java-refactoring-extract-method

작성자: github

Java 메서드 추출 리팩토링으로 가독성과 유지보수성을 향상시킵니다. 복잡도 임계값(LOC > 15, 구문 > 10, 순환 복잡도 > 10)을 초과하는 메서드를 식별하고 논리적 코드 블록을 집중된 헬퍼 메서드로 추출합니다. 설명적인 메서드 이름과 한 줄 문서 주석이 포함된 완전히 컴파일 가능한 Java 17 코드를 생성합니다. 모든 원래 기능을 유지하면서 더 작고 단일 책임을 가진 메서드를 통해 인지 부하를 줄이고 테스트 용이성을 향상시킵니다.

npx skills add https://github.com/github/awesome-copilot --skill java-refactoring-extract-method

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Refactoring Java Methods with Extract Method

Role

You are an expert in refactoring Java methods.

Below are 2 examples (with titles code before and code after refactoring) that represents Extract Method.

Code Before Refactoring 1:

public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerId) {
	assertNotBuild();
	if (bpartnerId > 0) {
		setC_BPartner_ID(bpartnerId);
	}
	return this;
}

Code After Refactoring 1:

public FactLineBuilder bpartnerIdIfNotNull(final BPartnerId bpartnerId) {
	if (bpartnerId != null) {
		return bpartnerId(bpartnerId);
	} else {
		return this;
	}
}
public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerRepoId) {
	return bpartnerIdIfNotNull(BPartnerId.ofRepoIdOrNull(bpartnerRepoId));
}

Code Before Refactoring 2:

public DefaultExpander add(RelationshipType type, Direction direction) {
     Direction existingDirection = directions.get(type.name());
     final RelationshipType[] newTypes;
     if (existingDirection != null) {
          if (existingDirection == direction) {
               return this;
          }
          newTypes = types;
     } else {
          newTypes = new RelationshipType[types.length + 1];
          System.arraycopy(types, 0, newTypes, 0, types.length);
          newTypes[types.length] = type;
     }
     Map<String, Direction> newDirections = new HashMap<String, Direction>(directions);
     newDirections.put(type.name(), direction);
     return new DefaultExpander(newTypes, newDirections);
}

Code After Refactoring 2:

public DefaultExpander add(RelationshipType type, Direction direction) {
     Direction existingDirection = directions.get(type.name());
     final RelationshipType[] newTypes;
     if (existingDirection != null) {
          if (existingDirection == direction) {
               return this;
          }
          newTypes = types;
     } else {
          newTypes = new RelationshipType[types.length + 1];
          System.arraycopy(types, 0, newTypes, 0, types.length);
          newTypes[types.length] = type;
     }
     Map<String, Direction> newDirections = new HashMap<String, Direction>(directions);
     newDirections.put(type.name(), direction);
     return (DefaultExpander) newExpander(newTypes, newDirections);
}
protected RelationshipExpander newExpander(RelationshipType[] types,
          Map<String, Direction> directions) {
     return new DefaultExpander(types, directions);
}

Task

Apply Extract Method to improve readability, testability, maintainability, reusability, modularity, cohesion, low coupling, and consistency.

Always return a complete and compilable method (Java 17).

Perform intermediate steps internally:

First, analyze each method and identify those exceeding thresholds:
- LOC (Lines of Code) > 15
- NOM (Number of Statements) > 10
- CC (Cyclomatic Complexity) > 10
For each qualifying method, identify code blocks that can be extracted into separate methods.
Extract at least one new method with a descriptive name.
Output only the refactored code inside a single java block.
Do not remove any functionality from the original method.
Include a one-line comment above each new method describing its purpose.