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Towards a Collection of Refactoring Patterns Based on Code Clone Categorization

Towards a Collection of Refactoring Patterns Based on Code Clone Categorization. Masayuki Tokunaga † , Norihiro Yoshida † † , Kazuki Yoshioka † , Makoto Matsushita † , Katsuro Inoue † † : Osaka university ††: Nara Institute of Science and Technology. Research Background (1/2).

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Towards a Collection of Refactoring Patterns Based on Code Clone Categorization

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  1. Towards a Collection of Refactoring Patterns Based on Code Clone Categorization Masayuki Tokunaga†, Norihiro Yoshida † †, Kazuki Yoshioka †, Makoto Matsushita †, Katsuro Inoue † †: Osaka university ††: Nara Institute of Science and Technology

  2. Research Background (1/2) code clone copy-and-paste • What is Code Clone ? • Code fragments in a source code that are identical or similar to each other • Created by copy-and-paste • Makes software maintenance more difficult • Merged into one module though refactoring

  3. Research Background (2/2) • [1]Martin Fowler, “Refactoring Improving the design of existing code” • What is refactoring pattern? • Pattern of the refactoring process • Decrease the efforts of refactoring • Can be applied to the experimental modification • Typical refactoring pattern • Fowler’s Pattern[1] • Categorize code clone characteristics into five categories • Propose processes of refactoring for each code clone category

  4. Probrem(1/2) • Pattern • Extract method • Categories of code clone characteristics • clone in the same classes • Pattern • Extract method • Categories of code clone characteristics • clone in the same classes（+ having differences） uncategorized characteristics Clone Pair Clone Pair void printOwing(double amount){ printButton(); System.out.print(_name); System.out.print(amount); } void printOwing(double amount){ printButton(); System.out.print(_name); System.out.print(amoujnt); } void printAssets(double amount){ printBanner(); System.out.print(_name); System.out.print(amount); } void printAssets(double amount){ printBanner(); System.out.print(_name); System.out.print(amount+100); } difference according to detailed processes related in clone characteristics according to process in the proposed pattern void printOwing(double amount){ printButton(); printDetail(amount); } void printAssets(double amount){ printBanner(); printDetail(amount); } Easy for beginner void printDetail(double amount){ System.out.print(name); System.out.print(amount); } void printDetail(double amount){ System.out.print(name); System.out.print(amount); } Can’t apply Need an additional work by developer’s decision

  5. Problem(2/2) Detailed categorization of clone characteristics → Help beginner by decreasing uncertain processes • There are uncategorized clones in detail on existing patterns • It is difficult to apply the refactoring pattern for beginners by necessity of developer’s additional work

  6. Our Research Define categorization Auto-add categorization information Create of patterns Detected Clones • Creating refactoring patterns based on the detailed categorization of clone characteristics

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