Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 69% duplication:
- 3,580 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 2,497 duplicated lines
- 1,442 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
aws-datasync-locationnfs (74%)
--> aws-datasync-locationobjectstorage (77%)
590
31 file pairs
details...
aws-datasync-locationefs (78%)
--> aws-datasync-locationfsxwindows (79%)
577
31 file pairs
details...
aws-datasync-locationefs (78%)
--> aws-datasync-locations3 (78%)
574
31 file pairs
details...
aws-datasync-locationefs (77%)
--> aws-datasync-locationnfs (71%)
566
31 file pairs
details...
aws-datasync-locationfsxwindows (78%)
--> aws-datasync-locations3 (77%)
565
31 file pairs
details...
aws-datasync-locationobjectstorage (73%)
--> aws-datasync-locationsmb (71%)
560
31 file pairs
details...
aws-datasync-locationnfs (69%)
--> aws-datasync-locations3 (75%)
554
31 file pairs
details...
aws-datasync-locationefs (75%)
--> aws-datasync-locationobjectstorage (72%)
552
31 file pairs
details...
aws-datasync-locationobjectstorage (72%)
--> aws-datasync-locations3 (75%)
552
31 file pairs
details...
aws-datasync-locationnfs (69%)
--> aws-datasync-locationsmb (70%)
552
31 file pairs
details...
aws-datasync-locationfsxwindows (75%)
--> aws-datasync-locationnfs (69%)
548
31 file pairs
details...
aws-datasync-locationfsxwindows (74%)
--> aws-datasync-locationobjectstorage (70%)
536
31 file pairs
details...
aws-datasync-locations3 (71%)
--> aws-datasync-locationsmb (66%)
526
31 file pairs
details...
aws-datasync-locationefs (71%)
--> aws-datasync-locationsmb (66%)
522
31 file pairs
details...
aws-datasync-locationhdfs (57%)
--> aws-datasync-locationnfs (65%)
521
29 file pairs
details...
aws-datasync-locationfsxwindows (72%)
--> aws-datasync-locationsmb (66%)
520
31 file pairs
details...
aws-datasync-locationhdfs (57%)
--> aws-datasync-locationobjectstorage (68%)
519
29 file pairs
details...
aws-datasync-locationhdfs (57%)
--> aws-datasync-locationsmb (65%)
517
30 file pairs
details...
aws-datasync-locationefs (69%)
--> aws-datasync-locationhdfs (56%)
510
29 file pairs
details...
aws-datasync-locationfsxwindows (70%)
--> aws-datasync-locationhdfs (56%)
508
29 file pairs
details...
aws-datasync-locationhdfs (55%)
--> aws-datasync-locations3 (68%)
498
29 file pairs
details...
aws-datasync-locations3 (65%)
--> aws-datasync-task (50%)
478
31 file pairs
details...
aws-datasync-locationobjectstorage (61%)
--> aws-datasync-task (49%)
466
31 file pairs
details...
aws-datasync-locationnfs (57%)
--> aws-datasync-task (47%)
454
31 file pairs
details...
aws-datasync-locationsmb (57%)
--> aws-datasync-task (47%)
454
31 file pairs
details...
aws-datasync-locationefs (61%)
--> aws-datasync-task (47%)
452
31 file pairs
details...
aws-datasync-locationfsxwindows (62%)
--> aws-datasync-task (47%)
450
31 file pairs
details...
aws-datasync-locationhdfs (47%)
--> aws-datasync-task (45%)
428
29 file pairs
details...
aws-datasync-agent (37%)
--> aws-datasync-locationfsxwindows (39%)
285
18 file pairs
details...
aws-datasync-agent (37%)
--> aws-datasync-locationefs (38%)
285
18 file pairs
details...
aws-datasync-agent (37%)
--> aws-datasync-locations3 (38%)
285
18 file pairs
details...
aws-datasync-agent (37%)
--> aws-datasync-locationobjectstorage (37%)
283
18 file pairs
details...
aws-datasync-agent (36%)
--> aws-datasync-locationsmb (35%)
281
18 file pairs
details...
aws-datasync-agent (36%)
--> aws-datasync-locationnfs (34%)
277
18 file pairs
details...
aws-datasync-agent (35%)
--> aws-datasync-locationhdfs (29%)
267
17 file pairs
details...
