Mittwoch, 6. August 2008

new oaw refactoring features

hello folks,

here are news from the oaw code frontier. I finished implementing the move extension and rename resource feature. the move extension feature was trickier than I thought .. you not only have to delete the extension from the source file and insert it into the target file, you have to check which namespace and extensions are required to get the moved extension running within the target xtend file and you have to determine where to insert each import. I had a lot of MalformedTreeExceptions meaning that the insertions of new imports overlap or the inserted extension is not inside the document range :@!
the tricky part of the calculation of the import offsets, the positions each import shall be inserted at, is the differentiation of different cases: is the target file empty, does it contain imports only, does it contain imports and extensions .. my code was covered with ugly nested, not understandable if-statements. to come up with this mess, I used the Strategy Pattern. the gof book says that it should be applied, if "different algorithms will be appropriate at different times". my base strategy class handles the common operations for the movement of an extension: remove the extension from the source file, update imports in all other files etc. it contains an abstract method called "createTargetFileChanges", which has to be overridden by subclasses implementing a different insertion strategy. according to the target file's state, an appropriate strategy is chosen. the code is much clearer now and new cases can be handled (added) easier.

A screencast showing the implemented features in action can be found here (.avi, 24.2 mb). the ui looks a little bit inconsistent and unhandy .. this is my next implementation step.

I could not work that much the last days, since I got my admission for the master program at the hasso-plattner-institute for software systems engineering (YESSSS!) and I had to do a lot of administrative stuff .. get rid of my old flat, leave my old university.

I planned to submit a paper about the modeling tool and distributed model simulation environment for information retrieval processes developed during my bachelor thesis to the mdsd today conference, but due to the upcoming gsoc deadline I will not have the time for writing one :(.

So, during the next days I will focus my implementation efforts on the ui aspects of the oaw refactoring feature and finally I will test it using a real life oaw project.

stay tuned!


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