code: private SelectorBuilderImpl singleValuePredicate(String field, String propertyValue,
        PredicateOperator operator) {
      Predicate predicate = new Predicate();
      predicate.setField(field);
      predicate.setOperator(operator);
  
      String[] values = new String[1];
      values[0] = propertyValue;
      predicate.setValues(values);
  
      this.predicates.add(predicate);
  
      return this;
    }
docs: Adds a predicate for the specified field, property value, and operator.