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    /**
     * Hamcrest matcher to check that a selector contains a
     * Criterion with the specified type.
     */
    public static final class CriterionExistsMatcher
           extends TypeSafeMatcher<TrafficSelector> {
        private final Criterion.Type type;
        /**
         * Constructs a matcher for the given criterion type.
         *
         * @param typeValue criterion type to match
         */
        public CriterionExistsMatcher(Criterion.Type typeValue) {
            type = typeValue;
        }
        @Override
        public boolean matchesSafely(TrafficSelector selector) {
            final Set<Criterion> criteria = selector.criteria();
            return notNullValue().matches(criteria) &&
                   hasSize(1).matches(criteria) &&
                   notNullValue().matches(selector.getCriterion(type));
        }
        @Override
        public void describeTo(Description description) {
            description.appendText("a criterion with type \" ").
                    appendText(type.toString()).
                    appendText("\"");
        }
    }

    /**
     * Creates a criterion type matcher.  Returns a matcher
     * for a criterion with the given type.
     *
     * @param type type of Criterion to match
     * @return Matcher object
     */
    @Factory
    public static Matcher<TrafficSelector> hasCriterionWithType(Criterion.Type type) {
        return new CriterionExistsMatcher(type);
    }
 
   /**
     * Tests the builder functions that add specific criteria.
     */
    @Test
    public void testCriteriaCreation() {
        TrafficSelector selector;

        selector = DefaultTrafficSelector.builder()
                .matchInport(PortNumber.portNumber(11)).build();
        assertThat(selector, hasCriterionWithType(Type.IN_PORT));
    }