wro4j-maven-plugin/src/main/java/ro/isdc/wro/maven/plugin/AbstractWro4jMojo.java
private void persistResourceFingerprints(final List<String> groupNames) {
    final WroModelInspector modelInspector = new WroModelInspector(getModel());
    for (final String groupName : groupNames) {
      final Group group = modelInspector.getGroupByName(groupName);
      if (group != null) {
        for (final Resource resource : group.getResources()) {
          getResourceChangeHandler().remember(resource);
        }
      }
    }
  }
private void persistResourceFingerprints(final List<String> groupNames) {
    final WroModelInspector modelInspector = new WroModelInspector(getModel());
    for (final String groupName : groupNames) {
      final Group group = modelInspector.getGroupByName(groupName);
      if (group != null) {
        for (final Resource resource : group.getResources()) {
          getResourceChangeHandler().remember(resource);
        }
      }
    }
  }
Store digest for all resources contained inside the list of provided groups.