public class CollectionDeserializer extends ContainerDeserializerBase<Collection<Object>> implements ContextualDeserializer
Collection 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 Lists, but not with specific
POJO types, only other containers and primitives/wrappers.
| Modifier and Type | Class and Description |
|---|---|
static class |
CollectionDeserializer.CollectionReferringAccumulator |
JsonDeserializer.None| Modifier and Type | Field and Description |
|---|---|
protected JavaType |
_collectionType |
protected JsonDeserializer<Object> |
_delegateDeserializer
Deserializer that is used iff delegate-based creator is
to be used for deserializing from JSON Object.
|
protected JsonDeserializer<Object> |
_valueDeserializer
Value deserializer.
|
protected ValueInstantiator |
_valueInstantiator |
protected TypeDeserializer |
_valueTypeDeserializer
If element instances have polymorphic type information, this
is the type deserializer that can handle it
|
_valueClass| Modifier | Constructor and Description |
|---|---|
protected |
CollectionDeserializer(CollectionDeserializer src)
Copy-constructor that can be used by sub-classes to allow
copy-on-write styling copying of settings of an existing instance.
|
|
CollectionDeserializer(JavaType collectionType,
JsonDeserializer<Object> valueDeser,
TypeDeserializer valueTypeDeser,
ValueInstantiator valueInstantiator)
Constructor for context-free instances, where we do not yet know
which property is using this deserializer.
|
protected |
CollectionDeserializer(JavaType collectionType,
JsonDeserializer<Object> valueDeser,
TypeDeserializer valueTypeDeser,
ValueInstantiator valueInstantiator,
JsonDeserializer<Object> delegateDeser)
Constructor used when creating contextualized instances.
|
| Modifier and Type | Method and Description |
|---|---|
CollectionDeserializer |
createContextual(DeserializationContext ctxt,
BeanProperty property)
Method called to finalize setup of this deserializer,
when it is known for which property deserializer is needed
for.
|
Collection<Object> |
deserialize(JsonParser jp,
DeserializationContext ctxt)
Method that can be called to ask implementation to deserialize
JSON content into the value type this serializer handles.
|
Collection<Object> |
deserialize(JsonParser jp,
DeserializationContext ctxt,
Collection<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(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.
|
protected Collection<Object> |
handleNonArray(JsonParser jp,
DeserializationContext ctxt,
Collection<Object> result)
Helper method called when current token is no START_ARRAY.
|
protected CollectionDeserializer |
withResolved(JsonDeserializer<?> dd,
JsonDeserializer<?> vd,
TypeDeserializer vtd)
Fluent-factory method call to construct contextual instance.
|
findBackReference_hasTextualNull, _isNaN, _isNegInf, _isPosInf, _parseBoolean, _parseBooleanFromNumber, _parseBooleanPrimitive, _parseByte, _parseDate, _parseDouble, _parseDoublePrimitive, _parseFloat, _parseFloatPrimitive, _parseInteger, _parseIntPrimitive, _parseLong, _parseLongPrimitive, _parseShort, _parseShortPrimitive, _parseString, findConvertingContentDeserializer, findDeserializer, getValueClass, getValueType, handledType, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer, parseDoublegetDelegatee, getEmptyValue, getKnownPropertyNames, getNullValue, getObjectIdReader, isCachable, replaceDelegatee, unwrappingDeserializerprotected final JavaType _collectionType
protected final JsonDeserializer<Object> _valueDeserializer
protected final TypeDeserializer _valueTypeDeserializer
protected final ValueInstantiator _valueInstantiator
protected final JsonDeserializer<Object> _delegateDeserializer
public CollectionDeserializer(JavaType collectionType, JsonDeserializer<Object> valueDeser, TypeDeserializer valueTypeDeser, ValueInstantiator valueInstantiator)
protected CollectionDeserializer(JavaType collectionType, JsonDeserializer<Object> valueDeser, TypeDeserializer valueTypeDeser, ValueInstantiator valueInstantiator, JsonDeserializer<Object> delegateDeser)
protected CollectionDeserializer(CollectionDeserializer src)
protected CollectionDeserializer withResolved(JsonDeserializer<?> dd, JsonDeserializer<?> vd, TypeDeserializer vtd)
public CollectionDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException
createContextual in interface ContextualDeserializerctxt - 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)JsonMappingExceptionpublic JavaType getContentType()
ContainerDeserializerBasegetContentType in class ContainerDeserializerBase<Collection<Object>>public JsonDeserializer<Object> getContentDeserializer()
ContainerDeserializerBasegetContentDeserializer in class ContainerDeserializerBase<Collection<Object>>public Collection<Object> deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException
JsonDeserializerPre-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<Collection<Object>>jp - Parsed used for reading JSON contentctxt - Context that can be used to access information about
this deserialization activity.IOExceptionJsonProcessingExceptionpublic Collection<Object> deserialize(JsonParser jp, DeserializationContext ctxt, Collection<Object> result) throws IOException, JsonProcessingException
JsonDeserializerJsonDeserializer.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<Collection<Object>>IOExceptionJsonProcessingExceptionpublic Object deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException, JsonProcessingException
StdDeserializerdeserializeWithType in class StdDeserializer<Collection<Object>>typeDeserializer - Deserializer to use for handling type informationIOExceptionJsonProcessingExceptionprotected final Collection<Object> handleNonArray(JsonParser jp, DeserializationContext ctxt, Collection<Object> result) throws IOException, JsonProcessingException
IOExceptionJsonProcessingExceptionCopyright © 2014-2015 FasterXML. All Rights Reserved.