DigestInputStream dis = new DigestInputStream(fis, messageDigest); while (dis.read(buf, 0, readBufferSize) != -1) { // Empty statement } dis.close(); fis.close(); fis = null; byte[] fileDigest = messageDigest.digest ();
DigestInputStream dis = new DigestInputStream(fis, messageDigest); while (dis.read(buf, 0, readBufferSize) != -1) { // do nothing } dis.close(); fis.close(); fis = null; byte[] fileDigest = messageDigest.digest();
Clone fragments detected by clone detection tool
File path: /apache-ant-1.7.0/src/org/apache/tools/ant/taskdefs/Checksum.java File path: /apache-ant-1.7.0/src/org/apache/tools/ant/types/selectors/modifiedselector/DigestAlgorithm.java
Method name: boolean generateChecksums() Method name: String getValue(File)
Number of AST nodes: 6 Number of AST nodes: 6
1
DigestInputStream dis = new DigestInputStream(fis,
1
DigestInputStream dis = new DigestInputStream(fis,
2
                                                              messageDigest);
2
                                                              messageDigest);
3
                while (dis.read(buf, 0, readBufferSize) != -1) {
3
                while (dis.read(buf, 0, readBufferSize) != -1) {
4
                    // Empty statement
4
                    // do nothing
5
                }
5
                }
6
                dis.close();
6
                dis.close();
7
                fis.close();
7
                fis.close();
8
                fis = null;
8
                fis = null;
9
                byte[] fileDigest = messageDigest.digest ();
9
                byte[] fileDigest = messageDigest.digest();
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)1.1
Clones locationClones are in different classes
Number of node comparisons20
  1. {Non-refactorable}
    Mapping Summary
    Number of mapped statements5
    Number of unmapped statements in the first code fragment1
    Number of unmapped statements in the second code fragment1
    Time elapsed for statement mapping (ms)4.8
    Clone typeType 2
    Mapped Statements
    ID Statement ID Statement
    12
    DigestInputStream dis = new DigestInputStream(fis, messageDigest);
    11
    DigestInputStream dis = new DigestInputStream(fis, messageDigest);
    13
    while (dis.read(buf, 0, readBufferSize) != -1)
    12
    while (dis.read(buf, 0, readBufferSize) != -1)
    14
    dis.close();
    13
    dis.close();
    15
    fis.close();
    14
    fis.close();
    16
    fis = null;
    15
    fis = null;
                                                                                              
    16
    byte[] fileDigest = messageDigest.digest();
    Preondition Violations
    Unmatched statement byte[] fileDigest=messageDigest.digest(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    16
    byte[] fileDigest = messageDigest.digest();
    17
    byte[] fileDigest = messageDigest.digest();
    17
    byte[] fileDigest = messageDigest.digest();
    Preondition Violations
    Unmatched statement byte[] fileDigest=messageDigest.digest(); cannot be moved before or after the extracted code, because it has dependencies to/from statements that will be extracted
                                                                                              
    Precondition Violations (4)
    Row Violation
    1Unmatched statement byte[] fileDigest=messageDigest.digest(); cannot be moved before the extracted code, because it has control dependencies from statements that will be extracted
    2Unmatched statement byte[] fileDigest=messageDigest.digest(); cannot be moved before or after the extracted code, because it has dependencies to/from statements that will be extracted
    3Clone fragment #1 returns variables fis, fileDigest , while Clone fragment #2 returns variables fileDigest
    4The refactoring of the clones is infeasible, because classes org.apache.tools.ant.taskdefs.Checksum and org.apache.tools.ant.types.selectors.modifiedselector.DigestAlgorithm do not have a common superclass