if (mapping != null) {
                    if (Constants.MAPPING_TYPE_ARRAY.equalsIgnoreCase(mapping.getValue2())) {
                        dataMap.put(mapping.getValue1(), values);
                    } else if (Constants.MAPPING_TYPE_STRING.equalsIgnoreCase(mapping.getValue2())) {
                        final String joinedValue = StringUtils.join(values, ' ');

            if (boostList != null) {
                boostList.forEach(pair -> list.add(new FilterFunctionBuilder(pair.getValue2(), pair.getValue3())));
            }
        });
    }

    /**
     * Retrieves a list of boosted documents for the specified KeyMatch.
     *
     * @param keyMatch The KeyMatch instance.

            for (final Tuple3<String, String, String> host : vHosts) {
                final String headerValue = req.getHeader(host.getValue1());
                if (host.getValue2().equalsIgnoreCase(headerValue)) {
                    return func.apply(host.getValue3());
                }
            }
            return defaultValue;
        }).orElse(defaultValue);
    }

    /**

     */
    public String getValue() {
        return value;
    }

    /**
     * Sets the value of the request header.
     * @param value The value of the request header.
     */
    public void setValue(final String value) {
        this.value = value;
    }

    /**
     * Checks if the request header is valid.
     * A header is considered valid if its name is not blank and its value is not null.

        for (final LabelType labelType : labelTypeList) {
            final LabelTypeItem item = new LabelTypeItem();
            item.setLabel(labelType.getName());
            item.setValue(labelType.getValue());
            item.setPermissions(labelType.getPermissions());
            item.setVirtualHost(labelType.getVirtualHost());
            item.setLocale(labelType.getLocale());

     *
     * @param index
     *            the index
     * @param value
     *            the value
     */
    public void setAt(final int index, final V value) {
        getEntryAt(index).setValue(value);
    }

    @Override
    public V remove(final Object key) {
        final Entry<K, V> e = removeMap(key);
        if (e != null) {
            final V value = e.value;

        }
        final Iterator entries = map.entrySet().iterator();
        while (entries.hasNext()) {
            final Map.Entry entry = (Map.Entry) entries.next();
            entry.setValue(Collections.unmodifiableList((List) entry.getValue()));
        }
        return headerFields = Collections.unmodifiableMap(map);
    }

    @Override
    public Map getHeaderFields() {

                "key");
        setupEpg(_epgMap, et -> ((CrawlingInfoParam) et).getValue(), (et, vl) -> ((CrawlingInfoParam) et).setValue(DfTypeUtil.toString(vl)),
                "value");
    }

    @Override
    public PropertyGateway findPropertyGateway(final String prop) {
        return doFindEpg(_epgMap, prop);
    }

                "updatedTime");
        setupEpg(_epgMap, et -> ((LabelType) et).getValue(), (et, vl) -> ((LabelType) et).setValue(DfTypeUtil.toString(vl)), "value");
        setupEpg(_epgMap, et -> ((LabelType) et).getVirtualHost(), (et, vl) -> ((LabelType) et).setVirtualHost(DfTypeUtil.toString(vl)),
                "virtualHost");
    }

                (et, vl) -> ((RequestHeader) et).setUpdatedTime(DfTypeUtil.toLong(vl)), "updatedTime");
        setupEpg(_epgMap, et -> ((RequestHeader) et).getValue(), (et, vl) -> ((RequestHeader) et).setValue(DfTypeUtil.toString(vl)),
                "value");
        setupEpg(_epgMap, et -> ((RequestHeader) et).getWebConfigId(),
                (et, vl) -> ((RequestHeader) et).setWebConfigId(DfTypeUtil.toString(vl)), "webConfigId");