}

    @Override
    public int size() {
      assertTrue(Thread.holdsLock(mutex));
      return super.size();
    }

    @Override
    public boolean isEmpty() {
      assertTrue(Thread.holdsLock(mutex));
      return super.isEmpty();
    }

    @Override
    public @Nullable V remove(Object object) {
      assertTrue(Thread.holdsLock(mutex));
      return super.remove(object);
    }

        }
        if (packaging != null) {
            xml.append("    <packaging>").append(packaging).append("</packaging>\n");
        }

        if (!properties.isEmpty()) {
            xml.append("    <properties>\n");
            for (Property property : properties) {
                xml.append("        <")
                        .append(property.name)

            String msg = "Cannot register null or empty aggregation: name=" + name + " value=" + value;
            throw new InvalidQueryRegisteredException(msg);
        }
    }

    protected void checkEsInvalidAggregationCollection(String name, Collection<?> values) {
        if (values == null || values.isEmpty()) {

            this.modelInterpolator = modelInterpolator;
            this.logger = logger;
        }

        @Override
        public ModelInterpolationException run() {
            while (!interpolationTargets.isEmpty()) {
                Object obj = interpolationTargets.removeFirst();

                try {
                    traverseObjectWithParents(obj.getClass(), obj);
                } catch (ModelInterpolationException e) {

    }

    /**
     *
     */
    @Test
    public void testIsEmpty() {
        assertTrue(ArrayUtil.isEmpty((Object[]) null));
        assertTrue(ArrayUtil.isEmpty(new Object[] {}));
        assertFalse(ArrayUtil.isEmpty(new Object[] { "" }));
        assertFalse(ArrayUtil.isEmpty(new Object[] { "aaa" }));
    }

    /**
     * @throws Exception
     */
    @Test

      public boolean contains(@Nullable Object element) {
        return multiset1.contains(element) || multiset2.contains(element);
      }

      @Override
      public boolean isEmpty() {
        return multiset1.isEmpty() && multiset2.isEmpty();
      }

      @Override
      public int count(@Nullable Object element) {
        return max(multiset1.count(element), multiset2.count(element));
      }

                    String[] args = lines.filter(arg -> !arg.isEmpty() && !arg.startsWith("#"))
                            .toArray(String[]::new);
                    mavenConfig = cliManager.parse(args);
                    List<?> unrecognized = mavenConfig.getArgList();
                    if (!unrecognized.isEmpty()) {
                        // This file can only contain options, not args (goals or phases)

    }

    private static boolean isEmpty(Object value) {
      // Put types estimated to be the most frequent first.
      if (value instanceof CharSequence) {
        return ((CharSequence) value).length() == 0;
      } else if (value instanceof Collection) {
        return ((Collection<?>) value).isEmpty();
      } else if (value instanceof Map) {
        return ((Map<?, ?>) value).isEmpty();

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {
            LinkedHashMap<String, Plugin> mergedPlugins = new LinkedHashMap<>();
            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));

     */
    public static String decodePath(final String id) {
        final PathInfo pi = convertToItem(id);
        if (StringUtil.isEmpty(pi.getPath()) && StringUtil.isEmpty(pi.getName())) {
            return StringUtil.EMPTY;
        }
        if (StringUtil.isEmpty(pi.getPath())) {
            return pi.getName();
        }
        return pi.getPath() + "/" + pi.getName();
    }

    /**