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public class NewsFeed extends JavaScriptObject { protected NewsFeed() { } public final native String getClickUrl(final int i) /*-{ return thisResultSetResult[i]ClickUrl; }-*/; public final native String getSummary(final int i) /*-{ return thisResultSetResult[i]Summary; }-*/; public final native String getTitle(final int i) /*-{ return thisResultSetResult[i]Title; }-*/; public final native int getTotalResultsReturned() /*-{ return thisResultSettotalResultsReturned; }-*/; }
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All methods must be final or private, so the compiler will resolve the call at compile time and generate optimized, possibly inlined, code (We ll see the results of this optimization next) Through overlays, your Java code can interact with the JavaScript object with no fuss You could even add extra Java-only methods to NewsFeed; for example, we could write something like and feel free to fill in the details the getAge() method, which would tell how old is a piece of news
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public final long getAge(final int i) { // use a JSNI method to get the PublishDate attribute // of the i-th news item, and store it to newsTimeStamp // get the current timestamp by using new Date()getTime() // and store it to currentTimeStamp return currentTimeStamp - newsTimeStamp; }
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Note that this enables having a richer view of the underlying JavaScript object than the original object would have enabled Given the preceding class, the displayNews() method iterates through all news items (their quantity is obtained through the getTotalResultsReturned() method) and constructs a link (by using getClickUrl() and getTitle()) with the following getSummary() results A couple of empty lines separate different news items
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void displayNews(NewsFeed data) { String show = ""; final int news = datagetTotalResultsReturned(); for (int i = 0; i < news; i++) { show += "<a href='" + datagetClickUrl(i) + "' target='_blank'>" + datagetTitle(i) + "</a><br/>" + datagetSummary(i) + "<br/><br/"; } getDisplay()setNews(show); }
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Used in this way, JSON is easier to work with than XML If you compile the project producing Pretty code (as we mentioned in 2, Getting Started with GWT 2 ) you ll see the produced JavaScript code is as compact as it could be, and practically a one-by-one translation of your Java code:
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function $displayNews(this$static, data){ var i, news, show; show = ''; news = dataResultSettotalResultsReturned; for (i = 0; i < news; ++i) { show += "<a href='" + dataResultSetResult[i]ClickUrl + "' target='_blank'>" + dataResultSetResult[i]Title + '<\/a><br/>' + dataResultSetResult[i]Summary + '<br/><br/'; } dynamicCast(this$staticdisplay_0,9)newsResultelementinnerHTML = show || ''; }
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The produced code is exactly what you d directly write in JavaScript (in passing, note that the calls to data methods were inlined, so there s no overhead there; this validates what we said about the need for private, final methods) so it will run faster than if it had received XML
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Because you can load JavaScript code from other domains, and JSON objects are JavaScript code, it stands to reason that you can get JSON objects without regard to SOP restrictions but how do you know when the object is ready JSONP (JSON with Padding) provides a solution When you connect to a JSONP server, you add an argument that becomes a callback to a function, with the JSON data as a parameter For example, the same call to the Yahoo! News search function, with an added callback=yourownfunction parameter, returns something like the following, minus extra spaces added for readability:
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yourownfunction({"ResultSet": { "totalResultsAvailable":"19919", "totalResultsReturned":5, "firstResultPosition":"1", "Result": [{ "Title":"Here are ", "Summary":"Maybe you've resolved ", "Url":"http:\/\/wwwusatodaycom", "ClickUrl":"", "NewsSource":"USA Today", "NewsSourceUrl":"http:\/\/wwwusatodaycom\/", "Language":"en", "PublishDate":"1262970718", "ModificationDate":"1262972040"}, {"Title":"Final Glance: Computer companies",}, {}]}})
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When the script is loaded, it will execute, and thus call yourownfunction(), which will process the received JSON string a nice way to skip around cross origin restrictions! (Of course, a serious warning must be given: If you connect to an untrusted site, receive a JSONP result, and blindly use it, anything may happen You are purposefully avoiding SOP tests, so you must fully trust the downloaded code) Up to GWT 17, you had to code JSONP calls by hand (you had to do some DOM maneuvering to add a <script> node to your current page and then set its URL appropriately) but GWT 2 added the JsonpRequestBuilder class, which enables you to do JSONP calls in a fashion similar to Ajax calls You must, however, add
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