Use java.nio.file.path instead of org.apache.commons.io.FilenameUtils

[guwirth]

@Bertk: Yes, we should use more Java 7 methods and replace this Strings class with Path class. I also feel we should remove dependency to org.apache.commons.io.FilenameUtils in CxxReportSensor.java and use java.nio.file.path.
https://docs.oracle.com/javase/tutorial/essential/io/pathOps.html
https://docs.oracle.com/javase/8/docs/api/java/nio/file/Path.html

[guwirth]

@Bertk: What is the advantage?

[Bertk]

Currently we use strings for paths and file names. Java 7 has a rich feature set for file&path and especially the relativize method (http://docs.oracle.com/javase/7/docs/api/java/nio/file/Path.html#relativize(java.nio.file.Path) which is helpful for the sensors. I expect some cleaner code and we should use nio methods or SQ InputFile in org.sonar.plugins.cxx.utils.

I also want to investigate a problem with CppCheck sensor which did not create issues for sources in sub-folders.

[jmecosta]

#683 should use nio lib

[guwirth]

@Bertk why did you close this? I still found some places where org.apache.commons.io.FileUtils is in use?

https://github.com/SonarOpenCommunity/sonar-cxx/search?utf8=%E2%9C%93&q=org.apache.commons.io.FileUtils&type=