The plugin is used to reformat the source code at build time. It repackages the net.revelc.code.formatter:formatter-maven-plugin, adding a way to exclude portions of the source file from being formatted. This is useful to avoid reformating inside the DSL which is usually indented with semantics.
The only modified file is the JavaFormatter class. The two other FormatterMojo and ValidateMojo classes are provided so that the maven plugin plugin can easily detect the goals.