aws-datasync-agent (34%)
--> aws-datasync-task (27%)
265
18 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| aws-datasync-locationnfs (74%) --> aws-datasync-locationobjectstorage (77%) |
590 | 31 file pairs | details... |
| aws-datasync-locationefs (78%) --> aws-datasync-locationfsxwindows (79%) |
577 | 31 file pairs | details... |
| aws-datasync-locationefs (78%) --> aws-datasync-locations3 (78%) |
574 | 31 file pairs | details... |
| aws-datasync-locationefs (77%) --> aws-datasync-locationnfs (71%) |
566 | 31 file pairs | details... |
| aws-datasync-locationfsxwindows (78%) --> aws-datasync-locations3 (77%) |
565 | 31 file pairs | details... |
| aws-datasync-locationobjectstorage (73%) --> aws-datasync-locationsmb (71%) |
560 | 31 file pairs | details... |
| aws-datasync-locationnfs (69%) --> aws-datasync-locations3 (75%) |
554 | 31 file pairs | details... |
| aws-datasync-locationefs (75%) --> aws-datasync-locationobjectstorage (72%) |
552 | 31 file pairs | details... |
| aws-datasync-locationobjectstorage (72%) --> aws-datasync-locations3 (75%) |
552 | 31 file pairs | details... |
| aws-datasync-locationnfs (69%) --> aws-datasync-locationsmb (70%) |
552 | 31 file pairs | details... |
| aws-datasync-locationfsxwindows (75%) --> aws-datasync-locationnfs (69%) |
548 | 31 file pairs | details... |
| aws-datasync-locationfsxwindows (74%) --> aws-datasync-locationobjectstorage (70%) |
536 | 31 file pairs | details... |
| aws-datasync-locations3 (71%) --> aws-datasync-locationsmb (66%) |
526 | 31 file pairs | details... |
| aws-datasync-locationefs (71%) --> aws-datasync-locationsmb (66%) |
522 | 31 file pairs | details... |
| aws-datasync-locationhdfs (57%) --> aws-datasync-locationnfs (65%) |
521 | 29 file pairs | details... |
| aws-datasync-locationfsxwindows (72%) --> aws-datasync-locationsmb (66%) |
520 | 31 file pairs | details... |
| aws-datasync-locationhdfs (57%) --> aws-datasync-locationobjectstorage (68%) |
519 | 29 file pairs | details... |
| aws-datasync-locationhdfs (57%) --> aws-datasync-locationsmb (65%) |
517 | 30 file pairs | details... |
| aws-datasync-locationefs (69%) --> aws-datasync-locationhdfs (56%) |
510 | 29 file pairs | details... |
| aws-datasync-locationfsxwindows (70%) --> aws-datasync-locationhdfs (56%) |
508 | 29 file pairs | details... |
| aws-datasync-locationhdfs (55%) --> aws-datasync-locations3 (68%) |
498 | 29 file pairs | details... |
| aws-datasync-locations3 (65%) --> aws-datasync-task (50%) |
478 | 31 file pairs | details... |
| aws-datasync-locationobjectstorage (61%) --> aws-datasync-task (49%) |
466 | 31 file pairs | details... |
| aws-datasync-locationnfs (57%) --> aws-datasync-task (47%) |
454 | 31 file pairs | details... |
| aws-datasync-locationsmb (57%) --> aws-datasync-task (47%) |
454 | 31 file pairs | details... |
| aws-datasync-locationefs (61%) --> aws-datasync-task (47%) |
452 | 31 file pairs | details... |
| aws-datasync-locationfsxwindows (62%) --> aws-datasync-task (47%) |
450 | 31 file pairs | details... |
| aws-datasync-locationhdfs (47%) --> aws-datasync-task (45%) |
428 | 29 file pairs | details... |
| aws-datasync-agent (37%) --> aws-datasync-locationfsxwindows (39%) |
285 | 18 file pairs | details... |
| aws-datasync-agent (37%) --> aws-datasync-locationefs (38%) |
285 | 18 file pairs | details... |
| aws-datasync-agent (37%) --> aws-datasync-locations3 (38%) |
285 | 18 file pairs | details... |
| aws-datasync-agent (37%) --> aws-datasync-locationobjectstorage (37%) |
283 | 18 file pairs | details... |
| aws-datasync-agent (36%) --> aws-datasync-locationsmb (35%) |
281 | 18 file pairs | details... |
| aws-datasync-agent (36%) --> aws-datasync-locationnfs (34%) |
277 | 18 file pairs | details... |
| aws-datasync-agent (35%) --> aws-datasync-locationhdfs (29%) |
267 | 17 file pairs | details... |
| aws-datasync-agent (34%) --> aws-datasync-task (27%) |
265 | 18 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 67 | x 2 | aws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locations3/...zon/datasync/locations3 |  TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfs | TagRequestMaker.javaTagRequestMaker.java |
31:137 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locations3/...zon/datasync/locations3aws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationobj...c/locationobjectstorage | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationfsx...sync/locationfsxwindowsaws-datasync-locationobj...c/locationobjectstorage | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationfsx...sync/locationfsxwindowsaws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationfsx...sync/locationfsxwindowsaws-datasync-locationhdf...n/datasync/locationhdfs | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)31:137 (100%) | view |
