Yogesh's Tech Blog

Coming from Java background, it is happened to be searched java language constructs while coding javascript. One of such construct is overloaded methods/function. Take a look following code snippet   //Normal sum var intergerSum = sum ( 10 , 20 ); //Expecting item price sum var objectSum = sum ( {item_id: '01' ,name: 'abc' , price: 100 }, {item_id: '02' ,name: 'xyz' , price: 200 } ); As per above code snippet, implementation of ‘sum’ has been abstracted from the user. In the world of type safe language like Java, it is very straight forward, but in case of javascript we need to have our custom implementation. Lets see how can we achieve above in javascript. Lets start with defining a constructor function which introduce a common function to all our custom object so that we can extract integer value for summation. //constructor function to introduce new function to custom object function item (options) { var instance = Object...

Do you know Javascript … Try these puzzle Javascript is one the most miss-understood language among developers. Everyday I learn new lesson about it.While going through few articles I thought of following JS language puzzles. Handling Array var days = [ 'Monday' , 'Tuesday' , 'Wednesday' , 'Thursday' , 'Friday' , 'Saturday' ]; var length = days. length ; console. log ( 'No of days are ' + days. length ); //Opps we missed Sunday, lets add it days[++ length ] = 'Sunday' ; console. log ( 'Final no of days are ' + days. length ); It is obvious that no of days are 7…. is it ? Written with StackEdit . StackEdit is a full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites. ↩ Here is the text of the footnote . ↩

JSON is the choice data transfer format used all RESTful services because it is light weight, open standard, less verbose and easy to understand. One of the most important factor for all current generation services is performance and JSON format satisfies all such needs. There are already few third party Java APIs available to JSON parsing but with growing popularity, JEE introduced new JSON processing 1.0 API as part of JSR-353. This API supports both object model as well as streaming model for processing JSON, which are similar to those used for XML documents.This API is limited to JSON processing but not binding, JSON-binding framework will be available in subsequent version of JEE. Object vs Streaming Model : The object model creates a tree that represents the JSON data in memory. The tree can then be navigated, analyzed, or modified. This approach is the most flexible and allows for processing that requires access to the complete contents of the tree. However, it is often sl...

Recently out product has adapted JDK 7 for development as well as run-time. So get familiar everybody in the team with the new features of JDK , so i prepared a presentation "Getting started with Java 7". Sharing same presentation to refer you haven't still adapted JDK7.  Presentation:

Blocking drag & drop action to non-editable section It is an additional post to Eclipse Editor: Partially editable/read-only editor series . In all the previous pos ts I have explained making editor partially editable step by step to make functionality more robust. This post I am going to explain how to block drag & drop action to non-editable section of editor. Eclipse’s default implementation of text editor supports drag and drop of selection of text. When you have read-only as well as editable code section present, then such drag and drop may disturb read-only code section. To prevent the read-only code section from getting modified knowing or unknowingly , any drop action on read-on code section should be disabled. Eclipse TextEditor gives handle to DragAndDrop service , using it you can install your own implementation for DropTragetListener against the expected source viewer control. In your implementation any drop operation on the read-only code section can be ignore...

While working on RCP application in eclipse, you need to capture and display the key or combination of key pressed by user. For example to capture key combination for a binding. If it is character key (printable) then its easy to get character presentation from pressed key code. But it would be little difficult to represent sequence of key or non printable key like “Insert”, “Backspace” etc. The straight forward way is to have map between key integer code and its string presentation, liked explained in SWT snippet Print Key State, Code and Character . There is optimized and standard way is available using eclipse JFace framework. It provides a utility class , SWTKeySupport , for converting SWT events into key strokes and KeySequence , to represent zero or multiple key strokes. KeySequence provides standard string presentation of sequence of keys captured. Here is the simple SWT program to demonstrate usage of these utility classes import org.eclipse.jface.bindings.keys.KeySequenc...

Blocking Editor Actions in read-only code section: In addition to previous posts about partially editable/read-only editor, I am going to explain blocking editor actions like Ctrl-D in read-only code sections. Till now I have taken care of keyboard events and background color for read only code section. This post, we will see restricting editor actions like Ctrl-D, move line up/down etc. I am going to extend same example of XML editor . In this example, XMLEditor extends TextEditors and hence AbstractTextEditor. AbstractTextEditor is the one who introduces all basic text editor actions to text editor. Few of these actions are Delete Line Cut line move line up/down copy line up/down Shift Left/Right Every Action implements IAction directly or indirectly, IAction provides flexibility of enabling/disabling or handling by providing following set of methods 1: /** 2: * Returns whether this action is enabled. 3: * <p> 4: ...