veniq
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Published
20 hours ago •
cqfn
cqfn
SEMI algorithm chooses 1 line to extract
SEMI algorithm chooses 1 line to extract. Seems we consider extracting more than 3 lines, don't we?
DocumentElement getDocumentElement(int startOffset, int endOffset) throws BadLocationException {
readLock();
checkDocumentDirty();
try {
for(int i = 0; i < elements.size(); i++) {
DocumentElement de = elements.get(i);
if(de.getStartOffset() == startOffset &&
de.getEndOffset() == endOffset)
return de;
if(de.getStartOffset() > startOffset) break;
}
return null;
}finally{
readUnlock();
}
}
List<DocumentElement> getDocumentElements(int startOffset) throws BadLocationException {
readLock();
if(documentDirty) {
writeLock(); // This line is suggested to extract
try {
doc.readLock();
try {
elements.resort();
} finally {
doc.readUnlock();
}
}finally {
writeUnlock();
}
documentDirty = false;
}
try {
int elementIndex = elements.binarySearchForOffset(startOffset);
if(elementIndex < 0) {
return Collections.emptyList();
} else {
ArrayList<DocumentElement> found = new ArrayList<DocumentElement>();
found.add(elements.get(elementIndex));
int eli = elementIndex;
while(--eli >= 0) {
DocumentElement previous = elements.get(eli);
if(previous.getStartOffset() == startOffset) {
found.add(0, previous);
} else {
break;
}
}
while(++elementIndex < elements.size()) {
DocumentElement next = elements.get(elementIndex);
if(next.getStartOffset() == startOffset) {
found.add(next);
} else {
break;
}
}
return found;
}
}finally{
readUnlock();
}
}
writeLock(); // This line is suggested to extract
For the given file
1. class Example {
2. DocumentElement getDocumentElement(int startOffset, int endOffset) throws BadLocationException {
3. readLock();
4. checkDocumentDirty();
5. try {
6. for(int i = 0; i < elements.size(); i++) {
7. DocumentElement de = elements.get(i);
8. if(de.getStartOffset() == startOffset &&
9. de.getEndOffset() == endOffset)
10. return de;
11. if(de.getStartOffset() > startOffset) break;
12. }
13. return null;
14. }finally{
15. readUnlock();
16. }
17. }
18. List<DocumentElement> getDocumentElements(int startOffset) throws BadLocationException {
19. readLock();
20. if(documentDirty) {
21. writeLock(); // This line is suggested to extract
22. try {
23. doc.readLock();
24. try {
25. elements.resort();
26. } finally {
27. doc.readUnlock();
28. }
29. }finally {
30. writeUnlock();
31. }
32. documentDirty = false;
33. }
34. try {
35. int elementIndex = elements.binarySearchForOffset(startOffset);
36. if(elementIndex < 0) {
37. return Collections.emptyList();
38. } else {
39. ArrayList<DocumentElement> found = new ArrayList<DocumentElement>();
40. found.add(elements.get(elementIndex));
41. int eli = elementIndex;
42. while(--eli >= 0) {
43. DocumentElement previous = elements.get(eli);
44. if(previous.getStartOffset() == startOffset) {
45. found.add(0, previous);
46. } else {
47. break;
48. }
49. }
50. while(++elementIndex < elements.size()) {
51. DocumentElement next = elements.get(elementIndex);
52. if(next.getStartOffset() == startOffset) {
53. found.add(next);
54. } else {
55. break;
56. }
57. }
58. return found;
59. }
60. }finally{
61. readUnlock();
62. }
63. }
64. }
The result of creating extraction opportunities step is following:
8 opportunities found in method getDocumentElement in class Example in file Example.java:
0th extraction opportunity:
First statement: Statement expression on line 3
Last statement: Statement expression on line 3
1th extraction opportunity:
First statement: Statement expression on line 4
Last statement: Statement expression on line 4
2th extraction opportunity:
First statement: For statement on line 6
Last statement: Return statement on line 10
3th extraction opportunity:
First statement: If statement on line 11
Last statement: If statement on line 11
4th extraction opportunity:
First statement: Break statement on line 11
Last statement: Break statement on line 11
5th extraction opportunity:
First statement: Return statement on line 13
Last statement: Return statement on line 13
6th extraction opportunity:
First statement: Statement expression on line 15
Last statement: Statement expression on line 15
7th extraction opportunity:
First statement: For statement on line 6
Last statement: If statement on line 11
20 opportunities found in method getDocumentElements in class Example in file Example.java:
0th extraction opportunity:
First statement: Statement expression on line 19
Last statement: Statement expression on line 19
1th extraction opportunity:
First statement: If statement on line 20
Last statement: If statement on line 20
2th extraction opportunity:
First statement: Statement expression on line 21
Last statement: Statement expression on line 21
3th extraction opportunity:
First statement: Statement expression on line 23
Last statement: Statement expression on line 23
4th extraction opportunity:
First statement: Statement expression on line 25
Last statement: Statement expression on line 25
5th extraction opportunity:
First statement: Statement expression on line 27
Last statement: Statement expression on line 27
6th extraction opportunity:
First statement: Statement expression on line 30
Last statement: Statement expression on line 30
7th extraction opportunity:
First statement: Statement expression on line 32
Last statement: Statement expression on line 32
8th extraction opportunity:
First statement: Local variable declaration on line 35
Last statement: If statement on line 36
9th extraction opportunity:
First statement: Return statement on line 37
