Class ChangeDetector

app/src/processing/app/ui/ChangeDetector.java:44–285

public class ChangeDetector implements WindowFocusListener {
  private final Sketch sketch;
  private final Editor editor;

  private List<SketchCode> ignoredRemovals = new ArrayList<>();
  private List<SketchCode> ignoredModifications = new ArrayList<>();

  // Windows and others seem to have a few hundred ms difference in reported
  // times, so we're arbitrarily setting a gap in time here.
  // Mac OS X has an (exactly) one second difference. Not sure if it's a Java
  // bug or something else about how OS X is writing files.
  static private final int MODIFICATION_WINDOW_MILLIS =
    Preferences.getInteger("editor.watcher.window");

  // Debugging this feature is particularly difficult, adding an option for it
  static private final boolean DEBUG =
    Preferences.getBoolean("editor.watcher.debug");


  public ChangeDetector(Editor editor) {
    this.sketch = editor.sketch;
    this.editor = editor;
  }


  @Override
  public void windowGainedFocus(WindowEvent e) {
    if (Preferences.getBoolean("editor.watcher")) {
      if (sketch != null) {
        // make sure the sketch folder exists at all.
        // if it does not, it will be re-saved, and no changes will be detected
        sketch.ensureExistence();

        checkFiles();
      }
    }
  }


  @Override
  public void windowLostFocus(WindowEvent e) {
    // Shouldn't need to do anything here, and not storing anything here b/c we
    // don't want to assume a loss of focus is required before change detection
  }


  private void checkFiles() {
    List<String> filenames = new ArrayList<>();
    List<String> extensions = new ArrayList<>();
    sketch.getSketchCodeFiles(filenames, extensions);

    SketchCode[] codes = sketch.getCode();

    // Separate codes with and without files
    Map<Boolean, List<SketchCode>> existsMap = Arrays.stream(codes)
        .collect(Collectors.groupingBy(code -> filenames.contains(code.getFileName())));