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--- principles:encapsulate_the_concept_that_varies [2013-01-30 10:44] – OCP, SRP christian
+++ principles:encapsulate_the_concept_that_varies [2021-09-02 19:36] – old revision restored (2021-05-11 21:52) 65.21.179.175
@@ Line 39: / Line 39: @@
   * [[Generalization Principle]]
+  * [[Open-Closed Principle]]
 ==== Specializations ====
-  * [[Single Responsibility Principle]] (SRP): A responsibility in the sense of SRP is defined as "a reason for change". This is a concept that varies over time. SRP tells that each module should have exactly one responsibility, i.e. the concept/responsibility should be encapsulated in that module.
+  * [[Single Responsibility Principle]] (SRP):
-  * [[Open-Closed Principle]] (OCP): The OCP demands encapsulating abstract concepts in base classes (or interfaces) in order to be able to enhance the module by subclassing which is possible without changing the previously written code. In this case several variations of a concept may exist in the code at the same time. There is always the abstract base class plus one or usually more concrete subclasses. So the OCP is about encapsulating abstract concepts that vary "in space".
 ==== Contrary Principles ====
   * [[More Is More Complex]] (MIMC): ECV demands adding a new class for a new varying concept.
-  * [[Keep It Simple Stupid]] (KISS): ECV demands adding a new class for a new varying concept. This adds complexity.
   * [[Model Principle]] (MP): ECV sometimes results in classes which do not correspond top a real-world concept in the sense of MP. A "concept that varies" can also be a technical concept.