Last statement: Return statement on line 37
10th extraction opportunity:
First statement: Local variable declaration on line 39
Last statement: Statement expression on line 45
11th extraction opportunity:
First statement: Break statement on line 47
Last statement: Break statement on line 47
12th extraction opportunity:
First statement: While statement on line 50
Last statement: Statement expression on line 53
13th extraction opportunity:
First statement: Break statement on line 55
Last statement: Break statement on line 55
14th extraction opportunity:
First statement: Return statement on line 58
Last statement: Return statement on line 58
15th extraction opportunity:
First statement: Statement expression on line 61
Last statement: Statement expression on line 61
16th extraction opportunity:
First statement: Local variable declaration on line 35
Last statement: Statement expression on line 45
17th extraction opportunity:
First statement: Statement expression on line 19
Last statement: Statement expression on line 27
18th extraction opportunity:
First statement: Local variable declaration on line 35
Last statement: Statement expression on line 53
19th extraction opportunity:
First statement: Statement expression on line 19
Last statement: Statement expression on line 61
After filtering the kept opportunities are:
4 opportunities found in method getDocumentElement in class Example in file Example.java:
0th extraction opportunity:
First statement: Statement expression on line 3
Last statement: Statement expression on line 3
1th extraction opportunity:
First statement: Statement expression on line 4
Last statement: Statement expression on line 4
2th extraction opportunity:
First statement: Return statement on line 13
Last statement: Return statement on line 13
3th extraction opportunity:
First statement: Statement expression on line 15
Last statement: Statement expression on line 15
10 opportunities found in method getDocumentElements in class Example in file Example.java:
0th extraction opportunity:
First statement: Statement expression on line 19
Last statement: Statement expression on line 19
1th extraction opportunity:
First statement: Statement expression on line 21
Last statement: Statement expression on line 21
2th extraction opportunity:
First statement: Statement expression on line 23
Last statement: Statement expression on line 23
3th extraction opportunity:
First statement: Statement expression on line 25
Last statement: Statement expression on line 25
4th extraction opportunity:
First statement: Statement expression on line 27
Last statement: Statement expression on line 27
5th extraction opportunity:
First statement: Statement expression on line 30
Last statement: Statement expression on line 30
6th extraction opportunity:
First statement: Statement expression on line 32
Last statement: Statement expression on line 32
7th extraction opportunity:
First statement: Return statement on line 37
Last statement: Return statement on line 37
8th extraction opportunity:
First statement: Return statement on line 58
Last statement: Return statement on line 58
9th extraction opportunity:
First statement: Statement expression on line 61
Last statement: Statement expression on line 61
All kept extraction opportunities are single statements ones.
Ranking kept extraction opportunities we get:
Extraction opportunities groups of method getDocumentElement in class Example in file Example.java:
Extraction opportunities group with scope 15:
Extraction opportunity with score 15:
Statement expression on line 3
Extraction opportunities group with scope 15:
Extraction opportunity with score 15:
Statement expression on line 4
Extraction opportunities group with scope 15:
Extraction opportunity with score 15:
Return statement on line 13
Extraction opportunities group with scope 15:
Extraction opportunity with score 15:
Statement expression on line 15
Extraction opportunities groups of method getDocumentElements in class Example in file Example.java:
Extraction opportunities group with scope 43:
Extraction opportunity with score 43:
Statement expression on line 21
Extraction opportunities group with scope 43:
Extraction opportunity with score 43:
Statement expression on line 30
Extraction opportunities group with scope 43:
Extraction opportunity with score 43:
Return statement on line 37
Extraction opportunities group with scope 41:
Extraction opportunity with score 41:
Statement expression on line 19
Extraction opportunities group with scope 41:
Extraction opportunity with score 41:
Statement expression on line 32
Extraction opportunities group with scope 41:
Extraction opportunity with score 41:
Statement expression on line 61
Extraction opportunities group with scope 39:
Extraction opportunity with score 39:
Statement expression on line 23
Extraction opportunities group with scope 39:
Extraction opportunity with score 39:
Statement expression on line 27
Extraction opportunities group with scope 35:
Extraction opportunity with score 35:
Return statement on line 58
Extraction opportunities group with scope 33:
Extraction opportunity with score 33:
Statement expression on line 25
Each group consist of a single opportunity. The one with highest score in getDocumentElements method suggests to extract the statement you marked.
Issues based on findings:
- Find structure/syntactic statements connections instead of semantic connection
- Instead of filtering transform opportunities by adding statements
- Instead of greedy clustering start opportunity from all statements
- Instead of start search from lines start from variables/objects