public boolean isEmpty() {
    return annotations.isEmpty() && baseClasses.isEmpty();
  }
Configuration indicating which specs and methods should be
included/excluded from a spec run. Specs can be included/excluded
based on their annotations and their (base) classes. Methods
can be included/excluded based on their annotations.

@author Peter Niederwieser
spock-core/src/main/java/spock/config/IncludeExcludeCriteria.java