if (serviceInstance == null) { // load instance of service serviceInstance = loadInstance(implementationName); } return serviceInstance;
if (myInstance == null) { myInstance = new MHMessageFileFilter(); } return myInstance;
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/mail/src/main/java/org/columba/mail/folder/mh/MHMessageFileFilter.java
Method name: Object getServiceInstance() Method name: MHMessageFileFilter getInstance()
Number of AST nodes: 3 Number of AST nodes: 3
1
if (serviceInstance == null) {
1
if (myInstance == null) {
2
				// load instance of service
3
				serviceInstance = loadInstance(implementationName);
4
			}
5
			return service
2
            myInstance = new MHMessageFileFilter();
3
        }
6
Instance;
4
        return myInstance;
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)0.3
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    1
    if (serviceInstance == null)
    1
    if (serviceInstance == null)
    1
    if (myInstance == null)
    Differences
    Expression1Expression2Difference
    serviceInstancemyInstanceVARIABLE_NAME_MISMATCH
    java.lang.Objectorg.columba.mail.folder.mh.MHMessageFileFilterVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type java.lang.Object of variable serviceInstance does not match with type org.columba.mail.folder.mh.MHMessageFileFilter of variable myInstance
    • Make classes java.lang.Object and org.columba.mail.folder.mh.MHMessageFileFilter extend a common superclass
    1
    if (myInstance == null)
                                                                                    
    2
    myInstance = new MHMessageFileFilter();
    2
    serviceInstance = loadInstance(implementationName);
                                                                                                            
                                              
    3
    return myInstance;
    Preondition Violations
    Unmatched return myInstance;
    3
    return myInstance;
    3
    return serviceInstance;
    3
    return serviceInstance;
    Preondition Violations
    Unmatched return serviceInstance;
                                                        
    Precondition Violations (3)
    Row Violation
    1Type java.lang.Object of variable serviceInstance does not match with type org.columba.mail.folder.mh.MHMessageFileFilter of variable myInstance
    2Unmatched return myInstance;
    3Unmatched return serviceInstance;