if (charset == null) { charset = Charset.forName(System.getProperty("file.encoding")); } return charset;
if (myInstance == null) { myInstance = new NullWorkerStatusController(); } return myInstance;
Clone fragments detected by clone detection tool
File path: /columba-1.4-src/mail/src/main/java/org/columba/mail/gui/composer/ComposerModel.java File path: /columba-1.4-src/core/src/main/java/org/columba/core/command/NullWorkerStatusController.java
Method name: Charset getCharset() Method name: NullWorkerStatusController getInstance()
Number of AST nodes: 3 Number of AST nodes: 3
1
if (charset == null) {
1
if (myInstance == null) {
2
			charset = Charset.forName(System.getProperty("file.encoding"));
2
	    myInstance = new NullWorkerStatusController();
3
		}
3
	}
4
		return charset;
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)0.6
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    1
    if (charset == null)
    1
    if (charset == null)
    1
    if (myInstance == null)
    Differences
    Expression1Expression2Difference
    charsetmyInstanceVARIABLE_NAME_MISMATCH
    java.nio.charset.Charsetorg.columba.core.command.NullWorkerStatusControllerVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type java.nio.charset.Charset of variable charset does not match with type org.columba.core.command.NullWorkerStatusController of variable myInstance
    • Make classes java.nio.charset.Charset and org.columba.core.command.NullWorkerStatusController extend a common superclass
    1
    if (myInstance == null)
                                                                                                  
    2
    myInstance = new NullWorkerStatusController();
    Preondition Violations
    Unmatched statement myInstance=new NullWorkerStatusController(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    2
    myInstance = new NullWorkerStatusController();
    2
    charset = Charset.forName(System.getProperty("file.encoding"));
    2
    charset = Charset.forName(System.getProperty("file.encoding"));
    Preondition Violations
    Unmatched statement charset=Charset.forName(System.getProperty("file.encoding")); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
                                                                                                                                    
                                              
    3
    return myInstance;
    Preondition Violations
    Unmatched return myInstance;
    3
    return myInstance;
    3
    return charset;
    3
    return charset;
    Preondition Violations
    Unmatched return charset;
                                        
    Precondition Violations (6)
    Row Violation
    1Type java.nio.charset.Charset of variable charset does not match with type org.columba.core.command.NullWorkerStatusController of variable myInstance
    2Unmatched statement myInstance=new NullWorkerStatusController(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    3Unmatched statement charset=Charset.forName(System.getProperty("file.encoding")); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    4Unmatched return myInstance;
    5Unmatched return charset;
    6The refactoring of the clones is infeasible, because the number of macthed statements is equal to zero