{"id":75733,"date":"2018-04-10T13:00:58","date_gmt":"2018-04-10T10:00:58","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=75733"},"modified":"2018-04-10T12:25:47","modified_gmt":"2018-04-10T09:25:47","slug":"get-to-know-json-pointer-json-p-1-1-overview-series","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2018\/04\/get-to-know-json-pointer-json-p-1-1-overview-series.html","title":{"rendered":"Get to Know JSON Pointer: JSON-P 1.1 Overview Series"},"content":{"rendered":"<p>Java EE 8 includes an update to the JSON Processing API and brings it up to date with the latest IEFT standards for JSON. They are:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.javacodegeeks.com\/2018\/04\/get-to-know-json-pointer-json-p-1-1-overview-series.html\">JSON Pointer<\/a> (RFC 6901)<\/li>\n<li>JSON Patch (RFC 6902)<\/li>\n<li>JSON Merge Patch (RFC 7396)<\/li>\n<\/ul>\n<p>I will cover these topics in this mini-series.<\/p>\n<h2>Getting Started<\/h2>\n<p>To get started with JSON-P you will need the following dependencies from the Maven central repository.<\/p>\n<pre class=\"brush:xml\">&lt;dependency&gt;\r\n \u00a0\u00a0\u00a0&lt;groupId&gt;javax.json&lt;\/groupId&gt;\r\n \u00a0\u00a0\u00a0&lt;artifactId&gt;javax.json-api&lt;\/artifactId&gt;\r\n \u00a0\u00a0\u00a0&lt;version&gt;1.1&lt;\/version&gt;\r\n&lt;\/dependency&gt;\r\n\r\n&lt;dependency&gt;\r\n \u00a0\u00a0\u00a0&lt;groupId&gt;org.glassfish&lt;\/groupId&gt;\r\n \u00a0\u00a0\u00a0&lt;artifactId&gt;javax.json&lt;\/artifactId&gt;\r\n \u00a0\u00a0\u00a0&lt;version&gt;1.1&lt;\/version&gt;\r\n&lt;\/dependency&gt;<\/pre>\n<h2>JSON-Pointer<\/h2>\n<p>A JSON Pointer defines a string expression that references an element within the hierarchical structure of a JSON document. With a JSON pointer expression, you can access and manipulate a JSON document by retrieving, adding, removing and replacing an element or value referenced by the expression.<\/p>\n<p>The entry API is the <em><strong>javax.json.JsonPointer<\/strong><\/em> interface. An instance is created by calling the static factory method <strong><em>createPointer(String expression)<\/em><\/strong> on the <em><strong>javax.json.Json<\/strong><\/em>\u00a0class and passing it the pointer expression.<\/p>\n<h3>Retrieve a Value<\/h3>\n<p>If given the JSON document below and you want to retrieve the value of the <strong><em>title<\/em> <\/strong>element you create the JSON Pointer expression\u00a0<em><strong>\/title<\/strong><\/em>.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\"brush:bash\">{\r\n\"title\": \"Java EE: Only What's New\",\r\n\"author\": \"Alex Theedom\",\r\n\"chapters\": [\r\n\u00a0 \"Chapter 1: Java EE 8 What\u2019s New Overview\",\r\n\u00a0 \"Chapter 2: Java API for JSON Binding 1.0 (JSR 367)\",\r\n\u00a0 \"Chapter 3: Java EE Security API 1.0 (JSR 375)\"\r\n],\r\n\"released\": true,\r\n\"pages\": 300,\r\n\"sourceCode\": {\r\n\u00a0 \"repositoryName\": \"Java-EE-8-Only-Whats-New\",\r\n\u00a0 \"url\": \"github.com\/readlearncode\/\"\r\n},\r\n\"otherBooks\": [\r\n\u00a0 {\r\n\u00a0 \u00a0 \"title\": \"Professional Java EE Design Patterns\",\r\n\u00a0 \u00a0 \"length\": 350\r\n\u00a0 }\r\n]\r\n}\r\n\r\nJsonObject jsonObject = ... create JSONObject from JSON document ...;<\/pre>\n<p>The code snippet below creates a <strong><em>JsonPointer<\/em> <\/strong>and references the <em><strong>title<\/strong> <\/em>element. It then calls the <strong><em>getValue()<\/em><\/strong> method which is passed the <em><strong>JsonObject<\/strong> <\/em>to query.