/**
 * Gets the compiled(&compressed) CSS
 *
 * @param file     the path to a .scss file. File should end with .css or .min.css (The compiler will look for the
 *                 .scss file, then compiles and decides to minify or not).
 * @param importer a additional list of importers
 * @return Optional with the compiled css as string. Empty optional if the fileName is not valid.
 * @throws CompilationException if {@link Compiler#compile(FileContext)} throws
 */
public synchronized Optional<String> getCSSFile(String file, List<Importer> importer)
    throws CompilationException, IOException {
    if (!isDeveloperMode() && fileCompiledContentMap.containsKey(file)) {
        return Optional.of(fileCompiledContentMap.get(file));
    } else {
        return Optional.ofNullable(compile(file, importer));
    }
}
 

/**
 *
 * @param scopeClass
 *            The scope class used with SassResourceReference.
 * @param delegate
 *            The importer that actually imports Sass sources.
 */
public TrackingImporter(String scopeClass, Importer delegate)
{
    this.scopeClass = scopeClass;
    this.delegate = delegate;
    this.importedSources = new ArrayList<>();
}