[Solved] You are designing a document processing system where each document type requires a specific sequence of steps:... How should you apply the Template Method pattern here? | LLD

LLD - Behavioral Design Patterns — Part 1

You are designing a document processing system where each document type requires a specific sequence of steps: open, parse, validate, save, and close. You want to ensure the sequence is fixed but allow each document type to customize parsing and validation. How should you apply the Template Method pattern here?

ACreate a base class with a template method calling open, parse, validate, save, close; subclasses override parse and validate

BLet each subclass implement its own full process without a base class

CUse separate unrelated classes for each step without a fixed sequence

DMake all steps abstract and force subclasses to implement the entire process

Step-by-Step Solution

Solution:

Step 1: Identify fixed and customizable parts
The sequence (open, parse, validate, save, close) is fixed; parse and validate vary by document type.
Step 2: Apply Template Method pattern correctly
Create a base class with a template method that calls all steps in order. Subclasses override parse and validate to customize behavior.
Final Answer:
Create a base class with a template method calling open, parse, validate, save, close; subclasses override parse and validate -> Option A
Quick Check:
Fixed sequence + customizable steps = Template Method [OK]

Quick Trick: Fix sequence in base; override variable steps in subclasses [OK]

Common Mistakes:

MISTAKES

Not fixing the sequence in one place
Forcing subclasses to rewrite entire process
Ignoring the need for a template method
Separating steps without order control

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How should you apply the Template Method pattern here?

Step 1: Identify fixed and customizable parts

Step 2: Apply Template Method pattern correctly

Final Answer:

Quick Check:

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