Google Summer of Code 2015/JDT UI Code Completion and Refactoring

Contact

gabor at_sign kovesdan dot_here org

Project Goals

• Exploring current refactoring features of JDT UI, especially those related to Java 8 and extend its functionality with new features. For example: refactoring to Optional<T>, using String.join instead of StringBuffer, new Date API etc.

• Implement a simplified substring code completion. Only a small subset of substring matching will be implemented, which are useful to be an integral part of JDT UI. For example, .SelectionListener should match .addSelectionListener but not .addSelectionTestListener or .SL should match .addSelectionListener and .setSelectionListener but not .addSelectionTestListener.

• Implement postfix code completion. It increases developer productivity by reducing the need to jump back in the code. Often we start to type variable or type names and then we realize we have to go back to put a specific keyword before, such as if or throw. A demo about the concept is available [1] Also, there is some work done towards this feature. I propose reviewing and integrating this to JDT.

General TODO

Create wiki for GSOC

Introduction mail to JDT UI list

Clone JDT UI at Github

Sign CLA

Configure my workspace for the work, including Gerrit setup

Code

The code will be available on GitHub: https://github.com/gaborbsd/JDT_UI_SOC2015

Details on Substring completion

Substring code completion will offer any possible suggestions that the pattern matches in a case insensitive way. However, matches that match exactly or match the camel case initials, will be listed with a higher relevance.

Java code completion is implemented in org.eclipse.jdt.internal.codeassist.CompletionEngine. This class relies on the matching functions implemented in org.eclipse.jdt.core.compiler.CharOperation. The main matching logic should be thus implemented in the latter class.

Related Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=350000

Details on Tail Completion completion

We have already a partial contribution for this to JDT, see https://github.com/trylimits/Eclipse-Postfix-Code-Completion https://git.eclipse.org/r/#/c/40855/

Details on Refactoring

Resources on Raffi's page: https://openlab.citytech.cuny.edu/khatchad/research/background/