if (serviceInstance == null) { // load instance of service serviceInstance = loadInstance(implementationName); } return serviceInstance;
if (instance == null) { instance = new ColumbaCmdLineParser(); } return instance;
Clone fragments detected by clone detection tool
File path: /columba-1.4-src/core/src/main/java/org/columba/core/facade/ServiceFacadeRegistry.java File path: /columba-1.4-src/core/src/main/java/org/columba/core/main/ColumbaCmdLineParser.java
Method name: Object getServiceInstance() Method name: ColumbaCmdLineParser getInstance()
Number of AST nodes: 3 Number of AST nodes: 3
1
if (serviceInstance == null) {
1
if (instance == null) {
2
				// load instance of service
2
			
3
				serviceInstance = loadInstance(implementationName);
3
instance = new ColumbaCmdLineParser();
4
			}
4
		}
5
			return serviceInstance;
5
		return instance;
Summary
Number of common nesting structure subtrees1
Number of refactorable cases0
Number of non-refactorable cases1
Time elapsed for finding largest common nesting structure subtrees (ms)0.1
Clones locationClones are in different classes
Number of node comparisons5
  1. {Non-refactorable}
    Mapping Summary
    Number of mapped statements1
    Number of unmapped statements in the first code fragment2
    Number of unmapped statements in the second code fragment2
    Time elapsed for statement mapping (ms)0.4
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    1
    if (serviceInstance == null)
    1
    if (serviceInstance == null)
    1
    if (instance == null)
    Differences
    Expression1Expression2Difference
    serviceInstanceinstanceVARIABLE_NAME_MISMATCH
    java.lang.Objectorg.columba.core.main.ColumbaCmdLineParserVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type java.lang.Object of variable serviceInstance does not match with type org.columba.core.main.ColumbaCmdLineParser of variable instance
    • Make classes java.lang.Object and org.columba.core.main.ColumbaCmdLineParser extend a common superclass
    1
    if (instance == null)
                                                                                  
    2
    instance = new ColumbaCmdLineParser();
    Preondition Violations
    Unmatched statement instance=new ColumbaCmdLineParser(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    2
    instance = new ColumbaCmdLineParser();
    2
    serviceInstance = loadInstance(implementationName);
    2
    serviceInstance = loadInstance(implementationName);
    Preondition Violations
    Unmatched statement serviceInstance=loadInstance(implementationName); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
                                                                                                            
                                          
    3
    return instance;
    Preondition Violations
    Unmatched return instance;
    3
    return instance;
    3
    return serviceInstance;
    3
    return serviceInstance;
    Preondition Violations
    Unmatched return serviceInstance;
                                                        
    Precondition Violations (6)
    Row Violation
    1Type java.lang.Object of variable serviceInstance does not match with type org.columba.core.main.ColumbaCmdLineParser of variable instance
    2Unmatched statement instance=new ColumbaCmdLineParser(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    3Unmatched statement serviceInstance=loadInstance(implementationName); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    4Unmatched return instance;
    5Unmatched return serviceInstance;
    6The refactoring of the clones is infeasible, because the number of macthed statements is equal to zero