Template Method Design Pattern

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Questions and Answers

What is the main goal of the Template Method pattern in the context of the data mining application?

To reduce the number of classes in the application

To eliminate code duplication and provide a uniform interface for client code (correct)

To implement a proxy object that can delay the loading of document parsing algorithms

To create a composite object that can handle multiple document formats

How does the Template Method pattern address the issue of client code with multiple conditionals?

By using a Decorator pattern to add new functionality to the client code

By using polymorphism to call methods on a processing object (correct)

By using a Bridge pattern to separate the implementation from the abstraction

By using a Flyweight pattern to share common data between objects

What is the role of the base class in the Template Method pattern?

To define a composite object that can handle multiple document formats

To implement a Flyweight pattern to share common data between objects

To act as a proxy object that can delay the loading of document parsing algorithms

To define a template method that consists of a series of calls to document-processing steps (correct)

What is the advantage of using a Template Method pattern in the data mining application?

It reduces code duplication and provides a uniform interface for client code Signup and view all the answers

What is the primary focus of the Template Method pattern?

To define a series of steps in an algorithm and provide a template method to execute them Signup and view all the answers

How does the Template Method pattern address the issue of code duplication in the data mining application?

By defining a template method that consists of a series of calls to document-processing steps Signup and view all the answers

What is the role of the client code in the Template Method pattern?

To provide a subclass that implements all abstract steps and overrides some of the optional ones Signup and view all the answers

What is the benefit of using a Template Method pattern in the context of the data mining application?

It provides a uniform interface for client code and reduces code duplication Signup and view all the answers

What is the main purpose of the Template Method pattern in the context of the game AI?

To define the skeleton of an algorithm and allow subclasses to implement specific steps Signup and view all the answers

What type of steps are declared as abstract in the Template Method pattern?

Abstract steps Signup and view all the answers

What is the purpose of hooks in the Template Method pattern?

To provide an optional extension point for the algorithm Signup and view all the answers

Which of the following is an example of the Template Method pattern in real life?

Designing a new architectural plan Signup and view all the answers

What is the benefit of using the Template Method pattern in the game AI?

It enables code reuse and reduces duplication Signup and view all the answers

What is the role of the abstract class in the Template Method pattern?

It defines the skeleton of an algorithm and declares abstract operations Signup and view all the answers

What is the difference between abstract steps and optional steps in the Template Method pattern?

Abstract steps must be implemented, while optional steps have a default implementation Signup and view all the answers

What is the advantage of using the Template Method pattern in the context of the game AI?

It enables code reuse and flexibility Signup and view all the answers

What is the relationship between the base class and the subclasses in the Template Method pattern?

The base class defines the skeleton of an algorithm, and the subclasses implement specific steps Signup and view all the answers

What is the main difference between the Template Method pattern and other design patterns, such as Bridge or Composite?

The Template Method pattern focuses on algorithms, while Bridge and Composite focus on object structure Signup and view all the answers

Study Notes

Template Method Pattern

The Template Method pattern breaks down an algorithm into a series of steps, turning them into methods, and puts a series of calls to these methods inside a single template method.
The steps may either be abstract, or have some default implementation.
To use the algorithm, the client is supposed to provide its own subclass, implement all abstract steps, and override some of the optional ones if needed.

Problem and Solution

The problem is code duplication in data mining classes for different file formats (DOC, CSV, PDF).
The solution is to create a base class for all three parsing algorithms, defining a template method consisting of a series of calls to various document-processing steps.
Subclasses can override these steps but not the actual template method.

Steps in Template Method

Abstract steps: must be implemented by every subclass.
Optional steps: already have some default implementation, but can be overridden if needed.
Hooks: optional steps with an empty body, can be placed before and after crucial steps of algorithms.

Real-World Analogy

A typical architectural plan can be slightly altered to better fit the client’s needs, similar to how the template method approach can be used in mass housing construction.

Pseudocode Example

A simple strategy video game uses the Template Method pattern to provide a “skeleton” for various branches of artificial intelligence.
AI classes for different races can reuse the same AI structure, while overriding some of the details.

Key Concepts

Template method defines the skeleton of an algorithm.
Concrete subclasses implement abstract operations, but leave the template method intact.
A class can have several template methods.
Subclasses must implement all abstract operations of the base class but must not override the template method itself.

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Description

Learn about the Template Method design pattern, which helps to avoid duplicate code in data mining applications that support multiple file formats.