T - Target type of this deserializer; that is, type of values that
input data is deserialized into.public abstract class StdNodeBasedDeserializer<T> extends StdDeserializer<T> implements ResolvableDeserializer
JsonNode).
Note that this is a slightly simplified alternative to StdDelegatingDeserializer).JsonDeserializer.None| Modifier and Type | Field and Description |
|---|---|
protected JsonDeserializer<Object> |
_treeDeserializer |
_valueClass, _valueType, F_MASK_ACCEPT_ARRAYS, F_MASK_INT_COERCIONS| Modifier | Constructor and Description |
|---|---|
protected |
StdNodeBasedDeserializer(Class<T> targetType) |
protected |
StdNodeBasedDeserializer(JavaType targetType) |
protected |
StdNodeBasedDeserializer(StdNodeBasedDeserializer<?> src)
"Copy-constructor" used when creating a modified copies, most often
if sub-class implements
ContextualDeserializer. |
| Modifier and Type | Method and Description |
|---|---|
abstract T |
convert(JsonNode root,
DeserializationContext ctxt) |
T |
deserialize(JsonParser jp,
DeserializationContext ctxt)
Method that can be called to ask implementation to deserialize
JSON content into the value type this serializer handles.
|
Object |
deserializeWithType(JsonParser jp,
DeserializationContext ctxt,
TypeDeserializer td)
Base implementation that does not assume specific type
inclusion mechanism.
|
void |
resolve(DeserializationContext ctxt)
Method called after deserializer instance has been constructed
(and registered as necessary by provider objects),
but before it has returned it to the caller.
|
_byteOverflow, _coercedTypeDesc, _coerceEmptyString, _coerceIntegral, _coerceNullToken, _coerceTextualNull, _deserializeFromArray, _deserializeFromEmpty, _deserializeWrappedValue, _failDoubleToIntCoercion, _findNullProvider, _hasTextualNull, _intOverflow, _isEmptyOrTextualNull, _isIntNumber, _isNaN, _isNegInf, _isPosInf, _neitherNull, _nonNullNumber, _parseBooleanFromInt, _parseBooleanPrimitive, _parseBytePrimitive, _parseDate, _parseDate, _parseDateFromArray, _parseDoublePrimitive, _parseDoublePrimitive, _parseFloatPrimitive, _parseFloatPrimitive, _parseIntPrimitive, _parseIntPrimitive, _parseLongPrimitive, _parseLongPrimitive, _parseShortPrimitive, _parseString, _reportFailedNullCoerce, _shortOverflow, _verifyEndArrayForSingle, _verifyNullForPrimitive, _verifyNullForPrimitiveCoercion, _verifyNullForScalarCoercion, _verifyNumberForScalarCoercion, _verifyStringForScalarCoercion, findContentNullProvider, findContentNullStyle, findConvertingContentDeserializer, findDeserializer, findFormatFeature, findFormatOverrides, findValueNullProvider, getValueClass, getValueType, getValueType, handledType, handleMissingEndArrayForSingle, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer, parseDoubledeserialize, deserializeWithType, findBackReference, getDelegatee, getEmptyAccessPattern, getEmptyValue, getEmptyValue, getKnownPropertyNames, getNullAccessPattern, getNullValue, getNullValue, getObjectIdReader, isCachable, replaceDelegatee, supportsUpdate, unwrappingDeserializerprotected JsonDeserializer<Object> _treeDeserializer
protected StdNodeBasedDeserializer(JavaType targetType)
protected StdNodeBasedDeserializer(StdNodeBasedDeserializer<?> src)
ContextualDeserializer.public void resolve(DeserializationContext ctxt) throws JsonMappingException
ResolvableDeserializerresolve in interface ResolvableDeserializerctxt - Context to use for accessing configuration, resolving
secondary deserializersJsonMappingExceptionpublic abstract T convert(JsonNode root, DeserializationContext ctxt) throws IOException
IOExceptionpublic T deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException
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 (p.currentToken() == 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<T>jp - Parsed used for reading JSON contentctxt - Context that can be used to access information about
this deserialization activity.IOExceptionpublic Object deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer td) throws IOException, JsonProcessingException
StdDeserializerdeserializeWithType in class StdDeserializer<T>td - Deserializer to use for handling type informationIOExceptionJsonProcessingExceptionCopyright © 2008–2020 FasterXML. All rights reserved.