* @param initializer the initializer consumer for the component
     * @param destroyer the destroyer consumer for the component
     * @return this container instance for method chaining
     */
    public <T> StandardCrawlerContainer singleton(final String name, final Class<T> cls, final Consumer<T> initializer,
            final Consumer<T> destroyer) {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.service.impl;

import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

import org.apache.lucene.search.TotalHits;
import org.codelibs.core.beans.util.BeanUtil;
import org.codelibs.fess.crawler.entity.OpenSearchAccessResult;
import org.codelibs.fess.crawler.entity.OpenSearchAccessResultData;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Base64;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import java.util.function.Consumer;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.search.TotalHits;
import org.codelibs.core.beans.BeanDesc;
import org.codelibs.core.beans.Converter;

     * @param credentials The credentials.
     * @param executor The executor for HTTP requests.
     */
    public void authenticate(final Credentials credentials,
            final BiConsumer<HttpUriRequest, BiConsumer<HttpResponse, HttpEntity>> executor) {
        final String tokenUrl = getParameter(TOKEN_URL);
        final String tokenPattern = getParameter(TOKEN_PATTERN);

import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiConsumer;
import java.util.stream.Collectors;

import org.apache.commons.io.output.DeferredFileOutputStream;
import org.apache.commons.lang3.SystemUtils;
import org.apache.logging.log4j.LogManager;

    }

    /**
     * Extracts keywords from the given query string based on the specified fields.
     *
     * @param q the query string to parse and extract keywords from
     * @param fields the fields to consider when extracting keywords
     * @return a list of unique keywords extracted from the query string
     */
    public static List<String> getKeywords(final String q, final String[] fields) {