private static final Splitter COMMA_SPLITTER = Splitter.on(',');

  public void testSplitNullString() {
    try {
      COMMA_SPLITTER.split(null);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testCharacterSimpleSplit() {
    String simple = "a,b,c";
    Iterable<String> letters = COMMA_SPLITTER.split(simple);

  private static final Splitter COMMA_SPLITTER = Splitter.on(',');

  public void testSplitNullString() {
    try {
      COMMA_SPLITTER.split(null);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testCharacterSimpleSplit() {
    String simple = "a,b,c";
    Iterable<String> letters = COMMA_SPLITTER.split(simple);

import java.util.regex.Pattern;

/**
 * Utility class for parsing CSV text
 */
public final class KuromojiCSVUtil {
    private static final char QUOTE = '"';

    private static final char COMMA = ',';

    private static final Pattern QUOTE_REPLACE_PATTERN = Pattern.compile("^\"([^\"]+)\"$");

    private static final String ESCAPED_QUOTE = "\"\"";

    private KuromojiCSVUtil() {
    } // no instance!!!

     */
    String ID_COMBINATION_MODE_ATTRIBUTE = "combine.id";

    /**
     * In case of complex XML structures, combining can be done based on keys.
     * This is a comma separated list of attribute names.
     */
    String KEYS_COMBINATION_MODE_ATTRIBUTE = "combine.keys";

    /**

 *
 * @author Ben Yu
 */
@ElementTypesAreNonnullByDefault
final class Types {

  /** Class#toString without the "class " and "interface " prefixes */
  private static final Joiner COMMA_JOINER = Joiner.on(", ").useForNull("null");

  /** Returns the array type of {@code componentType}. */
  static Type newArrayType(Type componentType) {
    if (componentType instanceof WildcardType) {

     *
     * @since 4.0.0
     */
    private static final String MAVEN_VERSION_FILTERS = "maven.versionFilters";

    /**
     * User property for chained LRM: list of "tail" local repository paths (separated by comma), to be used with
     * {@link ChainedLocalRepositoryManager}.
     * Default value: {@code null}, no chained LRM is used.
     *
     * @since 3.9.0
     */