This project includes mainline build and other utility code. Any library code intended for use by modules should go in frameworks/libs/modules-utils instead.
This project uses a single source path for java code. All java code should go in the java directory with subdirectories corresponding to the java package. Android.bp files should go alongside the java source files, and should only include java source for a single java package to encourage good code hygiene.
Tests for java code should go in the javatests directory and follow the same structure.