12/29/2023 0 Comments Salesforce duplicate detector apexSkip files which can't be tokenized due to invalid characters instead of aborting CPD.Įnables or disabled skipping of blocks like a pre-processor. With J2EE (CDI, Transaction Handling, etc)Īnd Spring (everything) annotations become very redundant. Which can be very redundant and trigger CPD matches. More and more modern frameworks use annotations on classes and methods, Similar to ignoreLiterals but for identifiers i.e., variable names, methods names, and so forth. To run PMD with this option off to start with and then switch it on to see what it turns up. ![]() ![]() This means that foo=42 and foo=43 will be seen as equivalent. If true, CPD ignores literal value differences when evaluating a duplicateīlock. ![]() If not specified, CPD uses the system default encoding. Indeed, CPD copy piece of source code in its report directly, therefore, the source files Let's say to UTF-8, but you are running CPD encoded with CP1252, you may end up with not UTF-8 file. A piece of warning, even if you set properly the encoding value, The character set encoding (e.g., UTF-8) to use when reading the source code files, but also when Required A positive integer indicating the minimum duplicate size. Minimum required options: Just give it the minimum duplicate size and the source directory: For Windows, just replace “./run.sh cpd” by “cpd.bat”. Note: The following example use the Linux start script. The first part is the start pattern, the second part is the ending pattern. It is a string property and contains of two parts, Ignore using directives in C# when comparing textĭo not skip code blocks matched by -skip-blocks-pattern Ignore sequences of literals (common e.g. Ignore language annotations (Java) or attributes (C#) when comparing text Ignore constant and variable names when comparing text Ignore number values and string contents when comparing text Skip files which can't be tokenized due to invalid characters instead of aborting CPDīy default CPD exits with status 4 if code duplications are found.ĭisable this option with -fail-on-violation false to exit with 0 instead and just write the report. Ignore multiple copies of files of the same name and length in comparison. If this is given, then you don't need to provide -files.Ĭharacter encoding to use when processing files. Path to file containing a comma delimited list of files to analyze. Required List of files and directories to process Required The minimum token length which should be reported as a duplicate. Novice as much as advanced readers may want to read on on Refactoring Guru for more in-depth strategies, use cases and explanations. Introduce a common ancestor to those class hierarchies.If the duplication occurs consistently in unrelated hierarchies:.Extract a method and pull it up in the class hierarchy, along with common fields.If the duplication occurs in siblings within a class hierarchy:.Extract the duplicated logic into a private method.Extract a local variable if the duplicated logic is not prohibitively long.If the duplication is local to a method or single class:. ![]() Once you have located some duplicates, several refactoring strategies may apply depending of the scope and extent of the duplication. We thus advise developers to use CPD to help remove duplicates, not to help keep duplicates in sync. If the duplicates are already there, then they should be refactored out. Otherwise, the most viable solution is to not duplicate. Now, if the code may never change in the future, then this is not a problem. Segments of code initially supposed to do the same thing may grow apart undetected upon further refactoring. This means the task of finding duplicates to keep them in sync when doing subsequent refactorings can no longer be entrusted to an automated tool – adding more burden on the maintainer. However, failure to keep the code in sync may mean automated tools will no longer recognise these blocks as duplicates. Automated tools like CPD can help with that to some extent. It’s certainly important to know where to get CPD, and how to call it, but it’s worth stepping back for a moment and asking yourself why you should care about this, being the occurrence of duplicate code blocks.Īssuming duplicated blocks of code are supposed to do the same thing, any refactoring, even simple, must be duplicated too – which is unrewarding grunt work, and puts pressure on the developer to find every place in which to perform the refactoring. It can also be run with Maven by using the cpd-check goal on the Maven PMD Plugin. It can be used via command-line, or via an Ant task. Duplicate code can be hard to find, especially in a large project.īut PMD’s Copy/Paste Detector (CPD) can find it for you!ĬPD works with Java, JSP, C/C++, C#, Go, Kotlin, Ruby, Swift and many more languages.
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