Design Patterns by Christopher G. Lasater

By Christopher G. Lasater

Layout styles books were rising in popularity when you consider that languages like Java and C++ first turned known. considering that Microsoft published its first actually object-oriented language, .NET, software program designers from a fair broader diversity of commercial and programming spheres were trying to find how you can refine and write larger code. Many have grew to become towards layout styles, iterative and AGILE layout methodologies, and different extra outlined how one can increase functionality, maintainability, portability, and scalability of code in addition to layout tactics. This publication matches into that desire in that it will possibly educate those who write software program new abilities and strategies for bettering their latest and new coding efforts.

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The product class is the class containing data or functionality and is part of a series of class types that can be rendered from a factory method as an instance of an abstract type. Let’s take a look at some problems that you might encounter when working with your legacy code or creating new code, and how the Factory pattern can help. Creational Patterns 19 Creational Patterns Factory Pattern Factory Pattern RepositoryFactory ConcreteProduct -products +GetProduct(in key) : Product +CreateProduct() : Product 1 product = GetProduct( key ) ....

The base class previously only defined the Attributes parameter, which was the common object parameter accessor for the two classes. Now we want to add a private instance for the desired concrete implementation of the AbstractObjectFactory class: class BaseClass { AbstractObjectFactory _factory; Hashtable _attributes; 46 Chapter 2 Abstract Factory Pattern protected AbstractObjectFactory FactoryImpl { get{return _factory;} set{_factory = value;} } We also change the Attributes parameter, adding a call to the factory implementation if the attributes are not initialized.

Below we see the class has a private collection of type ArrayList. This is to be used to hold the loaded class instances. It is marked private to control access in its inherited members. A little later we will create a protected method to allow loading of class instances to the collection. public abstract class SuitFactory { private ArrayList _loaded = new ArrayList(); In our constructor we call the LoadSuits() method. This ensures our classes that override the LoadSuits() method will have the desired implementations loaded.

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