템플릿 메서드

Python code

from abc import ABC, abstractmethod

class DataProcessor(ABC):
    """알고리즘 골격 정의"""
    def process(self, data: str) -> str:
        parsed = self.parse(data)
        validated = self.validate(parsed)
        transformed = self.transform(validated)
        return self.format_output(transformed)

    @abstractmethod
    def parse(self, raw: str) -> list: ...

    @abstractmethod
    def validate(self, data: list) -> list: ...

    def transform(self, data: list) -> list:
        """기본 구현 (오버라이드 가능)"""
        return data

    @abstractmethod
    def format_output(self, data: list) -> str: ...

class CSVProcessor(DataProcessor):
    def parse(self, raw: str) -> list:
        return [line.split(",") for line in raw.strip().split("\n")]

    def validate(self, data: list) -> list:
        return [row for row in data if len(row) >= 2]

    def transform(self, data: list) -> list:
        return [[col.strip().upper() for col in row] for row in data]

    def format_output(self, data: list) -> str:
        return "\n".join(" | ".join(row) for row in data)

class JSONProcessor(DataProcessor):
    def parse(self, raw: str) -> list:
        import json
        return json.loads(raw)

    def validate(self, data: list) -> list:
        return [d for d in data if "name" in d]

    def format_output(self, data: list) -> str:
        return ", ".join(d.get("name", "?") for d in data)

csv_proc = CSVProcessor()
print(csv_proc.process("Alice, 30\nBob, 25\n, "))

json_proc = JSONProcessor()
print(json_proc.process('[{"name":"Alice"},{"age":30},{"name":"Bob"}]'))