* Provides functionality to retrieve popular words based on search parameters
 * and manages caching for improved performance.
 */
public class PopularWordHelper {
    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(PopularWordHelper.class);

    /** Character used to separate cache key components */
    protected static final char CACHE_KEY_SPLITTER = '\n';

		<property name="encoding">"UTF-8"</property>
	</component>
	<component name="pluginHelper" class="org.codelibs.fess.helper.PluginHelper">
	</component>
	<component name="popularWordHelper" class="org.codelibs.fess.helper.PopularWordHelper">
	</component>
	<component name="queryHelper" class="org.codelibs.fess.helper.QueryHelper">
		<property name="defaultFacetInfo">facetInfo</property>
		<postConstruct name="addQueryRescorer">

    }

    @Test
    public void test_hasPopularWordHelper() {
        assertFalse(ComponentUtil.hasPopularWordHelper());

        ComponentUtil.register(new Object(), "popularWordHelper");
        assertTrue(ComponentUtil.hasPopularWordHelper());
    }

    @Test
    public void test_hasRelatedQueryHelper() {
        assertFalse(ComponentUtil.hasRelatedQueryHelper());