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JSON Patch (RFC 6902) and JSON Merge Patch (RFC 7386) implementation in Java

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/*
 * Copyright (c) 2014, Francis Galiegue ([email protected])
 *
 * This software is dual-licensed under:
 *
 * - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
 *   later version;
 * - the Apache Software License (ASL) version 2.0.
 *
 * The text of this file and of both licenses is available at the root of this
 * project or, if you have the jar distribution, in directory META-INF/, under
 * the names LGPL-3.0.txt and ASL-2.0.txt respectively.
 *
 * Direct link to the sources:
 *
 * - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
 * - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
 */

/**
 * JSON Merge Patch implementation
 *
 * 

This is a complete implementation of RFC 7386 (JSON Merge Patch). *

* *

You may want to use this instead of a "pure" (aka RFC 6902) JSON Patch if * you want to do simple patching of JSON Objects, where this implementation * really shines. For instance, if you want to replace a value for one * property {@code p} with JSON String {@code "bar"}, a JSON Patch will read: *

* *
 *     [
 *         { "op": "replace", "path": "/p", "value": "bar" }
 *     ]
 * 
* *

whereas the equivalent JSON Merge Patch will be:

* *
 *     { "p": "bar"}
 * 
* *

Note that this is recursive; therefore, this:

* *
 *     { "a": { "b": "c" } }
 * 
* *

will replace (or add, if not present) the value at JSON Pointer {@code * /a/b} with JSON String {@code "c"}.

* *

HOWEVER: while this seems attractive, there are a few traps. One * of them is that, when a value of an object member in a JSON Merge Patch is * a JSON null, the target will see the equivalent member removed; there * is no way to specify that a value should be set with a JSON null value (JSON * Patch allows for this).

* *

The RFC defines a pseudo code for how a JSON Merge Patch is applied; this * function is replicated in the javadoc for {@link * com.github.fge.jsonpatch.mergepatch.JsonMergePatch}, so you are encouraged to * read the javadoc for this class, and the RFC itself.

*/ package com.github.fge.jsonpatch.mergepatch;




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