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
- 29% duplication:
- 57,149 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 16,681 duplicated lines
- 6,885 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 160 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.ponl.po |
1362:1557 (11%)1370:1565 (11%) | view |
| 160 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.popl.po |
1362:1557 (11%)1392:1587 (10%) | view |
| 160 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po nl.popl.po |
1370:1565 (11%)1392:1587 (10%) | view |
| 99 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.ponl.po |
336:459 (6%)334:457 (6%) | view |
| 99 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po zh_CN.pozh_TW.po |
1372:1493 (6%)1372:1493 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po pl.pozh_CN.po |
1392:1511 (6%)1372:1491 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.pozh_CN.po |
1362:1481 (6%)1372:1491 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po nl.pozh_CN.po |
1370:1489 (6%)1372:1491 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.pozh_TW.po |
1362:1481 (6%)1372:1491 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po nl.pozh_TW.po |
1370:1489 (6%)1372:1491 (6%) | view |
| 97 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po pl.pozh_TW.po |
1392:1511 (6%)1372:1491 (6%) | view |
| 87 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po cs.poes.po |
1664:1767 (5%)1656:1759 (6%) | view |
| 87 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po es.ponl.po |
1656:1759 (6%)1666:1769 (5%) | view |
| 87 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po cs.ponl.po |
1664:1767 (5%)1666:1769 (5%) | view |
| 81 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po zh_CN.pozh_TW.po |
1675:1773 (5%)1675:1773 (5%) | view |
| 80 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po pl.pozh_TW.po |
1696:1792 (5%)1677:1773 (5%) | view |
| 80 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po cs.pozh_TW.po |
1673:1769 (5%)1677:1773 (5%) | view |
| 80 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po cs.pozh_CN.po |
1673:1769 (5%)1677:1773 (5%) | view |
| 80 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po cs.popl.po |
1673:1769 (5%)1696:1792 (5%) | view |
| 80 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation | po pl.pozh_CN.po |
1696:1792 (5%)1677:1773 (5%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 229 | x 2 | pgjdbc/src/main/java/org/postgresql/translationpgjdbc/src/main/java/org/postgresql/translation |  messages_zh_CN.javamessages_zh_TW.java |
5:234 5:234 | view |
| 33 | x 2 | pgjdbc/src/main/java/org/postgresqlpgjdbc/src/main/java/sof...aws/rds/jdbc/postgresql | Driver.javaDriver.java |
395:435 382:422 | view |
| 24 | x 2 | pgjdbc/src/main/java/org/postgresqlpgjdbc/src/main/java/sof...aws/rds/jdbc/postgresql | Driver.javaDriver.java |
359:385 345:372 | view |
| 18 | x 2 | benchmarks/src/jmh/java/...sql/benchmark/statementbenchmarks/src/jmh/java/...sql/benchmark/statement | ProcessResultSet.javaProcessResultSet.java |
183:201 203:221 | view |
| 11 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | ArrayEncoding.javaArrayEncoding.java |
565:577 612:624 | view |
| 10 | x 2 | pgjdbc/src/main/java/org/postgresql/corepgjdbc/src/main/java/org/postgresql/core | Parser.javaParser.java |
565:576 646:657 | view |
| 10 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | PgResultSet.javaPgPreparedStatement.java |
3985:3995 1635:1645 | view |
| 10 | x 2 | pgjdbc/src/main/java/org/postgresqlpgjdbc/src/main/java/sof...aws/rds/jdbc/postgresql | Driver.javaDriver.java |
662:672 635:645 | view |
| 10 | x 2 | test-gss/src/main/groovytest-gss/src/main/groovy |  PgJDBC.groovyPgJDBC.groovy |
55:65 68:78 | view |
| 9 | x 2 | pgjdbc/src/main/java/org/postgresql/gsspgjdbc/src/main/java/org/postgresql/gss | GssEncAction.javaGssAction.java |
48:59 49:60 | view |
| 9 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | ArrayEncoding.javaArrayEncoding.java |
439:448 480:489 | view |
| 8 | x 2 | pgjdbc/src/main/java/org/postgresql/corepgjdbc/src/main/java/org/postgresql/core | Parser.javaParser.java |
605:614 726:735 | view |
| 8 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | ArrayEncoding.javaArrayEncoding.java |
246:254 774:782 | view |
| 8 | x 2 | pgjdbc/src/main/java/org/postgresqlpgjdbc/src/main/java/sof...aws/rds/jdbc/postgresql | Driver.javaDriver.java |
707:715 677:685 | view |
| 7 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | PgResultSet.javaPgStatement.java |
1981:1988 957:964 | view |
| 6 | x 2 | pgjdbc/src/main/java/org/postgresql/largeobjectpgjdbc/src/main/java/org/postgresql/largeobject | LargeObject.javaLargeObject.java |
260:266 275:281 | view |
| 6 | x 2 | pgjdbc/src/main/java/org/postgresql/corepgjdbc/src/main/java/org/postgresql/core | BaseQueryKey.javaCallableQueryKey.java |
30:36 22:28 | view |
| 6 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | EscapedFunctions2.javaEscapedFunctions2.java |
212:218 356:362 | view |
| 6 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | EscapedFunctions.javaEscapedFunctions.java |
409:415 424:430 | view |
| 6 | x 2 | pgjdbc/src/main/java/org/postgresql/jdbcpgjdbc/src/main/java/org/postgresql/jdbc | EscapedFunctions.javaEscapedFunctions.java |
439:445 465:471 | view |