org.springframework.data.rest.webmvc.json

Class DomainObjectReader

java.lang.Object

org.springframework.data.rest.webmvc.json.DomainObjectReader

public class DomainObjectReader
extends Object

Component to apply an ObjectNode to an existing domain object. This is effectively a best-effort workaround for Jacksons inability to apply a (partial) JSON document to an existing object in a deeply nestes way. We manually detect nested objects, lookup the original value and apply the merge recursively.

Since:

2.2

Author:

Oliver Gierke

Constructor Summary

Constructors

Constructor and Description
DomainObjectReader(PersistentEntities entities, ResourceMappings mappings) Creates a new DomainObjectReader using the given PersistentEntities and ResourceMappings.

Method Summary

Modifier and Type	Method and Description
<T> T	merge(com.fasterxml.jackson.databind.node.ObjectNode root, T existingObject, com.fasterxml.jackson.databind.ObjectMapper mapper) Merges the given ObjectNode onto the given object.
<T> T	read(InputStream source, T target, com.fasterxml.jackson.databind.ObjectMapper mapper) Reads the given input stream into an ObjectNode and applies that to the given existing instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

DomainObjectReader

public DomainObjectReader(PersistentEntities entities,
                          ResourceMappings mappings)

Creates a new DomainObjectReader using the given PersistentEntities and ResourceMappings.

Parameters:

entities - must not be null.

mappings - must not be null.

Method Detail

read

public <T> T read(InputStream source,
                  T target,
                  com.fasterxml.jackson.databind.ObjectMapper mapper)

Reads the given input stream into an ObjectNode and applies that to the given existing instance.

Parameters:

request - must not be null.

target - must not be null.

mapper - must not be null.

Returns:

merge

public <T> T merge(com.fasterxml.jackson.databind.node.ObjectNode root,
                   T existingObject,
                   com.fasterxml.jackson.databind.ObjectMapper mapper)
            throws Exception

Merges the given ObjectNode onto the given object.

Parameters:

root - must not be null.

existingObject -

mapper -

Returns:

Throws:

Exception