/**
 * Determine the Hibernate database dialect class for the given target database.
 * @param database the target database
 * @return the Hibernate database dialect class, or {@code null} if none found
 */
@Nullable
protected Class<?> determineDatabaseDialectClass(Database database) {
	switch (database) {
		case DB2: return DB2Dialect.class;
		case DERBY: return DerbyTenSevenDialect.class;
		case H2: return H2Dialect.class;
		case HANA: return HANAColumnStoreDialect.class;
		case HSQL: return HSQLDialect.class;
		case INFORMIX: return InformixDialect.class;
		case MYSQL: return MySQL5Dialect.class;
		case ORACLE: return Oracle12cDialect.class;
		case POSTGRESQL: return PostgreSQL95Dialect.class;
		case SQL_SERVER: return SQLServer2012Dialect.class;
		case SYBASE: return SybaseDialect.class;
		default: return null;
	}
}
 

/**
 * Determine the Hibernate database dialect class for the given target database.
 * @param database the target database
 * @return the Hibernate database dialect class, or {@code null} if none found
 */
@Nullable
protected Class<?> determineDatabaseDialectClass(Database database) {
	switch (database) {
		case DB2: return DB2Dialect.class;
		case DERBY: return DerbyTenSevenDialect.class;
		case H2: return H2Dialect.class;
		case HANA: return HANAColumnStoreDialect.class;
		case HSQL: return HSQLDialect.class;
		case INFORMIX: return InformixDialect.class;
		case MYSQL: return MySQL5Dialect.class;
		case ORACLE: return Oracle12cDialect.class;
		case POSTGRESQL: return PostgreSQL95Dialect.class;
		case SQL_SERVER: return SQLServer2012Dialect.class;
		case SYBASE: return SybaseDialect.class;
		default: return null;
	}
}
 

public static Optional<String> guessDialect(Optional<String> dbKind) {
    // For now select the latest dialect from the driver
    // later, we can keep doing that but also avoid DCE
    // of all the dialects we want in so that people can override them
    String resolvedDbKind = dbKind.orElse("NO_DATABASE_KIND");
    if (DatabaseKind.isDB2(resolvedDbKind)) {
        return Optional.of(DB297Dialect.class.getName());
    }
    if (DatabaseKind.isPostgreSQL(resolvedDbKind)) {
        return Optional.of(QuarkusPostgreSQL10Dialect.class.getName());
    }
    if (DatabaseKind.isH2(resolvedDbKind)) {
        return Optional.of(QuarkusH2Dialect.class.getName());
    }
    if (DatabaseKind.isMariaDB(resolvedDbKind)) {
        return Optional.of(MariaDB103Dialect.class.getName());
    }
    if (DatabaseKind.isMySQL(resolvedDbKind)) {
        return Optional.of(MySQL8Dialect.class.getName());
    }
    if (DatabaseKind.isDerby(resolvedDbKind)) {
        return Optional.of(DerbyTenSevenDialect.class.getName());
    }
    if (DatabaseKind.isMsSQL(resolvedDbKind)) {
        return Optional.of(SQLServer2012Dialect.class.getName());
    }

    String error = dbKind.isPresent()
            ? "Hibernate extension could not guess the dialect from the database kind '" + resolvedDbKind
                    + "'. Add an explicit '" + HIBERNATE_ORM_CONFIG_PREFIX + "dialect' property."
            : "Hibernate extension cannot guess the dialect as no database kind is specified by 'quarkus.datasource.db-kind'";
    throw new ConfigurationError(error);
}