| 67 | x 2 | aws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationobj...c/locationobjectstorage | TagRequestMaker.javaTagRequestMaker.java |
31:137 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationfsx...sync/locationfsxwindowsaws-datasync-locationnfs...on/datasync/locationnfs | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationefs...on/datasync/locationefsaws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationobj...c/locationobjectstorage | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationfsx...sync/locationfsxwindowsaws-datasync-locations3/...zon/datasync/locations3 | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationfsx...sync/locationfsxwindows | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationnfs...on/datasync/locationnfs | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3 | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
31:137 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationhdf...n/datasync/locationhdfs | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)31:137 (100%) | view |
| 67 | x 2 | aws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locations3/...zon/datasync/locations3 | TagRequestMaker.javaTagRequestMaker.java |
31:137 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
| 67 | x 2 | aws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-task/src/ma...re/amazon/datasync/task | TagRequestMaker.javaTagRequestMaker.java |
25:131 (100%)25:131 (100%) | view |
Duplicated Units
The list of top 12 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 57 | x 7 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.java |
69:134 69:134 69:134 69:134 75:140 69:134 69:134 | view |
| 33 | x 4 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfs | ListHandler.javaListHandler.javaListHandler.javaListHandler.java |
24:63 24:63 24:63 24:63 | view |
| 33 | x 3 | aws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationfsx...sync/locationfsxwindows | ListHandler.javaListHandler.javaListHandler.java |
24:63 24:62 24:63 | view |
| 19 | x 8 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.javaTagRequestMaker.java |
36:57 36:57 36:57 36:57 36:57 42:63 36:57 36:57 | view |
| 19 | x 6 | aws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | DeleteHandler.javaDeleteHandler.javaDeleteHandler.javaDeleteHandler.javaDeleteHandler.javaDeleteHandler.java |
20:43 18:40 18:42 18:42 18:42 18:40 | view |
| 9 | x 3 | aws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationfsx...sync/locationfsxwindows | UpdateHandler.javaUpdateHandler.javaUpdateHandler.java |
14:26 14:27 14:26 | view |
| 6 | x 9 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-agent/src/m...e/amazon/datasync/agentaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | Translator.javaTranslator.javaTranslator.javaTranslator.javaTranslator.javaTranslator.javaTranslator.javaTranslator.javaTranslator.java |
67:73 64:70 64:70 84:90 114:120 158:164 178:184 97:103 52:58 | view |
| 6 | x 9 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-agent/src/m...e/amazon/datasync/agentaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.java |
36:42 36:42 36:42 36:42 75:81 36:42 36:42 36:42 36:42 | view |
| 6 | x 9 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-agent/src/m...e/amazon/datasync/agentaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.java |
44:50 44:50 44:50 44:50 84:90 44:50 44:50 44:50 44:50 | view |
| 6 | x 9 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-agent/src/m...e/amazon/datasync/agentaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.java |
58:64 58:64 58:64 58:64 98:104 58:64 58:64 58:64 58:64 | view |
| 6 | x 9 | aws-datasync-locationobj...c/locationobjectstorageaws-datasync-locations3/...zon/datasync/locations3aws-datasync-locationefs...on/datasync/locationefsaws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-agent/src/m...e/amazon/datasync/agentaws-datasync-task/src/ma...re/amazon/datasync/taskaws-datasync-locationhdf...n/datasync/locationhdfsaws-datasync-locationnfs...on/datasync/locationnfsaws-datasync-locationfsx...sync/locationfsxwindows | TagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.javaTagTranslator.java |
66:72 66:72 66:72 66:72 106:112 66:72 66:72 66:72 66:72 | view |
| 6 | x 2 | aws-datasync-locationsmb...on/datasync/locationsmbaws-datasync-locationnfs...on/datasync/locationnfs | Translator.javaTranslator.java |
76:82 70:76 | view |