Package com.github.fge.jsonpatch.mergepatch

Class JsonMergePatch

java.lang.Object

com.github.fge.jsonpatch.mergepatch.JsonMergePatch

All Implemented Interfaces:

com.fasterxml.jackson.databind.JsonSerializable

Direct Known Subclasses:

NonObjectMergePatch, ObjectMergePatch

@ParametersAreNonnullByDefault
public abstract class JsonMergePatch
extends Object
implements com.fasterxml.jackson.databind.JsonSerializable

Implementation of JSON Merge Patch (RFC 7386)

JSON Merge Patch is a "toned down" version of JSON Patch. However, it covers a very large number of use cases for JSON value modifications; its focus is mostly on patching JSON Objects, which are by far the most common type of JSON texts exchanged on the Internet.

Applying a JSON Merge Patch is defined by a single, pseudo code function as follows (quoted from the RFC; indentation fixed):

     define MergePatch(Target, Patch):
         if Patch is an Object:
             if Target is not an Object:
                 Target = {} # Ignore the contents and set it to an empty Object
             for each Name/Value pair in Patch:
                 if Value is null:
                     if Name exists in Target:
                         remove the Name/Value pair from Target
                 else:
                     Target[Name] = MergePatch(Target[Name], Value)
             return Target
         else:
             return Patch
 

Nested Class Summary

Nested classes/interfaces inherited from interface com.fasterxml.jackson.databind.JsonSerializable

com.fasterxml.jackson.databind.JsonSerializable.Base

Field Summary

Fields

Modifier and Type	Field	Description
protected static com.github.fge.msgsimple.bundle.MessageBundle	BUNDLE
protected static com.fasterxml.jackson.databind.ObjectMapper	MAPPER

Constructor Summary

Constructors

Constructor	Description
JsonMergePatch()

Method Summary

Modifier and Type	Method	Description
abstract com.fasterxml.jackson.databind.JsonNode	apply(com.fasterxml.jackson.databind.JsonNode input)	Apply the patch to a given JSON value
static JsonMergePatch	fromJson(com.fasterxml.jackson.databind.JsonNode node)	Build an instance from a JSON input

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.fasterxml.jackson.databind.JsonSerializable

serialize, serializeWithType

Field Detail

MAPPER

protected static final com.fasterxml.jackson.databind.ObjectMapper MAPPER

BUNDLE

protected static final com.github.fge.msgsimple.bundle.MessageBundle BUNDLE

Constructor Detail

JsonMergePatch

public JsonMergePatch()

Method Detail

fromJson

public static JsonMergePatch fromJson(com.fasterxml.jackson.databind.JsonNode node)
                               throws JsonPatchException

Build an instance from a JSON input

Parameters:

node - the input

Returns:

a JSON Merge Patch instance

Throws:

JsonPatchException - failed to deserialize

NullPointerException - node is null

apply

public abstract com.fasterxml.jackson.databind.JsonNode apply(com.fasterxml.jackson.databind.JsonNode input)
                                                       throws JsonPatchException

Apply the patch to a given JSON value

Parameters:

input - the value to patch

Returns:

the patched value

Throws:

JsonPatchException - never thrown; only for consistency with JsonPatch

NullPointerException - value is null