if (myInstance == null) { myInstance = new PGPPassChecker(); } return myInstance;
if (instance == null) { instance = new HelpManager(); } return instance;
Clone fragments detected by clone detection tool
File path: /columba-1.4-src/mail/src/main/java/org/columba/mail/pgp/PGPPassChecker.java File path: /columba-1.4-src/core/src/main/java/org/columba/core/help/HelpManager.java
Method name: PGPPassChecker getInstance() Method name: HelpManager getInstance()
Number of AST nodes: 3 Number of AST nodes: 3
1
if (myInstance == null) {
1
if (instance == null) {
2
			myInstance = new PGPPassChecker();
2
			instance = new HelpManager();
3
		}
3
		}
4

5
		return myInstance;
4
		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 (myInstance == null)
    1
    if (myInstance == null)
    1
    if (instance == null)
    Differences
    Expression1Expression2Difference
    myInstanceinstanceVARIABLE_NAME_MISMATCH
    org.columba.mail.pgp.PGPPassCheckerorg.columba.core.help.HelpManagerVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type org.columba.mail.pgp.PGPPassChecker of variable myInstance does not match with type org.columba.core.help.HelpManager of variable instance
    • Make classes org.columba.mail.pgp.PGPPassChecker and org.columba.core.help.HelpManager extend a common superclass
    1
    if (instance == null)
                                                                
    2
    instance = new HelpManager();
    2
    myInstance = new PGPPassChecker();
                                                                          
                                          
    3
    return instance;
    Preondition Violations
    Unmatched return instance;
    3
    return instance;
    3
    return myInstance;
    3
    return myInstance;
    Preondition Violations
    Unmatched return myInstance;
                                              
    Precondition Violations (3)
    Row Violation
    1Type org.columba.mail.pgp.PGPPassChecker of variable myInstance does not match with type org.columba.core.help.HelpManager of variable instance
    2Unmatched return instance;
    3Unmatched return myInstance;