Package com.fasterxml.jackson.databind.deser.std

Class JsonNodeDeserializer

java.lang.Object

com.fasterxml.jackson.databind.JsonDeserializer<JsonNode>

com.fasterxml.jackson.databind.deser.std.StdDeserializer<JsonNode>

com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer<JsonNode>

com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer

All Implemented Interfaces:

ContextualDeserializer, NullValueProvider, ValueInstantiator.Gettable, Serializable

public class JsonNodeDeserializer
extends BaseNodeDeserializer<JsonNode>

Deserializer that can build instances of JsonNode from any JSON content, using appropriate JsonNode type.

Rewritten in Jackson 2.13 to avoid recursion and allow handling of very deeply nested structures.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	JsonNodeDeserializer.ArrayDeserializer	Implementation used when declared type is specifically ArrayNode.
(package private) static final class	JsonNodeDeserializer.ObjectDeserializer	Implementation used when declared type is specifically ObjectNode.

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer

BaseNodeDeserializer.ContainerStack

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonDeserializer

JsonDeserializer.None

Field Summary

Fields

Modifier and Type	Field	Description
private static final JsonNodeDeserializer	instance	Singleton instance of generic deserializer for JsonNode.

Fields inherited from class com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer

_mergeArrays, _mergeObjects, _supportsUpdates

Fields inherited from class com.fasterxml.jackson.databind.deser.std.StdDeserializer

_valueClass, _valueType, F_MASK_ACCEPT_ARRAYS, F_MASK_INT_COERCIONS

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JsonNodeDeserializer()
protected	JsonNodeDeserializer(JsonNodeDeserializer base, boolean mergeArrays, boolean mergeObjects)

Method Summary

Modifier and Type	Method	Description
protected JsonDeserializer<?>	_createWithMerge(boolean mergeArrays, boolean mergeObjects)
JsonNode	deserialize(com.fasterxml.jackson.core.JsonParser p, DeserializationContext ctxt)	Implementation that will produce types of any JSON nodes; not just one deserializer is registered to handle (in case of more specialized handler).
Object	getAbsentValue(DeserializationContext ctxt)	Overridden variant to ensure that absent values are NOT coerced into NullNodes, unlike incoming null values.
static JsonDeserializer<? extends JsonNode>	getDeserializer(Class<?> nodeClass)	Factory method for accessing deserializer for specific node type
JsonNode	getNullValue(DeserializationContext ctxt)	Method that can be called to determine value to be used for representing null values (values deserialized when JSON token is JsonToken.VALUE_NULL).
Boolean	supportsUpdate(DeserializationConfig config)	Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not.

Methods inherited from class com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer

_deserializeAnyScalar, _deserializeContainerNoRecursion, _deserializeObjectAtName, _deserializeRareScalar, _fromBigDecimal, _fromEmbedded, _fromFloat, _fromInt, _fromInt, _handleDuplicateField, createContextual, deserializeWithType, isCachable, logicalType, updateObject

Methods inherited from class 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, _verifyStringForScalarCoercion, findContentNullProvider, findContentNullStyle, findConvertingContentDeserializer, findDeserializer, findFormatFeature, findFormatOverrides, findValueNullProvider, getValueClass, getValueInstantiator, getValueType, getValueType, handledType, handleMissingEndArrayForSingle, handleNestedArrayForSingle, handleUnknownProperty, isDefaultDeserializer, isDefaultKeyDeserializer

Methods inherited from class com.fasterxml.jackson.databind.JsonDeserializer

deserialize, deserializeWithType, findBackReference, getDelegatee, getEmptyAccessPattern, getEmptyValue, getEmptyValue, getKnownPropertyNames, getNullAccessPattern, getNullValue, getObjectIdReader, replaceDelegatee, unwrappingDeserializer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

instance

private static final JsonNodeDeserializer instance

Singleton instance of generic deserializer for JsonNode. Only used for types other than JSON Object and Array.

Constructor Details

JsonNodeDeserializer

protected JsonNodeDeserializer()

JsonNodeDeserializer

protected JsonNodeDeserializer(JsonNodeDeserializer base,
 boolean mergeArrays,
 boolean mergeObjects)

Method Details

_createWithMerge

protected JsonDeserializer<?> _createWithMerge(boolean mergeArrays,
 boolean mergeObjects)

Specified by:

_createWithMerge in class BaseNodeDeserializer<JsonNode>

getDeserializer

public static JsonDeserializer<? extends JsonNode> getDeserializer(Class<?> nodeClass)

Factory method for accessing deserializer for specific node type

getNullValue

public JsonNode getNullValue(DeserializationContext ctxt)

Description copied from class: JsonDeserializer

Method that can be called to determine value to be used for representing null values (values deserialized when JSON token is JsonToken.VALUE_NULL). Usually this is simply Java null, but for some types (especially primitives) it may be necessary to use non-null values.

This method may be called once, or multiple times, depending on what JsonDeserializer.getNullAccessPattern() returns.

Default implementation simply returns null.

Specified by:

getNullValue in interface NullValueProvider

Overrides:

getNullValue in class JsonDeserializer<JsonNode>

getAbsentValue

public Object getAbsentValue(DeserializationContext ctxt)

Overridden variant to ensure that absent values are NOT coerced into NullNodes, unlike incoming null values.

Specified by:

getAbsentValue in interface NullValueProvider

Overrides:

getAbsentValue in class JsonDeserializer<JsonNode>

deserialize

public JsonNode deserialize(com.fasterxml.jackson.core.JsonParser p,
 DeserializationContext ctxt)
                     throws IOException

Implementation that will produce types of any JSON nodes; not just one deserializer is registered to handle (in case of more specialized handler). Overridden by typed sub-classes for more thorough checking

Specified by:

deserialize in class JsonDeserializer<JsonNode>

Parameters:

p - Parser used for reading JSON content

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

Returns:

Deserialized value

Throws:

IOException

supportsUpdate

public Boolean supportsUpdate(DeserializationConfig config)

Description copied from class: JsonDeserializer

Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not. Return value should either be 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 deserializer 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.

Overrides:

supportsUpdate in class BaseNodeDeserializer<JsonNode>