* Provides common functionality for processing and executing search queries.
 */
public abstract class QueryCommand {

    /**
     * Default constructor for QueryCommand.
     * Creates a new instance of the query command with default settings.
     */
    public QueryCommand() {
        // Default constructor
    }

    /**
     * Executes the query command and returns a QueryBuilder.

     * @param queryCommand the query command implementation to add
     * @throws IllegalArgumentException if name or queryCommand is null
     */
    public void add(final String name, final QueryCommand queryCommand) {
        if (name == null || queryCommand == null) {
            throw new IllegalArgumentException(

        assertEquals("TEST123", queryCommand.toLowercaseWildcard("TEST123"));
        assertEquals("", queryCommand.toLowercaseWildcard(""));
    }

    @Test
    public void test_toLowercaseWildcard_mixedCase() {
        queryCommand.setLowercaseWildcard(true);

        assertEquals("testcase", queryCommand.toLowercaseWildcard("TestCase"));

        assertTrue(queryCommand.isSearchField("title"));
        assertTrue(queryCommand.isSearchField("content"));
        assertTrue(queryCommand.isSearchField("url"));
        assertTrue(queryCommand.isSearchField("host"));
        assertTrue(queryCommand.isSearchField("filetype"));

        // Test invalid search fields
        assertFalse(queryCommand.isSearchField("invalid"));
        assertFalse(queryCommand.isSearchField("unknown"));

    private PhraseQueryCommand queryCommand;

    @Override
    protected void setUpChild() throws Exception {
        // Initialize and register PhraseQueryCommand
        queryCommand = new PhraseQueryCommand();
        queryCommand.register();
    }

    @Test
    public void test_getQueryClassName() {
        assertEquals("PhraseQuery", queryCommand.getQueryClassName());
    }

    @Test

    private TermRangeQueryCommand queryCommand;

    @Override
    protected void setUpChild() throws Exception {
        // Initialize and register TermRangeQueryCommand
        queryCommand = new TermRangeQueryCommand();
        queryCommand.register();
    }

    @Test
    public void test_getQueryClassName() {
        assertEquals("TermRangeQuery", queryCommand.getQueryClassName());
    }

    @Test

 * Command class for handling term range query execution and conversion.
 * This class processes Lucene TermRangeQuery objects and converts them to OpenSearch QueryBuilder instances.
 */
public class TermRangeQueryCommand extends QueryCommand {
    private static final Logger logger = LogManager.getLogger(TermRangeQueryCommand.class);

    /**
     * Default constructor for TermRangeQueryCommand.
     */
    public TermRangeQueryCommand() {

import org.opensearch.index.query.PrefixQueryBuilder;
import org.opensearch.index.query.QueryBuilder;

public class QueryCommandTest extends UnitFessTestCase {
    private QueryCommand queryCommand;

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {
        super.setUp(testInfo);

        // Setup FessConfig with proper initialization

    public void test_toLowercaseWildcard_enabled() {
        queryCommand.setLowercaseWildcard(true);

        assertEquals("test", queryCommand.toLowercaseWildcard("TEST"));
        assertEquals("hello", queryCommand.toLowercaseWildcard("Hello"));
        assertEquals("mixed123", queryCommand.toLowercaseWildcard("MiXeD123"));
        assertEquals("already_lower", queryCommand.toLowercaseWildcard("already_lower"));
    }

    @Test

import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;

/**
 * Query command for match all documents query.
 */
public class MatchAllQueryCommand extends QueryCommand {

    /**
     * Default constructor.
     */
    public MatchAllQueryCommand() {
        super();
    }

    private static final Logger logger = LogManager.getLogger(MatchAllQueryCommand.class);