return list != null ? Collections.unmodifiableList(list) : Collections.emptyList();
    }

    private static Map<String, String> unmodifiable(Map<String, String> map) {
        return map != null ? Collections.unmodifiableMap(map) : Collections.emptyMap();
    }

    private static Map<String, String> toMap(Properties properties) {
        if (properties != null && !properties.isEmpty()) {

   * RowSortedTable subinterface with the revised methods?
   */

  StandardRowSortedTable(
      SortedMap<R, Map<C, V>> backingMap, Supplier<? extends Map<C, V>> factory) {
    super(backingMap, factory);
  }

  private SortedMap<R, Map<C, V>> sortedBackingMap() {
    return (SortedMap<R, Map<C, V>>) backingMap;
  }

  /**
   * {@inheritDoc}
   *

        list.add(newArtifact("c"));
        list.add(newArtifact("e"));
        list.add(newArtifact("d"));

        Map<String, Artifact> map = ArtifactUtils.artifactMapByVersionlessId(list);
        assertNotNull(map);
        assertEquals(list, new ArrayList<>(map.values()));
    }

     * {@link org.codelibs.core.collection.CollectionsUtil#isEmpty(java.util.Map)}
     * .
     */
    @Test
    public void testIsEmptyMapOfQQ() {
        HashMap<String, String> map = null;
        assertThat(CollectionsUtil.isEmpty(map), is(true));
        map = new HashMap<String, String>();
        assertThat(CollectionsUtil.isEmpty(map), is(true));
    }

    /**
     * Test method for

    }

    public void putAll(final Map<String, String> map) {
        params.putAll(map);
    }

    public boolean containsKey(final String key) {
        return params.containsKey(key);
    }

    public Map<String, Object> asMap() {
        return new ParamMap<>(new HashMap<>(getDataMap(params)));
    }

    protected static Map<String, Object> getDataMap(final Map<String, Object> params) {

   * putAll()}.
   *
   * @return a map view from each row key to a secondary map from column keys to values
   */
  Map<R, Map<C, V>> rowMap();

  /**
   * Returns a view that associates each column key with the corresponding map from row keys to
   * values. Changes to the returned map will update this table. The returned map does not support

        /**
         * @param param
         * @return 戻り値
         */
        @SuppressWarnings("rawtypes")
        Map rawMap(Map param);

        /**
         * @param param
         * @return 戻り値
         */
        Map<String, Class<?>> genericMap(Map<Integer, String> param);

    }

            val scenarioObj = it as JSONObject
            val testId = scenarioObj["testId"] as String
            val groups = (scenarioObj["groups"] as JSONArray).map {
                val groupObj = it as JSONObject
                val testProject = groupObj["testProject"] as String
                val coverage = (groupObj["coverage"] as JSONObject).map { entry ->

    public void storeQueryId(final String queryId, final List<Map<String, Object>> documentItems) {
        LaRequestUtil.getOptionalRequest().map(req -> req.getSession(false)).ifPresent(session -> {
            final FessConfig fessConfig = ComponentUtil.getFessConfig();

            final List<String> docIdList = new ArrayList<>();
            for (final Map<String, Object> map : documentItems) {

  static <K extends @Nullable Object, V extends @Nullable Object> void writeMap(
      Map<K, V> map, ObjectOutputStream stream) throws IOException {
    stream.writeInt(map.size());
    for (Map.Entry<K, V> entry : map.entrySet()) {
      stream.writeObject(entry.getKey());
      stream.writeObject(entry.getValue());
    }
  }

  /**
   * Populates a map by reading an input stream, as part of deserialization. See {@link #writeMap}