if (instance == null) { synchronized (TagManager.class) { if (instance == null) instance = new TagManager(); } } return instance;
if (instance == null) { synchronized (AssociationStore.class) { if (instance == null) instance = new AssociationStore(); } } return instance;
Clone fragments detected by clone detection tool
File path: /columba-1.4-src/core/src/main/java/org/columba/core/tagging/TagManager.java File path: /columba-1.4-src/core/src/main/java/org/columba/core/association/AssociationStore.java
Method name: TagManager getInstance() Method name: AssociationStore getInstance()
Number of AST nodes: 5 Number of AST nodes: 5
1
if (instance == null) {
1
if (instance == null) {
2
			synchronized (TagManager.class) {
2
			synchronized (AssociationStore.class) {
3
				if (instance == null)
3
				if (instance == null)
4
					instance = new TagManager();
4
					instance = new AssociationStore();
5
			}
5
			}
6
		}
6
		}
7
		return instance;
7
		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)0.2
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 fragment1
    Number of unmapped statements in the second code fragment1
    Time elapsed for statement mapping (ms)0.4
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    3
    if (instance == null)
    3
    if (instance == null)
    3
    if (instance == null)
    Differences
    Expression1Expression2Difference
    org.columba.core.tagging.TagManagerorg.columba.core.association.AssociationStoreVARIABLE_TYPE_MISMATCH
    Preondition Violations
    Type org.columba.core.tagging.TagManager of variable instance does not match with type org.columba.core.association.AssociationStore of variable instance
    • Make classes org.columba.core.tagging.TagManager and org.columba.core.association.AssociationStore extend a common superclass
    3
    if (instance == null)
                                                                          
    4
    instance = new AssociationStore();
    4
    instance = new TagManager();
                                                              
    Precondition Violations (1)
    Row Violation
    1Type org.columba.core.tagging.TagManager of variable instance does not match with type org.columba.core.association.AssociationStore of variable instance