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?

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

    What is the primary focus of the Template Method pattern?

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

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

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

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

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

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

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

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

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

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

    <p>Abstract steps</p> Signup and view all the answers

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

    <p>To provide an optional extension point for the algorithm</p> Signup and view all the answers

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

    <p>Designing a new architectural plan</p> Signup and view all the answers

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

    <p>It enables code reuse and reduces duplication</p> Signup and view all the answers

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

    <p>It defines the skeleton of an algorithm and declares abstract operations</p> Signup and view all the answers

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

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

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

    <p>It enables code reuse and flexibility</p> Signup and view all the answers

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

    <p>The base class defines the skeleton of an algorithm, and the subclasses implement specific steps</p> 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?

    <p>The Template Method pattern focuses on algorithms, while Bridge and Composite focus on object structure</p> 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.

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