* @return the stripe at the specified index
   */
  public abstract L getAt(int index);

  /**
   * Returns the index to which the given key is mapped, so that getAt(indexFor(key)) == get(key).
   */
  abstract int indexFor(Object key);

  /** Returns the total number of stripes in this instance. */
  public abstract int size();

  /**

    assertThat(iia.indexOf(1)).isEqualTo(0);
    assertThat(iia.indexOf(8)).isEqualTo(5);
    assertThat(iia.indexOf(4)).isEqualTo(-1);
    assertThat(ImmutableDoubleArray.of(13).indexOf(13)).isEqualTo(0);
    assertThat(ImmutableDoubleArray.of().indexOf(21)).isEqualTo(-1);
    assertThat(iia.subArray(1, 5).indexOf(1)).isEqualTo(0);
  }

  public void testIndexOf_specialValues() {

    assertThat(Bytes.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Bytes.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);
    assertThat(Bytes.indexOf(ARRAY234, new byte[] {(byte) 2, (byte) 3})).isEqualTo(0);
    assertThat(Bytes.indexOf(ARRAY234, new byte[] {(byte) 3, (byte) 4})).isEqualTo(1);
    assertThat(Bytes.indexOf(ARRAY234, new byte[] {(byte) 3})).isEqualTo(1);

    assertThat(Doubles.indexOf(ARRAY234, EMPTY)).isEqualTo(0);
    assertThat(Doubles.indexOf(EMPTY, ARRAY234)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY234, ARRAY1)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY1, ARRAY234)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Doubles.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);

    assertThat(Chars.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Chars.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);
    assertThat(Chars.indexOf(ARRAY234, new char[] {(char) 2, (char) 3})).isEqualTo(0);
    assertThat(Chars.indexOf(ARRAY234, new char[] {(char) 3, (char) 4})).isEqualTo(1);
    assertThat(Chars.indexOf(ARRAY234, new char[] {(char) 3})).isEqualTo(1);

  }

  public void testIndexOf() {
    assertThat(Ints.indexOf(EMPTY, (int) 1)).isEqualTo(-1);
    assertThat(Ints.indexOf(ARRAY1, (int) 2)).isEqualTo(-1);
    assertThat(Ints.indexOf(ARRAY234, (int) 1)).isEqualTo(-1);
    assertThat(Ints.indexOf(new int[] {(int) -1}, (int) -1)).isEqualTo(0);
    assertThat(Ints.indexOf(ARRAY234, (int) 2)).isEqualTo(0);
    assertThat(Ints.indexOf(ARRAY234, (int) 3)).isEqualTo(1);

    assertThat(Doubles.indexOf(ARRAY234, EMPTY)).isEqualTo(0);
    assertThat(Doubles.indexOf(EMPTY, ARRAY234)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY234, ARRAY1)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY1, ARRAY234)).isEqualTo(-1);
    assertThat(Doubles.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Doubles.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);

    assertThat(Floats.indexOf(ARRAY234, EMPTY)).isEqualTo(0);
    assertThat(Floats.indexOf(EMPTY, ARRAY234)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY234, ARRAY1)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY1, ARRAY234)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Floats.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);
    assertThat(Floats.indexOf(ARRAY234, new float[] {2.0f, 3.0f})).isEqualTo(0);

    assertThat(Floats.indexOf(ARRAY234, EMPTY)).isEqualTo(0);
    assertThat(Floats.indexOf(EMPTY, ARRAY234)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY234, ARRAY1)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY1, ARRAY234)).isEqualTo(-1);
    assertThat(Floats.indexOf(ARRAY1, ARRAY1)).isEqualTo(0);
    assertThat(Floats.indexOf(ARRAY234, ARRAY234)).isEqualTo(0);
    assertThat(Floats.indexOf(ARRAY234, new float[] {2.0f, 3.0f})).isEqualTo(0);

            suggester.indexer().addBadWord(word, apply);
        }
        refresh();
    }

    /**
     * Adds a bad word to the suggest index.
     *
     * @param badWord The bad word to add.
     * @param apply   true to apply the changes immediately.
     */
    public void addBadWord(final String badWord, final boolean apply) {
        suggester.indexer().addBadWord(badWord, apply);