* @return the previous value associated with key, or null if no mapping existed
     */
    @Override
    public Object put(final String key, final Object value) {
        return parent.put(key, value);
    }

    /**
     * Removes the mapping for a key from this map if it is present.
     *
     * @param key the key whose mapping is to be removed from the map

 * text during indexing and search operations.
 *
 * <p>Each mapping item consists of one or more input character sequences that are mapped to a single output
 * character sequence. The mapping supports both original values and new values for update operations.</p>
 */
public class CharMappingItem extends DictionaryItem {
    /**

          "mapping": {
            "type": "text",
            "analyzer": "empty_analyzer"
          }
        }
      },
      {
        "lang_ca": {
          "match": "*_ca",
          "mapping": {
            "type": "text",
            "analyzer": "catalan_analyzer"
          }
        }
      },
      {
        "lang_ca": {
          "match": "*_ckb-iq",
          "mapping": {

                final Tuple3<String, String, String> mapping = fessConfig.getCrawlerMetadataNameMapping(key);
                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())) {

    /**
     * The processing type for path mapping.
     */
    @Required
    public String processType;

    /**
     * The sort order for this path mapping (0-2147483647).
     */
    @Required
    @Min(value = 0)
    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer sortOrder;

    /**
     * The username who created this path mapping.
     */
    @Size(max = 1000)

 */
public class CharMappingCreator extends DictionaryCreator {
    private static final Logger logger = LogManager.getLogger(CharMappingCreator.class);

    /**
     * Constructs a new CharMappingCreator with the mapping file pattern.
     */
    public CharMappingCreator() {
        super("mapping.*\\.txt");
    }

    /**

/**
 * Helper class for managing file type mappings based on MIME types.
 * This class provides functionality to map MIME types to file types and
 * retrieve appropriate file type classifications for documents during indexing.
 *
 * The mappings are loaded from configuration and can be dynamically modified
 * at runtime. When a MIME type is not found in the mapping, a default value
 * is returned.
 */

        default:
            break;
        }
        return OptionalEntity.empty();
    }

    /**
     * Create a char mapping item.
     * @param form The create form.
     * @param hook The error hook.
     * @return An optional entity of a char mapping item.
     */
    protected OptionalEntity<CharMappingItem> createCharMappingItem(final CreateForm form, final VaErrorHook hook) {
        try {

    }

    @Test
    @DisplayName("Each error code mapping contains exactly two ints")
    void testEachPairLength() {
        for (int i = 0; i < DosError.DOS_ERROR_CODES.length; i++) {
            int[] pair = DosError.DOS_ERROR_CODES[i];
            assertEquals(2, pair.length, String.format("Error mapping at index %d should contain two integers", i));
        }
    }

  }

  public void testMapping_nanX1() {
    assertThrows(
        IllegalArgumentException.class, () -> LinearTransformation.mapping(Double.NaN, 3.4));
  }

  public void testMapping_nanY1() {
    assertThrows(
        IllegalArgumentException.class, () -> LinearTransformation.mapping(1.2, Double.NaN));
  }

  public void testMappingAnd_nanX2() {
    assertThrows(