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The main content of this article is to explain "what is the role of BUILDER". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the role of BUILDER?"

Participant

Builder (TextConverter)

-specifies an abstract interface for each part that creates a Product object.

ConcreteBuilder (ASCIIConverter,TeXConverter,TextWidgetConverter)

-implement the interface of Builder to construct and assemble the various parts of the product.

-defines and defines the representation it creates.

-provides an interface to retrieve products (for example, GetASCIIText and GetTextWidget).

Director (RTFReader)

-construct an object that uses the Builder interface.

Product (ASCIIText, TeXText, TextWidget)

-represents the complex object being constructed. ConcreteBuilder creates an internal representation of the product and defines its assembly process.

-contains classes that define the components, including interfaces that assemble them into the final product.

It's another question of understanding memory.

The first is the abstract Builder class and the concrete ConcreteBuilder class, one is to define the interface, the other is to implement the interface. About 20 of the 23 design patterns are like this.

The class that uses Builder is Director rather than Client, because the responsibilities of Builder are relatively basic, and Director is in charge of what to do.

As for Product, just remember that it is more complex.

Collaboration

The customer creates a Director object and configures it with the Builder object it wants.

Once the product part is generated, the director notifies the generator.

The generator processes the director's request and adds the part to the product.

The customer retrieves the product from the generator.

The customer creates the Director object and configures the Director object with the Builder object it needs.

Director notifies Builder when the product part needs to be generated.

Builder processes the Director request and adds the part to the product.

The customer receives the product from Builder.

GetResult is just a semantic acquisition, and Client can also specify a file name in advance, or a piece of memory to hold the object to be built.

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