<\/p>\n<pre class=\" brush:java\">JsonValue jsonValue = Json.createPointer(\"\/title\").getValue(jsonObject);<\/pre>\n<h3>Add a Value<\/h3>\n<p>To add (or insert) a value to a JSON document follow the same logic as retrieval by using a JSON pointer expression to identify the insertion point within the document.\u00a0The following code snippet adds a new <em><strong>\u201ccategory\u201d: \u201cProgramming\u201d<\/strong><\/em> JSON object to the root of the document.<\/p>\n<pre class=\"brush:java\">JsonObject jsonObject = Json\r\n      .createPointer(\"\/category\")\r\n \u00a0 \u00a0 \u00a0.add(jsonObject, Json.createValue(\"Programming\"));<\/pre>\n<p>The <em><strong>JsonObject<\/strong> <\/em>returned is the entire new modified object.<\/p>\n<h3>Remove a Value<\/h3>\n<p>The removal process requires the location of the value to remove expressed as a JSON Pointer expression. The code snippet below removes the <em><strong>title<\/strong> <\/em>element and returns the modified JSON document as a <em><strong>JsonStructure<\/strong> <\/em>instance<\/p>\n<pre class=\"brush:java\">JsonStructure jsonStructure = Json.createPointer(\"\/title\").remove(jsonObject);<\/pre>\n<h3>Replace a Value<\/h3>\n<p>To replace a value the JSON pointer expression of the element to replace and the replacement element is passed to the <em><strong>replace()<\/strong><\/em> method. The code snippet below replaces the <strong><em>title<\/em> <\/strong>element\u2019s value and returns the modified JSON document.<\/p>\n<pre class=\"brush:java\">JsonStructure jsonStructure = Json\r\n\u00a0 \u00a0 \u00a0.createPointer(\"\/title\")\r\n\u00a0 \u00a0 \u00a0.replace(jsonObject, Json.createValue(\"Java EE 8\"));<\/pre>\n<h3>Test a Value<\/h3>\n<p>The exists of a value at a location can be tested with the <em><strong>containsValue()<\/strong> <\/em>method. The code snippet below tests to see it there is a value at the location expressed by the JSON Pointer expression <em><strong>\/doesNotExist<\/strong><\/em>.<\/p>\n<pre class=\"brush:java\">Boolean containsValue = Json\r\n\u00a0 \u00a0 \u00a0.createPointer(\"\/doesNotExist\")\r\n\u00a0 \u00a0 \u00a0.containsValue(jsonObject);<\/pre>\n<h2>Conclusion<\/h2>\n<p>Well, that\u2019s it for the first article\u00a0in this mini-series about JSON Processing\u2019s new features. That\u2019s all for now.<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on Java Code Geeks with permission by Alex Theedom, partner at our <a href=\"\/\/www.javacodegeeks.com\/join-us\/jcg\/\" target=\"_blank\" rel=\"noopener\">JCG program<\/a>. See the original article here: <a href=\"https:\/\/readlearncode.com\/java-ee\/java-ee-8-json-processing-1-1-json-pointer-overview\/\" target=\"_blank\" rel=\"noopener\">Get to Know JSON Pointer: JSON-P 1.1 Overview Series<\/a><\/p>\n<p>Opinions expressed by Java Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Java EE 8 includes an update to the JSON Processing API and brings it up to date with the latest IEFT standards for JSON. They are: JSON Pointer (RFC 6901) JSON Patch (RFC 6902) JSON Merge Patch (RFC 7396) I will cover these topics in this mini-series. Getting Started To get started with JSON-P you &hellip;<\/p>\n","protected":false},"author":500,"featured_media":175,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[69],"class_list":["post-75733","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-json"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Get to Know JSON Pointer: JSON-P 1.1 Overview Series - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Java EE 8 includes an update to the JSON Processing API and brings it up to date with the latest IEFT standards for JSON. 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