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AudiobookDelivery will probably be the child type of OnlineDelivery which is good information, as now it doesn’t even need to deal with the getDeliveryLocations() method. We may change a few faculties of this getDeliveryLocations() method, but that could violate the Liskov Substitution Principle. In lay man ‘s terms, it claims an object of a superclass needs to be replaceable by objects of its subclasses without inducing problems from the application form. A fiscal treaty was presented with Germany to use to force Member States to balance their budgets and spend more . In addition, we proceed the getDeliveryLocations() method to OfflineDelivery and create a new brand new getSoftwareOptions() way for your own OnlineDelivery class (as it is more appropriate for internet deliveries). However, when you would like to reevaluate the getDeliveryLocations() method, we realize that audiobooks can’t be brought to real locations.
Butwe can also choose to refactor our code with the addition of an extra layer of abstraction that represents all types of discounts. This means that at the near future, we can extend our program with other discount types (for instance, using CrimebookDiscount). So, a child type shouldn’t ever alter the traits of its parent class (including the discussion list and return type s ). Instead, site it might reevaluate the getSoftwareOptions() approach to its parent with its own execution (for instance, by list and embedding available audio players). After the processBookDiscount() procedure is called, we could pass both CookbookDiscount and BiographyDiscount as an argument, as these will be the implementation of their BookDiscount interface. So, let’s create a brand new interface named BookDiscount that the CookbookDiscount and also BiographyDiscount classes will implement. From the refactored code, HardcoverDelivery will be the child class of OfflineDelivery plus it’ll populate the getDeliveryLocations() method with its functionality.
This code works fine before store direction notifies us that their cook book discount sales were so powerful they want to expand it. Although the above code works nicely, it may add fresh vulnerabilities to the application form. If you’ve got a brand new feature by expanding your code instead of altering it, you minimize the probability of failure as far as feasible. Now, they want to give away every biography having a 50% discount about them ‘s birthday. The store wants to give away cookbooks at a discount price before xmas. Now, the publication store asks us to add a new delivery functionality to the application. Let’s introduce an extra layer that better differentiates book delivery types. On the UML graph below, you may see by applying the Liskov Substitution Principle, we included an excess layer to this inheritance hierarchy.
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