Abstract
Object-oriented programs evolve by means other than just the addition of new classes. The changes to object-oriented programs that have been most studied are those based on inheritance, on reorganizing a class hierarchy. However, aggregation is a relationship between classes that is just as important as inheritance, and many changes to an object-oriented design involve the aggregate/component relationship. This paper describes some common refactorings based on aggregation, including how to convert from inheritance to an aggregation, and how to reorganize an aggregate/component hierarchy just as one might reorganize a class inheritance hierarchy.
Cite
CITATION STYLE
Johnson, R. E., & Opdyke, W. F. (1993). Refactoring and aggregation. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 742 LNCS, pp. 264–278). Springer Verlag. https://doi.org/10.1007/3-540-57342-9_78
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