* that this file should be compiled with the additional flag {@code "-foo" }.
 */
public class PBXBuildFile extends PBXProjectItem {
    private final PBXReference fileRef;
    private Optional<NSDictionary> settings;

    public PBXBuildFile(PBXReference fileRef) {
        this.fileRef = Preconditions.checkNotNull(fileRef);
        this.settings = Optional.absent();
    }

 */
public abstract class PBXBuildPhase extends PBXProjectItem {
    private final List<PBXBuildFile> files;

    public PBXBuildPhase() {
        this.files = new ArrayList<>();
    }

    public List<PBXBuildFile> getFiles() {
        return files;
    }

    @Override
    public void serializeInto(XcodeprojSerializer s) {
        super.serializeInto(s);