* currentEntry (which we never subsequently clear).
       */
      int frequency = requireNonNull(currentEntry).getValue().get();
      if (frequency <= 0) {
        throw new ConcurrentModificationException();
      }
      if (currentEntry.getValue().addAndGet(-1) == 0) {
        entryIterator.remove();
      }
      size--;
      canRemove = false;
    }
  }

  @Override

    }

    @Override
    public V getValue() {
      return value;
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      // Cannot use key and value equivalence
      if (object instanceof Entry) {
        Entry<?, ?> that = (Entry<?, ?>) object;
        return key.equals(that.getKey()) && value.equals(that.getValue());
      }
      return false;
    }

        return context.getValue(expression) != null;
    }

    public Object getValue(String expression) {
        try {
            return context.getValue(expression);
        } catch (JXPathNotFoundException e) {
            return null;
        }
    }

    public boolean xPathExpressionEqualsValue(String expression, String value) {
        return context.getValue(expression) != null

      V oldValue = forwardDelegate.putIfAbsent(e.getKey(), e.getValue());
      if (oldValue != null) {
        throw conflictException("key", e.getKey() + "=" + oldValue, entryArray[i]);
      }
      K oldKey = backwardDelegate.putIfAbsent(e.getValue(), e.getKey());
      if (oldKey != null) {
        throw conflictException("value", oldKey + "=" + e.getValue(), entryArray[i]);
      }
    }

                    if (e.getValue() instanceof String[]) {
                        final String[] values = (String[]) e.getValue();
                        for (final String v : values) {
                            result.getSearchFieldLogList().add(new Pair<>(e.getKey(), v));
                        }
                    } else if (e.getValue() instanceof List) {

                configConfigMap.put(key.substring(CONFIG_PREFIX.length()), entry.getValue());
            } else if (key.startsWith(CLIENT_PREFIX)) {
                clientConfigMap.put(key.substring(CLIENT_PREFIX.length()), entry.getValue());
            } else if (key.startsWith(XPATH_PREFIX)) {
                xpathConfigMap.put(key.substring(XPATH_PREFIX.length()), entry.getValue());
            } else if (key.startsWith(META_PREFIX)) {

        String title = DocumentUtil.getValue(document, fessConfig.getIndexFieldTitle(), String.class);
        if (StringUtil.isBlank(title)) {
            title = DocumentUtil.getValue(document, fessConfig.getIndexFieldFilename(), String.class);
            if (StringUtil.isBlank(title)) {
                title = DocumentUtil.getValue(document, fessConfig.getIndexFieldUrl(), String.class);
            }

      Entry<K, Collection<V>> entry = entryIterator.next();
      K key = entry.getKey();
      Collection<V> collection = filterCollection(entry.getValue(), new ValuePredicate(key));
      if (!collection.isEmpty() && predicate.apply(Maps.immutableEntry(key, collection))) {
        if (collection.size() == entry.getValue().size()) {
          entryIterator.remove();
        } else {
          collection.clear();
        }
        changed = true;

      this.samples =
          new SampleElements<>(
              mapSamples.e0().getValue(),
              mapSamples.e1().getValue(),
              mapSamples.e2().getValue(),
              mapSamples.e3().getValue(),
              mapSamples.e4().getValue());
    }

    @Override
    public SampleElements<V> samples() {
      return samples;
    }

    @Override

  }

  protected final V v0() {
    return e0().getValue();
  }

  protected final K k1() {
    return e1().getKey();
  }

  protected final V v1() {
    return e1().getValue();
  }

  protected final K k2() {
    return e2().getKey();
  }

  protected final V v2() {
    return e2().getValue();
  }

  protected final K k3() {
    return e3().getKey();