Class JsonObjectDeserializer<T>

java.lang.Object

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

org.springframework.boot.jackson.JsonObjectDeserializer<T>

Type Parameters:

T - the supported object type

All Implemented Interfaces:

com.fasterxml.jackson.databind.deser.NullValueProvider

public abstract class JsonObjectDeserializer<T>
extends com.fasterxml.jackson.databind.JsonDeserializer<T>

Helper base class for JsonDeserializer implementations that deserialize objects.

Since:

4.0.0

Author:

Phillip Webb

See Also:

• JsonObjectSerializer

Nested Class Summary

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

com.fasterxml.jackson.databind.JsonDeserializer.None

Constructor Summary

Constructors

Constructor	Description
JsonObjectDeserializer()

Method Summary

Modifier and Type	Method	Description
final T	deserialize(com.fasterxml.jackson.core.JsonParser jp, com.fasterxml.jackson.databind.DeserializationContext ctxt)
protected abstract T	deserializeObject(com.fasterxml.jackson.core.JsonParser jsonParser, com.fasterxml.jackson.databind.DeserializationContext context, com.fasterxml.jackson.core.ObjectCodec codec, com.fasterxml.jackson.databind.JsonNode tree)	Deserialize JSON content into the value type this serializer handles.
protected final com.fasterxml.jackson.databind.JsonNode	getRequiredNode(com.fasterxml.jackson.databind.JsonNode tree, String fieldName)	Helper method to return a JsonNode from the tree.
protected final <D> D	nullSafeValue(com.fasterxml.jackson.databind.JsonNode jsonNode, Class<D> type)	Helper method to extract a value from the given jsonNode or return null when the node itself is null.
protected final <D, R> R	nullSafeValue(com.fasterxml.jackson.databind.JsonNode jsonNode, Class<D> type, Function<D,R> mapper)	Helper method to extract a value from the given jsonNode or return null when the node itself is null.

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

deserialize, deserializeWithType, deserializeWithType, findBackReference, getAbsentValue, getDelegatee, getEmptyAccessPattern, getEmptyValue, getEmptyValue, getKnownPropertyNames, getNullAccessPattern, getNullValue, getNullValue, getObjectIdReader, handledType, isCachable, logicalType, replaceDelegatee, supportsUpdate, unwrappingDeserializer

Methods inherited from class java.lang.Object

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

Constructor Details

JsonObjectDeserializer

public JsonObjectDeserializer()

Method Details

deserialize

public final T deserialize(com.fasterxml.jackson.core.JsonParser jp,
 com.fasterxml.jackson.databind.DeserializationContext ctxt)
                    throws IOException

Specified by:

deserialize in class com.fasterxml.jackson.databind.JsonDeserializer<T>

Throws:

IOException

deserializeObject

protected abstract T deserializeObject(com.fasterxml.jackson.core.JsonParser jsonParser,
 com.fasterxml.jackson.databind.DeserializationContext context,
 com.fasterxml.jackson.core.ObjectCodec codec,
 com.fasterxml.jackson.databind.JsonNode tree)
                                throws IOException

Deserialize JSON content into the value type this serializer handles.

Parameters:

jsonParser - the source parser used for reading JSON content

context - context that can be used to access information about this deserialization activity

codec - the ObjectCodec associated with the parser

tree - deserialized JSON content as tree expressed using set of TreeNode instances

Returns:

the deserialized object

Throws:

IOException - on error

See Also:

• deserialize(JsonParser, DeserializationContext)

nullSafeValue

protected final <D,
R> R nullSafeValue(com.fasterxml.jackson.databind.JsonNode jsonNode,
 Class<D> type,
 Function<D,R> mapper)

Helper method to extract a value from the given jsonNode or return null when the node itself is null.

Type Parameters:

D - the data type requested

R - the result type

Parameters:

jsonNode - the source node (may be null)

type - the data type. May be String, Boolean, Long, Integer, Short, Double, Float, BigDecimal or BigInteger.

mapper - a mapper to convert the value when it is not null

Returns:

the node value or null

Since:

3.4.0

nullSafeValue

protected final <D> D nullSafeValue(com.fasterxml.jackson.databind.JsonNode jsonNode,
 Class<D> type)

Helper method to extract a value from the given jsonNode or return null when the node itself is null.

Type Parameters:

D - the data type requested

Parameters:

jsonNode - the source node (may be null)

type - the data type. May be String, Boolean, Long, Integer, Short, Double, Float, BigDecimal or BigInteger.

Returns:

the node value or null

getRequiredNode

protected final com.fasterxml.jackson.databind.JsonNode getRequiredNode(com.fasterxml.jackson.databind.JsonNode tree,
 String fieldName)

Helper method to return a JsonNode from the tree.

Parameters:

tree - the source tree

fieldName - the field name to extract

Returns:

the JsonNode