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RealmProvider: Retrieving data from Realm. RealmQueryBuilder: Initializing CoreDataProvider with 2 operations: Output.txt: Execution result Client: Start fetching data from Realm Print("Client: I have fetched: " + String(unt) + " records.") Static func someClientCode(director: Director) )
Swift constructor code#
/ The client code creates a builder object, passes it to the director and then Return "Product parts: " + parts.joined(separator: ", ") + "\n" In other words, results of various builders may not / Unlike in other creational patterns, different concrete builders can produce / complex and require extensive configuration. / It makes sense to use the Builder pattern only when your products are quite / The Director can construct several product variations using the same This way, the client code may alter the final type of the newly / The Director works with any builder instance that the client code passes / optional, since the client can control builders directly. It is helpful when producing products according to a / The Director is only responsible for executing the building steps in a / client code before disposing of the previous result. / and you can make your builders wait for an explicit reset call from the / That's why it's a usual practice to call the reset method at the end of / instance is expected to be ready to start producing another product. / Usually, after returning the end result to the client, a builder / (at least in a statically typed programming language). / Therefore, such methods cannot be declared in the base Builder interface / entirely different products that don't follow the same interface. That's because various types of builders may create / Concrete Builders are supposed to provide their own methods for / All production steps work with the same product instance. / A fresh builder instance should contain a blank product object, which is / several variations of Builders, implemented differently. / specific implementations of the building steps. / The Concrete Builder classes follow the Builder interface and provide / The Builder interface specifies methods for creating the different parts of
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Example.swift: Conceptual example import XCTest In what way the elements of the pattern are related?Īfter learning about the pattern’s structure it’ll be easier for you to grasp the following example, based on a real-world Swift use case.This example illustrates the structure of the Builder design pattern and focuses on the following questions: