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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?
What is the main goal of the Template Method pattern in the context of the data mining application?
How does the Template Method pattern address the issue of client code with multiple conditionals?
How does the Template Method pattern address the issue of client code with multiple conditionals?
What is the role of the base class in the Template Method pattern?
What is the role of the base class in the Template Method pattern?
What is the advantage of using a Template Method pattern in the data mining application?
What is the advantage of using a Template Method pattern in the data mining application?
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What is the primary focus of the Template Method pattern?
What is the primary focus of the Template Method pattern?
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How does the Template Method pattern address the issue of code duplication in the data mining application?
How does the Template Method pattern address the issue of code duplication in the data mining application?
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What is the role of the client code in the Template Method pattern?
What is the role of the client code in the Template Method pattern?
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What is the benefit of using a Template Method pattern in the context of the data mining application?
What is the benefit of using a Template Method pattern in the context of the data mining application?
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What is the main purpose of the Template Method pattern in the context of the game AI?
What is the main purpose of the Template Method pattern in the context of the game AI?
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What type of steps are declared as abstract in the Template Method pattern?
What type of steps are declared as abstract in the Template Method pattern?
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What is the purpose of hooks in the Template Method pattern?
What is the purpose of hooks in the Template Method pattern?
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Which of the following is an example of the Template Method pattern in real life?
Which of the following is an example of the Template Method pattern in real life?
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What is the benefit of using the Template Method pattern in the game AI?
What is the benefit of using the Template Method pattern in the game AI?
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What is the role of the abstract class in the Template Method pattern?
What is the role of the abstract class in the Template Method pattern?
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What is the difference between abstract steps and optional steps in the Template Method pattern?
What is the difference between abstract steps and optional steps in the Template Method pattern?
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What is the advantage of using the Template Method pattern in the context of the game AI?
What is the advantage of using the Template Method pattern in the context of the game AI?
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What is the relationship between the base class and the subclasses in the Template Method pattern?
What is the relationship between the base class and the subclasses in the Template Method pattern?
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What is the main difference between the Template Method pattern and other design patterns, such as Bridge or Composite?
What is the main difference between the Template Method pattern and other design patterns, such as Bridge or Composite?
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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.