* to half-width and to convert any characters to lowercase, ensuring consistency in the output.
 * </p>
 *
 * <p>
 * Example:
 * For the input "キャ", the converter might return a list containing "kya".
 * For the input "ジュ", the converter might return a list containing "zyu", "ju", and "jyu".
 * </p>
 *
 */
public class KatakanaToAlphabetConverter implements ReadingConverter {
    private final Map<String, String[]> convertMap;

     * @param childUrl The child URL to store.
     * @param parentUrl The parent URL.
     * @param weight The weight of the child URL.
     * @param depth The depth of the child URL.
     */
    protected void storeChildUrl(final String childUrl, final String parentUrl, final float weight, final int depth) {
        if (crawlerContext.getMaxDepth() >= 0 && depth > crawlerContext.getMaxDepth()) {
            return;

        assertNotNull(suggestItem);
        assertEquals(word, suggestItem.getText());
        assertEquals(boost, suggestItem.getUserBoost(), 0.001f);
        // The queryFreq and docFreq might be handled differently by SuggestItem
        assertTrue(suggestItem.getQueryFreq() >= 0);
        assertTrue(suggestItem.getDocFreq() >= 0);

        // Check readings

        // Test convert with null text - this might throw exception
        String text = null;
        String field = "content";

        try {
            List<String> results = converter.convert(text, field, "en");
            assertNotNull(results);
        } catch (Exception e) {
            // Expected behavior - null text might cause exception
            assertNotNull(e);
        }
    }

     */
    public void setNormalizer(final Normalizer normalizer) {
        this.normalizer = normalizer;
    }

    /**
     * Sets the prefix match weight.
     * @param prefixMatchWeight The prefix match weight.
     */
    public void setPrefixMatchWeight(final float prefixMatchWeight) {
        this.prefixMatchWeight = prefixMatchWeight;
    }

    /**

    protected List<OpenSearchUrlQueue> fetchUrlQueueList(final String sessionId) {
        return getList(OpenSearchUrlQueue.class, sessionId, null, 0, pollingFetchSize,
                SortBuilders.fieldSort(OpenSearchUrlQueue.WEIGHT).order(SortOrder.DESC),
                SortBuilders.fieldSort(CREATE_TIME).order(SortOrder.ASC));
    }

    /**
     * Saves the session state (currently not implemented).
     *