Method testCons

core/src/test/java/org/apache/calcite/util/UtilTest.java:476–525

()

  }

  @Test void testCons() {
    final List<String> abc0 = Arrays.asList("a", "b", "c");

    final List<String> abc = ConsList.of("a", ImmutableList.of("b", "c"));
    assertThat(abc, hasSize(3));
    assertThat(abc, is(abc0));

    final List<String> bc = Lists.newArrayList("b", "c");
    final List<String> abc2 = ConsList.of("a", bc);
    assertThat(abc2, hasSize(3));
    assertThat(abc2, is(abc0));
    bc.set(0, "z");
    assertThat(abc2, is(abc0));

    final List<String> bc3 = ConsList.of("b", Collections.singletonList("c"));
    final List<String> abc3 = ConsList.of("a", bc3);
    assertThat(abc3, hasSize(3));
    assertThat(abc3, is(abc0));
    assertThat(abc3.indexOf("b"), is(1));
    assertThat(abc3.indexOf("z"), is(-1));
    assertThat(abc3.lastIndexOf("b"), is(1));
    assertThat(abc3.lastIndexOf("z"), is(-1));
    assertThat(abc3.hashCode(), is(abc0.hashCode()));

    assertThat(abc3.get(0), is("a"));
    assertThat(abc3.get(1), is("b"));
    assertThat(abc3.get(2), is("c"));
    try {
      final String z = abc3.get(3);
      fail("expected error, got " + z);
    } catch (IndexOutOfBoundsException e) {
      // ok
    }
    try {
      final String z = abc3.get(-3);
      fail("expected error, got " + z);
    } catch (IndexOutOfBoundsException e) {
      // ok
    }
    try {
      final String z = abc3.get(30);
      fail("expected error, got " + z);
    } catch (IndexOutOfBoundsException e) {
      // ok
    }

    final List<String> a = ConsList.of("a", ImmutableList.of());
    assertThat(a, hasSize(1));
    assertThat(a, isListOf("a"));
  }

  @Test void testConsPerformance() {
    final int n = 2000000;