* or method references instead of classes, leaving your code easier to migrate in the future.
 *
 * <p>The {@link Predicates} class provides common predicates and related utilities.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/FunctionalExplained">the use of {@code Predicate}</a>.
 *
 * @author Kevin Bourrillion
 * @since 2.0
 */

import jakarta.servlet.http.HttpSession;

/**
 * Abstract base class for search-related actions in the Fess search application.
 * Provides common functionality for search operations, including search form handling,
 * label management, user authentication, and search result processing.
 *
 * This class extends FessBaseAction and serves as the foundation for all search-related
 * web actions in the application.
 */

    }

    public void test_getRelatedQueries_nullQuery() {
        List<RelatedQuery> testData = new ArrayList<>();
        testData.add(createRelatedQuery("test", new String[] { "related" }, ""));
        mockBhv.setTestData(testData);

        relatedQueryHelper.load();

        String[] results = relatedQueryHelper.getRelatedQueries(null);
        assertEquals(0, results.length);
    }

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.exception;

/**
 * Exception for plugin-related errors.
 */
public class PluginException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    /**
     * Creates a plugin exception with message and cause.
     *

import java.text.DecimalFormatSymbols;
import java.util.Locale;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.text.DecimalFormatSymbolsUtil;

/**
 * Utility class for conversions related to {@link Number}.
 *
 * @author higa
 */
public abstract class NumberConversionUtil {

    /**
     * Do not instantiate.
     */
    protected NumberConversionUtil() {
    }

    /**

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.exception;

/**
 * Exception thrown when theme-related operations fail.
 * This exception is used for errors during theme installation, uninstallation, or configuration.
 */
public class ThemeException extends FessSystemException {

 *
 * This exception is typically thrown when query parsing, serialization,
 * or processing fails during search operations. It extends FessSystemException
 * to provide specific handling for search query-related errors.
 */
public class SearchQueryException extends FessSystemException {

    /** Serial version UID for serialization. */
    private static final long serialVersionUID = 1L;

    /**

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.curl;

/**
 * Custom exception class for handling errors related to Curl operations.
 * This class extends {@link RuntimeException} and provides constructors
 * to create an exception instance with a message and an optional cause.
 *
 * <p>Usage examples:</p>
 * <pre>

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.util;

import org.codelibs.fess.Constants;

/**
 * This class provides system-related utility methods.
 * It extends {@link org.codelibs.core.lang.SystemUtil} and adds
 * methods specific to the Fess application.
 */
public class SystemUtil extends org.codelibs.core.lang.SystemUtil {
    /**

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.convert;

import java.math.BigInteger;

/**
 * Utility class for conversions related to {@link BigInteger}.
 *
 * @author higa
 */
public abstract class BigIntegerConversionUtil {

    /**
     * Do not instantiate.
     */
    protected BigIntegerConversionUtil() {
    }

    /**