if (instance == null) { instance = new ColumbaServer(); } return instance;
if ( currentPath == null) { // fall back to default path currentPath = DefaultConfigDirectory.getDefaultPath(); } return currentPath;
Clone fragments detected by clone detection tool
File path: /columba-1.4-src/core/src/main/java/org/columba/core/main/ColumbaServer.java File path: /columba-1.4-src/core/src/main/java/org/columba/core/config/DefaultConfigDirectory.java
Method name: ColumbaServer getColumbaServer() Method name: File getCurrentPath()
Number of AST nodes: 3 Number of AST nodes: 3
1
if (instance == null) {
1
if ( currentPath == null) {
2
			instance = new ColumbaServer
2
			// fall back to default path
3
();
3
			currentPath = DefaultConfigDirectory.getDefaultPath();
4
		}
4
		}
5

5
		return instance;
6
		return currentPath;
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)0.5
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    1
    if (instance == null)
    1
    if (instance == null)
    1
    if (currentPath == null)
    Differences
    Expression1Expression2Difference
    instancecurrentPathVARIABLE_NAME_MISMATCH
    org.columba.core.main.ColumbaServerjava.io.FileVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type org.columba.core.main.ColumbaServer of variable instance does not match with type java.io.File of variable currentPath
    • Make classes org.columba.core.main.ColumbaServer and java.io.File extend a common superclass
    1
    if (currentPath == null)
                                                                                                                  
    2
    currentPath = DefaultConfigDirectory.getDefaultPath();
    Preondition Violations
    Unmatched statement currentPath=DefaultConfigDirectory.getDefaultPath(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    2
    currentPath = DefaultConfigDirectory.getDefaultPath();
    2
    instance = new ColumbaServer();
    2
    instance = new ColumbaServer();
    Preondition Violations
    Unmatched statement instance=new ColumbaServer(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    Unmatched statement instance=new ColumbaServer(); cannot be moved before or after the extracted code, because it throws exception(s) that should be caught by a try block that will be extracted
                                                                    
                                                
    3
    return currentPath;
    Preondition Violations
    Unmatched return currentPath;
    3
    return currentPath;
    3
    return instance;
    3
    return instance;
    Preondition Violations
    Unmatched return instance;
                                          
    Precondition Violations (7)
    Row Violation
    1Type org.columba.core.main.ColumbaServer of variable instance does not match with type java.io.File of variable currentPath
    2Unmatched statement currentPath=DefaultConfigDirectory.getDefaultPath(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    3Unmatched statement instance=new ColumbaServer(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    4Unmatched statement instance=new ColumbaServer(); cannot be moved before or after the extracted code, because it throws exception(s) that should be caught by a try block that will be extracted
    5Unmatched return currentPath;
    6Unmatched return instance;
    7The refactoring of the clones is infeasible, because the number of macthed statements is equal to zero