# Extending OpenAPI { #extending-openapi }

There are some cases where you might need to modify the generated OpenAPI schema.

In this section you will see how.

## The normal process { #the-normal-process }

The normal (default) process, is as follows.

A `FastAPI` application (instance) has an `.openapi()` method that is expected to return the OpenAPI schema.

    protected Map<String, String> queryMap = new LinkedHashMap<>();

    /**
     * Default constructor for FacetQueryView.
     */
    public FacetQueryView() {
        // Default constructor
    }

    /**
     * Initializes the facet query view with default file type queries.
     * This method is called after dependency injection to set up file type facets

 * override {@code addAll} as well, either providing your own implementation, or delegating to the
 * provided {@code standardAddAll} method.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingSet}.
 *

						switch msgp.UnsafeString(field) {
						default:
							err = dc.Skip()
							if err != nil {
								err = msgp.WrapError(err, "Opts", "BaseOptions")
								return
							}
						}
					}
				default:
					err = dc.Skip()
					if err != nil {
						err = msgp.WrapError(err, "Opts")
						return
					}
				}
			}
		default:
			err = dc.Skip()
			if err != nil {

/**
 * Helper class for sending notifications to various platforms.
 */
public class NotificationHelper {

    /**
     * Default constructor.
     */
    public NotificationHelper() {
        // Default constructor
    }

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

    /** Line feed character for message formatting. */

    protected FessConfig fessConfig;

    /** Behavior class for user database operations */
    @Resource
    protected UserBhv userBhv;

    /**
     * Default constructor for GroupService.
     */
    public GroupService() {
        // Default constructor
    }

    /**
     * Retrieves a paginated list of groups based on the provided pager criteria.

 */
public abstract class SessionServicePacket {

    /**
     * Default constructor for SessionServicePacket.
     * Creates a new session service packet instance.
     */
    public SessionServicePacket() {
        // Default constructor
    }

    // session service packet types
    static final int SESSION_MESSAGE = 0x00;

import jcifs.smb1.util.LogStream;

/**
 * Lmhosts file handling for NetBIOS name resolution.
 */
public class Lmhosts {

    /**
     * Default constructor for Lmhosts.
     */
    public Lmhosts() {
        // Default constructor
    }

    private static final String FILENAME = Config.getProperty("jcifs.smb1.netbios.lmhosts");
    private static final Hashtable TAB = new Hashtable();

     *
     * @param properties The map containing key-value pairs to be interpolated.
     * @param callback The function to resolve variable values not found in the map.
     */
    default void interpolate(@Nonnull Map<String, String> properties, @Nullable UnaryOperator<String> callback) {
        interpolate(properties, callback, null, true);
    }

    /**

public class UserInfoService {

    @Resource
    private UserInfoBhv userInfoBhv;

    @Resource
    private SystemHelper systemHelper;

    /**
     * Default constructor for UserInfoService.
     */
    public UserInfoService() {
        // Default constructor
    }

    /**
     * Deletes user information records older than the specified number of days.