private File cachedLocation;

    protected AbstractLocator(ExecActionFactory execActionFactory) {
        this.execActionFactory = execActionFactory;
    }

    protected abstract List<String> getXcrunFlags();

    public File find() {
        synchronized (this) {
            if (cachedLocation == null) {
                ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

    @Inject
    public MacOSSdkPlatformPathLocator(ExecActionFactory execActionFactory) {
        super(execActionFactory);
    }

    @Override
    protected List<String> getXcrunFlags() {
        return ImmutableList.of("--show-sdk-platform-path");
    }

    @Inject
    public MacOSSdkPathLocator(ExecActionFactory execActionFactory) {
        super(execActionFactory);
    }

    @Override
    protected List<String> getXcrunFlags() {
        return ImmutableList.of("--show-sdk-path");
    }

    @Inject
    public SwiftStdlibToolLocator(ExecActionFactory execActionFactory) {
        super(execActionFactory);
    }

    @Override
    protected List<String> getXcrunFlags() {
        return ImmutableList.of("--find", "swift-stdlib-tool");
    }