public class SourceFoldersCreator {

    public List<SourceFolder> createSourceFolders(final EclipseClasspath classpath) {

        List<SourceFolder> sourceFolders = configureProjectRelativeFolders(classpath.getSourceSets(),
            classpath.getTestSourceSets().getOrElse(emptySet()),
            input-> classpath.getProject().relativePath(input),
            classpath.getDefaultOutputDir(),

        _ * resources.srcDirTrees >> [resourcesTree]
        _ * allSource.getSrcDirTrees() >> [javaTree, resourcesTree]
        return new SourceFoldersCreator().configureProjectRelativeFolders([sourceSet], [], { File file -> file.path },
            defaultOutputFolder, baseSourceOutputFolder.absolutePath)
    }

    private List<SourceFolder> externalSourceFolders(String... paths) {