sclass JavaCompilation {
  File srcDir;
  L<File> libraries;
  File classesDir;
  bool verbose = true;
  
  L<File> sources;
  File optionsFile;
  S compilerOutput;
  
  swappable void invokeJavaCompiler() {
    compilerOutput = invokeEcj_direct(optionsFile);
  }
  
  run {
    // collect sources

    sources = findJavaSourceFiles(srcDir);
    if (sources.isEmpty())
      throw new IOException("No sources found");

    // compile

    optionsFile = File.createTempFile("ecj", "", javaxTempDir());
    try {
      if (verbose) print("Compiling " + sources.size() + " source(s) to " + classesDir.getPath());
      if (verbose) print("Libraries: " + libraries);
      
      S options = "-d " + pqO(classesDir.getPath());
      libraries.add(pathToJavaxJar());
      writeOptions(sources, libraries, optionsFile, options);
      classesDir.mkdirs();
      invokeJavaCompiler();
    } finally {
      optionsFile.delete();
    }
  }
}