com.fasterxml.jackson.databind.deser.std

Class JsonNodeDeserializer

java.lang.Object

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

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

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

All Implemented Interfaces:

NullValueProvider, Serializable

public class JsonNodeDeserializer
extends StdDeserializer<T>

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

See Also:

Serialized Form

Nested Class Summary

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

JsonDeserializer.None

Field Summary

Fields

Modifier and Type	Field and Description
protected Boolean	_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 and Description
protected	JsonNodeDeserializer()

Method Summary

Modifier and Type	Method and Description
protected JsonNode	_fromEmbedded(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory)
protected JsonNode	_fromFloat(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory)
protected JsonNode	_fromInt(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory)
protected void	_handleDuplicateField(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory, String fieldName, ObjectNode objectNode, JsonNode oldValue, JsonNode newValue) Method called when there is a duplicate value for a field.
JsonNode	deserialize(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).
protected JsonNode	deserializeAny(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory)
protected ArrayNode	deserializeArray(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory)
protected ObjectNode	deserializeObject(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory) Method called to deserialize Object node instance when there is no existing node to modify.
protected ObjectNode	deserializeObjectAtName(JsonParser p, DeserializationContext ctxt, JsonNodeFactory nodeFactory) Alternate deserialization method used when parser already points to first FIELD_NAME and not START_OBJECT.
Object	deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) Base implementation that does not assume specific type inclusion mechanism.
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	isCachable() Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).
Boolean	supportsUpdate(DeserializationConfig config) Introspection method that may be called to see whether deserializer supports update of an existing value (aka "merging") or not.
protected JsonNode	updateArray(JsonParser p, DeserializationContext ctxt, ArrayNode node) Alternate deserialization method that is to update existing ObjectNode if possible.
protected JsonNode	updateObject(JsonParser p, DeserializationContext ctxt, ObjectNode node) Alternate deserialization method that is to update existing ObjectNode if possible.

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

_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, parseDouble

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 Detail

_supportsUpdates

protected final Boolean _supportsUpdates

Constructor Detail

JsonNodeDeserializer

protected JsonNodeDeserializer()

Method Detail

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>

deserialize

public JsonNode deserialize(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 - Parsed used for reading JSON content

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

Returns:

Deserialized value

Throws:

IOException

deserializeWithType

public Object deserializeWithType(JsonParser p,
                                  DeserializationContext ctxt,
                                  TypeDeserializer typeDeserializer)
                           throws IOException

Description copied from class: StdDeserializer

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.

Overrides:

deserializeWithType in class StdDeserializer<T extends JsonNode>

typeDeserializer - Deserializer to use for handling type information

Throws:

IOException

isCachable

public boolean isCachable()

Description copied from class: JsonDeserializer

Method called to see if deserializer instance is cachable and usable for other properties of same type (type for which instance was created).

Note that cached instances are still resolved on per-property basis, if instance implements ResolvableDeserializer: cached instance is just as the base. This means that in most cases it is safe to cache instances; however, it only makes sense to cache instances if instantiation is expensive, or if instances are heavy-weight.

Default implementation returns false, to indicate that no caching is done.

Overrides:

isCachable in class JsonDeserializer<T extends JsonNode>

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 deserialization 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 JsonDeserializer<T extends JsonNode>

_handleDuplicateField

protected void _handleDuplicateField(JsonParser p,
                                     DeserializationContext ctxt,
                                     JsonNodeFactory nodeFactory,
                                     String fieldName,
                                     ObjectNode objectNode,
                                     JsonNode oldValue,
                                     JsonNode newValue)
                              throws JsonProcessingException

Method called when there is a duplicate value for a field. By default we don't care, and the last value is used. Can be overridden to provide alternate handling, such as throwing an exception, or choosing different strategy for combining values or choosing which one to keep.

Parameters:

fieldName - Name of the field for which duplicate value was found

objectNode - Object node that contains values

oldValue - Value that existed for the object node before newValue was added

newValue - Newly added value just added to the object node

Throws:

JsonProcessingException

deserializeObject

protected final ObjectNode deserializeObject(JsonParser p,
                                             DeserializationContext ctxt,
                                             JsonNodeFactory nodeFactory)
                                      throws IOException

Method called to deserialize Object node instance when there is no existing node to modify.

Throws:

IOException

deserializeObjectAtName

protected final ObjectNode deserializeObjectAtName(JsonParser p,
                                                   DeserializationContext ctxt,
                                                   JsonNodeFactory nodeFactory)
                                            throws IOException

Alternate deserialization method used when parser already points to first FIELD_NAME and not START_OBJECT.

Throws:

IOException

Since:

2.9

updateObject

protected final JsonNode updateObject(JsonParser p,
                                      DeserializationContext ctxt,
                                      ObjectNode node)
                               throws IOException

Alternate deserialization method that is to update existing ObjectNode if possible.

Throws:

IOException

Since:

2.9

deserializeArray

protected final ArrayNode deserializeArray(JsonParser p,
                                           DeserializationContext ctxt,
                                           JsonNodeFactory nodeFactory)
                                    throws IOException

Throws:

IOException

updateArray

protected final JsonNode updateArray(JsonParser p,
                                     DeserializationContext ctxt,
                                     ArrayNode node)
                              throws IOException

Alternate deserialization method that is to update existing ObjectNode if possible.

Throws:

IOException

Since:

2.9

deserializeAny

protected final JsonNode deserializeAny(JsonParser p,
                                        DeserializationContext ctxt,
                                        JsonNodeFactory nodeFactory)
                                 throws IOException

Throws:

IOException

_fromInt

protected final JsonNode _fromInt(JsonParser p,
                                  DeserializationContext ctxt,
                                  JsonNodeFactory nodeFactory)
                           throws IOException

Throws:

IOException

_fromFloat

protected final JsonNode _fromFloat(JsonParser p,
                                    DeserializationContext ctxt,
                                    JsonNodeFactory nodeFactory)
                             throws IOException

Throws:

IOException

_fromEmbedded

protected final JsonNode _fromEmbedded(JsonParser p,
                                       DeserializationContext ctxt,
                                       JsonNodeFactory nodeFactory)
                                throws IOException

Throws:

IOException