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tools.jackson.databind.deser.std

public abstract Class StdNodeBasedDeserializer<T>

extends StdDeserializer<T>
Class Inheritance
Known Direct Subclasses
tools.jackson.databind.deser.jdk.ThreadGroupDeserializer
Type Parameters
<T>
Target type of this deserializer; that is, type of values that input data is deserialized into.
Imports
tools.jackson.core.*, tools.jackson.databind.*, tools.jackson.databind.jsontype.TypeDeserializer
Convenience deserializer that may be used to deserialize values given an intermediate tree representation (JsonNode). Note that this is a slightly simplified alternative to StdConvertingDeserializer).

Field Summary

Modifier and TypeField and Description
protected ValueDeserializer<Object>
_treeDeserializer

Inherited from tools.jackson.databind.deser.std.StdDeserializer:
_valueClass_valueTypeF_MASK_INT_COERCIONS

Constructor Summary

AccessConstructor and Description
protected
StdNodeBasedDeserializer(JavaType targetType)

protected
StdNodeBasedDeserializer(Class<T> targetType)

protected
StdNodeBasedDeserializer(StdNodeBasedDeserializer<?> src)

"Copy-constructor" used when creating a modified copies, most often if sub-class overrides tools.jackson.databind.ValueDeserializer#createContextual.

Method Summary

Modifier and TypeMethod and Description
public abstract T
convert(JsonNode root, DeserializationContext ctxt)

public T
convert(JsonNode root, DeserializationContext ctxt, T newValue)

Facilitates usage with ObjectMapper#readerForUpdating(Object) and deserialize(JsonParser, DeserializationContext, Object) by eliminating the need to manually convert the value to a JsonNode.

public T
deserialize(JsonParser p, DeserializationContext ctxt)

Implements abstract tools.jackson.databind.ValueDeserializer.deserialize.

Method that can be called to ask implementation to deserialize JSON content into the value type this serializer handles.

public T
deserialize(JsonParser jp, DeserializationContext ctxt, T newValue)

Overrides tools.jackson.databind.ValueDeserializer.deserialize.

Added to support convert(JsonNode, DeserializationContext, Object)

public Object
deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer td)

Overrides tools.jackson.databind.deser.std.StdDeserializer.deserializeWithType.

Base implementation that does not assume specific type inclusion mechanism.

public void
resolve(DeserializationContext ctxt)

Overrides tools.jackson.databind.ValueDeserializer.resolve.

Method called after deserializer instance has been constructed (and registered as necessary by provider objects), but before it has returned it to the caller.

Inherited from tools.jackson.databind.deser.std.StdDeserializer:
_byteOverflow_checkBooleanToStringCoercion_checkCoercionFail_checkDoubleSpecialValue_checkFloatSpecialValue_checkFloatToIntCoercion_checkFloatToStringCoercion_checkFromStringCoercion_checkFromStringCoercion_checkIntToFloatCoercion_checkIntToStringCoercion_checkTextualNull_checkToStringCoercion_coerceBooleanFromInt_coercedTypeDesc_coercedTypeDesc_coerceIntegral_deserializeFromArray_deserializeFromEmptyString_deserializeFromString_deserializeWrappedValue_findCoercionFromBlankString_findCoercionFromEmptyArray_findCoercionFromEmptyString_findNullProvider_hasTextualNull_intOverflow_isBlank_isFalse_isIntNumber_isNaN_isNegInf_isPosInf_isTrue_neitherNull_nonNullNumber_parseBoolean_parseBooleanPrimitive_parseBytePrimitive_parseDate_parseDate_parseDateFromArray_parseDouble_parseDoublePrimitive_parseDoublePrimitive_parseFloatPrimitive_parseFloatPrimitive_parseInteger_parseInteger_parseIntPrimitive_parseIntPrimitive_parseLong_parseLong_parseLongPrimitive_parseLongPrimitive_parseShortPrimitive_parseString_reportFailedNullCoerce_shortOverflow_verifyEndArrayForSingle_verifyNullForPrimitive_verifyNullForPrimitiveCoercion_wrapIOFailurefindContentNullProviderfindContentNullStylefindConvertingContentDeserializerfindDeserializerfindFormatFeaturefindFormatOverridesfindValueNullProvidergetValueInstantiatorgetValueTypegetValueTypehandledTypehandleMissingEndArrayForSinglehandleNestedArrayForSinglehandleUnknownPropertyisDefaultDeserializerisDefaultKeyDeserializer

Field Detail

_treeDeserializerback to summary
protected ValueDeserializer<Object> _treeDeserializer

Constructor Detail

StdNodeBasedDeserializerback to summary
protected StdNodeBasedDeserializer(JavaType targetType)
StdNodeBasedDeserializerback to summary
protected StdNodeBasedDeserializer(Class<T> targetType)
StdNodeBasedDeserializerback to summary
protected StdNodeBasedDeserializer(StdNodeBasedDeserializer<?> src)

"Copy-constructor" used when creating a modified copies, most often if sub-class overrides tools.jackson.databind.ValueDeserializer#createContextual.

Method Detail

convertback to summary
public abstract T convert(JsonNode root, DeserializationContext ctxt) throws JacksonException
convertback to summary
public T convert(JsonNode root, DeserializationContext ctxt, T newValue) throws JacksonException

Facilitates usage with ObjectMapper#readerForUpdating(Object) and deserialize(JsonParser, DeserializationContext, Object) by eliminating the need to manually convert the value to a JsonNode. If this method is not overridden, it falls back to the behavior of convert(JsonNode, DeserializationContext).

Since
2.15
deserializeback to summary
public T deserialize(JsonParser p, DeserializationContext ctxt) throws JacksonException

Implements abstract tools.jackson.databind.ValueDeserializer.deserialize.

Doc from tools.jackson.databind.ValueDeserializer.deserialize.

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 (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).

Handling null values (JsonToken.VALUE_NULL)
: Note that this method is never called for the JSON null literal to avoid every deserializer from having to handle null values. Instead, the ValueDeserializer#getNullValue(DeserializationContext) method is called to produce a null value. To influence null handling, custom deserializers should override ValueDeserializer#getNullValue(DeserializationContext) and usually also ValueDeserializer#getNullAccessPattern().

Annotations
@Override
deserializeback to summary
public T deserialize(JsonParser jp, DeserializationContext ctxt, T newValue) throws JacksonException

Overrides tools.jackson.databind.ValueDeserializer.deserialize.

Added to support convert(JsonNode, DeserializationContext, Object)

Annotations
@Override
Since
2.15
deserializeWithTypeback to summary
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer td) throws JacksonException

Overrides tools.jackson.databind.deser.std.StdDeserializer.deserializeWithType.

Doc from tools.jackson.databind.deser.std.StdDeserializer.deserializeWithType.

Base implementation that does not assume specific type inclusion mechanism. Sub-classes are expected to override this method if they are to handle type information.

Annotations
@Override
resolveback to summary
public void resolve(DeserializationContext ctxt)

Overrides tools.jackson.databind.ValueDeserializer.resolve.

Doc from tools.jackson.databind.ValueDeserializer.resolve.

Method called after deserializer instance has been constructed (and registered as necessary by provider objects), but before it has returned it to the caller. Called object can then resolve its dependencies to other types, including self-references (direct or indirect).

Annotations
@Override