALSE
returned, or inclusion if Boolean.TRUE
is specified. If "unknown" case
(null
returned) behavior is to exclude property if global defaults
used; or to allow if explicit per-type or property merging is defined.
Default implementation returns null
to allow explicit per-type
or per-property attempts.
supportsUpdate
in class JsonDeserializer<Object>
public ObjectIdReader getObjectIdReader()
getObjectIdReader
in class JsonDeserializer<Object>
public SettableBeanProperty findBackReference(String logicalName)
BeanDeserializer
to resolve back reference
part of managed references.findBackReference
in class JsonDeserializer<Object>
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException
JsonDeserializer
Default implementation may work for some types, but ideally subclasses should not rely on current default implementation. Implementation is mostly provided to avoid compilation errors with older code.
deserializeWithType
in class JsonDeserializer<Object>
typeDeserializer
- Deserializer to use for handling type informationIOException
public Object deserialize(JsonParser p, 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 (p.getCurrentToken() == JsonToken.START_OBJECT) { p.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<Object>
p
- Parsed used for reading JSON contentctxt
- Context that can be used to access information about
this deserialization activity.IOException
protected Object _deserializeIfNatural(JsonParser p, DeserializationContext ctxt) throws IOException
IOException
protected Object _deserializeFromObjectId(JsonParser p, DeserializationContext ctxt) throws IOException
IOException
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