Java Refactoring Extract Method

--- name: java-refactoring-extract-method description: 'Refactoring using Extract Methods in Java Language' --- # 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: ```java public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerId) { assertNotBuild(); if (bpartnerId > 0) { setC_BPartner_ID(bpartnerId); } return this; } ``` ## Code After Refactoring 1: ```java 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: ```java 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 newDirections = new HashMap(directions); newDirections.put(type.name(), direction); return new DefaultExpander(newTypes, newDirections); } ``` ## Code After Refactoring 2: ```java 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 newDirections = new HashMap(directions); newDirections.put(type.name(), direction); return (DefaultExpander) newExpander(newTypes, newDirections); } protected RelationshipExpander newExpander(RelationshipType[] types, Map 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. ## Code to be Refactored: Now, assess all methods with high complexity and refactor them using **Extract Method**