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com.fasterxml.jackson.databind.deser.std

public abstract Class StdNodeBasedDeserializer<T>

extends StdDeserializer<T>
implements ResolvableDeserializer
Class Inheritance
All Implemented Interfaces
com.fasterxml.jackson.databind.deser.ResolvableDeserializer
Type Parameters
<T>
Target type of this deserializer; that is, type of values that input data is deserialized into.
Imports
java.io.IOException, com.fasterxml.jackson.core.*, com.fasterxml.jackson.databind.*, com.fasterxml.jackson.databind.deser.ResolvableDeserializer, com.fasterxml.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 StdDelegatingDeserializer).
Since
2.5

Field Summary

Modifier and TypeField and Description
protected JsonDeserializer<Object>
_treeDeserializer

private static final long
serialVersionUID

Hides com.fasterxml.jackson.databind.deser.std.StdDeserializer.serialVersionUID.

Inherited from com.fasterxml.jackson.databind.deser.std.StdDeserializer:
_valueClass_valueTypeF_MASK_ACCEPT_ARRAYSF_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 implements com.fasterxml.jackson.databind.deser.ContextualDeserializer.

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
Parser used for reading JSON content
jp, DeserializationContext
Context that can be used to access information about this deserialization activity.
ctxt)

Implements abstract com.fasterxml.jackson.databind.JsonDeserializer.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 com.fasterxml.jackson.databind.JsonDeserializer.deserialize.

Added to support convert(JsonNode, DeserializationContext, Object)

public Object
deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer
Deserializer to use for handling type information
td)

Overrides com.fasterxml.jackson.databind.deser.std.StdDeserializer.deserializeWithType.

Base implementation that does not assume specific type inclusion mechanism.

public void
resolve(DeserializationContext
Context to use for accessing configuration, resolving secondary deserializers
ctxt)

Implements com.fasterxml.jackson.databind.deser.ResolvableDeserializer.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 com.fasterxml.jackson.databind.deser.std.StdDeserializer:
_byteOverflow_checkBooleanToStringCoercion_checkCoercionFail_checkDoubleSpecialValue_checkFloatSpecialValue_checkFloatToIntCoercion_checkFloatToStringCoercion_checkFromStringCoercion_checkFromStringCoercion_checkIntToFloatCoercion_checkIntToStringCoercion_checkTextualNull_checkToStringCoercion_coerceBooleanFromInt_coercedTypeDesc_coercedTypeDesc_coerceEmptyString_coerceIntegral_coerceNullToken_coerceTextualNull_deserializeFromArray_deserializeFromEmpty_deserializeFromEmptyString_deserializeFromString_deserializeWrappedValue_failDoubleToIntCoercion_findCoercionFromBlankString_findCoercionFromEmptyArray_findCoercionFromEmptyString_findNullProvider_hasTextualNull_intOverflow_isBlank_isEmptyOrTextualNull_isFalse_isIntNumber_isNaN_isNegInf_isPosInf_isTrue_neitherNull_nonNullNumber_parseBoolean_parseBooleanFromInt_parseBooleanPrimitive_parseBooleanPrimitive_parseBytePrimitive_parseDate_parseDate_parseDateFromArray_parseDouble_parseDouble_parseDoublePrimitive_parseDoublePrimitive_parseDoublePrimitive_parseFloatPrimitive_parseFloatPrimitive_parseFloatPrimitive_parseInteger_parseInteger_parseIntPrimitive_parseIntPrimitive_parseLong_parseLong_parseLongPrimitive_parseLongPrimitive_parseShortPrimitive_parseString_parseString_reportFailedNullCoerce_shortOverflow_verifyEndArrayForSingle_verifyNullForPrimitive_verifyNullForPrimitiveCoercion_verifyNullForScalarCoercion_verifyNumberForScalarCoercion_verifyStringForScalarCoercionfindContentNullProviderfindContentNullStylefindConvertingContentDeserializerfindDeserializerfindFormatFeaturefindFormatOverridesfindValueNullProvidergetValueClassgetValueInstantiatorgetValueTypegetValueTypehandledTypehandleMissingEndArrayForSinglehandleNestedArrayForSinglehandleUnknownPropertyisDefaultDeserializerisDefaultKeyDeserializer

Field Detail

_treeDeserializerback to summary
protected JsonDeserializer<Object> _treeDeserializer
serialVersionUIDback to summary
private static final long serialVersionUID

Hides com.fasterxml.jackson.databind.deser.std.StdDeserializer.serialVersionUID.

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 implements com.fasterxml.jackson.databind.deser.ContextualDeserializer.

Method Detail

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

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 jp, DeserializationContext ctxt) throws IOException

Implements abstract com.fasterxml.jackson.databind.JsonDeserializer.deserialize.

Doc from com.fasterxml.jackson.databind.JsonDeserializer.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 JsonDeserializer#getNullValue(DeserializationContext) method is called to produce a null value. To influence null handling, custom deserializers should override JsonDeserializer#getNullValue(DeserializationContext) and usually also JsonDeserializer#getNullAccessPattern().

Parameters
jp:JsonParser

Parser used for reading JSON content

ctxt:DeserializationContext

Context that can be used to access information about this deserialization activity.

Returns:T

Deserialized value

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

Overrides com.fasterxml.jackson.databind.JsonDeserializer.deserialize.

Added to support convert(JsonNode, DeserializationContext, Object)

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

Overrides com.fasterxml.jackson.databind.deser.std.StdDeserializer.deserializeWithType.

Doc from com.fasterxml.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.

Parameters
td:TypeDeserializer

Doc from com.fasterxml.jackson.databind.JsonDeserializer.deserializeWithType.

Deserializer to use for handling type information

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

Implements com.fasterxml.jackson.databind.deser.ResolvableDeserializer.resolve.

Doc from com.fasterxml.jackson.databind.deser.ResolvableDeserializer.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).

Parameters
ctxt:DeserializationContext

Context to use for accessing configuration, resolving secondary deserializers

Annotations
@Override