Latent Semantic Indexing(LSI) is a common technique in natural language processing area. This article is about how LSI works by comparing the pure key-word-based search. What is LSI? Latent Semantic Indexing (LSI) is an indexing and retrieval method that uses a mathematical technique called Singular value decomposition (SVD) to identify patterns in the relationships between … Read more
This tutorial belongs to Eclipse JDT Tutorial Series.
Given a method, we may want a count of the number of statements in the method (for ex: to gauge the complexity of the method). We can use eclipse JDT ASTParser to get this job done.
One approximate way to count the number of statements in a method is to count the number of lines ending with the semi-colon along with lines that contain the words “if/for/while/”.
Bug reports are artifacts that track the defects of software systems. In software maintenance research area, there has been a bunch of research work addressing problem of bug reports in recent years.
Bugzilla is one of the most popular bug reporting system. For the sake of its popularity and open-source feature, the data for research are largely provided by Bugzilla.
The diagram below shows the major categories of work in this area. The left-bottom corner is a sample bug report from Bugzilla.
The OSGi(Open Services Gateway initiative) framework provides a dynamic modular architecture which has been used in many applications such as Eclipse Equinox, Apache Felix, etc. Understanding how OSGi framework works is useful for developing Eclipse plugins and many other molecularity applications. In this article, the high-level overview of the architecture is explained. OSGi framework architecture … Read more
Most software/libraries that I want to make are already made by others. Similarly, there is a lot of tools in natural language process area. There are free and maintained and have been used by a number of people. It is worth to take a look and explore some of them. Here I list some tools … Read more
Diagram is (Sometimes) Worth Ten Thousand Words. During my research starting stage, I’m trying to get myself better understanding of state-of-the-art in software engineering area. The diagram below is first one of this series. It contains the basic research topics in software maintenance/evolution area of software engineering. To better understand on each small topic on … Read more
Garbage collection in java can not be enforced. But still sometimes, we call the System.gc( ) method explicitly. System.gc() method provides just a “hint” to the JVM that garbage collection should run. It is not guaranteed!
The Java super class java.lang.Object defines two important methods: public boolean equals(Object obj) public int hashCode()public boolean equals(Object obj) public int hashCode() In this post, I will first show an example of a common mistake, and then explain how the equals() and hashCode() contract works. 1. A common mistake The common mistake is shown in … Read more
Singleton pattern is one of the most commonly used patterns in Java. It is used to control the number of objects created by preventing external instantiation and modification. This concept can be generalized to systems that operate more efficiently when only one object exists, or that restrict the instantiation to a certain number of objects, … Read more
A paper/research normally has a section or two about the significance of the problem and current solutions. To clearly identify previous research is the requirement of a new research. Even though this is obvious when talk about it, sometimes it is not always remembered and lead to nowhere when start a new research topic.
Here are some research about code assistant conducted in software engineering research area. Those topics are pretty common, and a lot of people have developed various kinds of tools. 1. Mining Subclassing Directives to improve Framework Reuse. Idea: reverse engineer from application-specific code, how-to-use documentation of a particular software artifact can be inferred from how … Read more
State Design Pattern is mainly for changing state at run-time. State pattern story People can live with different financial status. They can be rich or they can be poor. The two states – rich and poor – can be converted to each other from time to time. The idea behind the example: people normally work … Read more
The following example is actually from eclipse. It simply adds a Menu to the menu bar and a icon to the tool bar. When the menu item in the new menu or the icon in tool bar is clicked, a message dialog pops up. File->New->Project->Plug-in Project Project name: HelloWordMenu File Structure: MANIFEST.MF specifies the dependency. … Read more
Code reuse is one of the most important factors in software development. It is a VERY good idea to put frequently-used functions together and build a library for yourself. Whenever some method is used, just simply make a method invocation. For Java, it’s straightforward to manage such a library. Here a simple example in Eclipse. The library will contain only one “add” method for demo purpose.
Step 1: Create a “Java Project” named as “MyMath”, and a simple “add” method under “Simple” class.
Package structure is as follows:
The Lightbox effect in NextGen Gallery is actually not working. To enable lightbox effect, there is another plugin which works for NextGen Gallery – slimbox. Just search “slimbox”, and enable this plugin. Then enable lightbox effect for under NextGen Gallery options->effects. Also to use lighbox, it’s a good idea to resize image to 800*600 by … Read more