*
 * @param <K> the key type
 * @param <V> the value type
 */
public class ParamMap<K, V> implements Map<K, V> {

    private final Map<K, V> parent;

    /**
     * Creates a new parameter map.
     *
     * @param parent the parent map
     */
    public ParamMap(final Map<K, V> parent) {
        this.parent = parent;
    }

    /**
     * Gets the parent map.
     *

        assertFalse(paramMap.containsKey("xxx"));
        assertTrue(paramMap.containsKey("aaa"));
        assertTrue(paramMap.containsKey("aaa_bbb"));
        assertTrue(paramMap.containsKey("aaaBbb"));
        assertTrue(paramMap.containsKey("AaaBbb"));
        assertFalse(paramMap.containsKey("aaabbb"));
        assertTrue(paramMap.containsKey("aaa_bbb_ccc"));

        Map<String, String[]> paramMap;

        paramMap = filter.parseQueryString("a=1", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("1", paramMap.get("a")[0]);

        paramMap = filter.parseQueryString("a=1&b=2", "UTF-8");
        assertEquals(2, paramMap.size());
        assertEquals("1", paramMap.get("a")[0]);
        assertEquals("2", paramMap.get("b")[0]);

        storeData(config, callback, paramMap.newInstance(), configScriptMap, defaultDataMap);

    }

    /**
     * Get the script type.
     * @param paramMap The parameters.
     * @return The script type.
     */
    protected String getScriptType(final DataStoreParams paramMap) {
        final String value = paramMap.getAsString(SCRIPT_TYPE);
        if (StringUtil.isBlank(value)) {

        }

        final Map<String, String[]> paramMap = new HashMap<>(paramListMap.size());
        for (final Map.Entry<String, List<String>> entry : paramListMap.entrySet()) {
            final List<String> list = entry.getValue();
            paramMap.put(entry.getKey(), list.toArray(new String[list.size()]));
        }
        return paramMap;
    }

    /**

                            }
                            paramMap.put(key, data);
                        } else {
                            paramMap.put(key, StringUtil.EMPTY);
                        }
                    } else {
                        paramMap.put(line.trim(), StringUtil.EMPTY);
                    }
                }
            }
        }
        return paramMap;
    }

    /**

     * Uses ParamMap for automatic case format conversion between camelCase and snake_case.
     */
    protected final Map<String, Object> params;

    /**
     * Creates a new empty DataStoreParams instance.
     * Initializes the internal parameter map with a ParamMap wrapper.
     */
    public DataStoreParams() {
        params = new ParamMap<>(new HashMap<>());
    }

    /**

     * with parameters from the paramMap substituted into the template.
     *
     * @param template the template string to evaluate
     * @param paramMap the map of parameters to substitute into the template
     * @return the result of evaluating the template, or null if evaluation fails
     */
    Object evaluate(final String template, final Map<String, Object> paramMap);

        return (u, m) -> {
            final Map<String, Object> paramMap = new HashMap<>();
            paramMap.put("url", u);
            paramMap.put("matcher", m);
            final Object value =
                    ComponentUtil.getScriptEngineFactory().getScriptEngine(Constants.DEFAULT_SCRIPT).evaluate(template, paramMap);
            if (value == null) {
                return u;
            }

    /**
     * Stores a document in the search index with the specified parameters and data.
     *
     * @param paramMap the data store parameters containing configuration and metadata
     * @param dataMap the document data to be indexed as key-value pairs
     */
    void store(DataStoreParams paramMap, Map<String, Object> dataMap);

    /**
     * Returns the total number of documents processed by this callback.
     *