assertNull(Strings.emptyToNull(""));
    assertEquals("a", Strings.emptyToNull("a"));
  }

  public void testIsNullOrEmpty() {
    assertTrue(Strings.isNullOrEmpty(null));
    assertTrue(Strings.isNullOrEmpty(""));
    assertFalse(Strings.isNullOrEmpty("a"));
  }

  public void testPadStart_noPadding() {
    assertSame("", Strings.padStart("", 0, '-'));
    assertSame("x", Strings.padStart("x", 0, '-'));

         * args = new HashMap<>(); args.put("mode", "normal"); args.put("discardPunctuation", "false"); if
         * (Strings.isNullOrEmpty(path)) { args.put("userDictionary", path); } if (Strings.isNullOrEmpty(encoding)) {
         * args.put("userDictionaryEncoding", encoding); } final JapaneseTokenizerFactory japaneseTokenizerFactory = new

                deferred.reject(new SuggesterException(e.getMessage(), e));
            }
        });
    }

    private boolean isSingleWordQuery(final String query) {
        return !Strings.isNullOrEmpty(query) && !query.contains(" ") && !query.contains("　");
    }

    /**
     * Builds the query for suggestions.
     * @param q The query string.
     * @param fields The fields to search in.

    }

    /**
     * Get validation error.
     * @param badWord Bad word
     * @return Validation error
     */
    protected String getValidationError(final String badWord) {
        if (Strings.isNullOrEmpty(badWord)) {
            return "badWord was empty.";
        }
        if (badWord.contains(" ") || badWord.contains("  ")) {
            return "badWord contains space.";
        }
        return null;

     */
    public Deferred<T>.Promise execute(final Client client) {
        final String error = getValidationError();
        if (!Strings.isNullOrEmpty(error)) {
            throw new IllegalArgumentException(error);
        }

        final Deferred<T> deferred = new Deferred<>();
        try {
            processRequest(client, deferred);

        assertNotNull(suggester.indexer());
        assertNotNull(suggester.getNormalizer());
        assertNotNull(suggester.getReadingConverter());
        assertNotNull(suggester.settings());
        assertTrue(!Strings.isNullOrEmpty(suggester.index));
    }

    public void test_buildWithParameters() throws Exception {
        final String settingsIndexName = "test-settings-index";
        final String settingsTypeName = "test-settings-type";

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.base.Strings.isNullOrEmpty;
import static com.google.common.collect.Iterables.concat;
import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.truth.Truth.assertThat;
import static java.util.Collections.nCopies;

                    final String term = termTokenList.get(i).getTerm();
                    String reading = readingTokenList.get(i).getTerm();
                    if (Strings.isNullOrEmpty(reading)) {
                        reading = term;
                    }
                    reading = transliterator.transliterate(reading);

                    final int pos = text.indexOf(term, offset);

internal fun <T> immutableListOf(vararg elements: T): List<T> = elements.toImmutableList()

/** Returns an immutable list from copy of this. */
internal fun <T> Array<out T>?.toImmutableList(): List<T> =
  when {
    this.isNullOrEmpty() -> emptyList()
    this.size == 1 -> Collections.singletonList(this[0])
    else -> this.clone().asList().unmodifiable()
  }

/** Closes this, ignoring any checked exceptions. */

   *
   * @param string a string reference to check
   * @return {@code true} if the string is null or is the empty string
   */
  public static boolean isNullOrEmpty(@Nullable String string) {
    return Platform.stringIsNullOrEmpty(string);
  }

  /**
   * Returns a string, of length at least {@code minLength}, consisting of {@code string} prepended