src/main/java/de/uapcore/lightpit/dao/UserDao.java

/*
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 *
 * Copyright 2018 Mike Becker. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package de.uapcore.lightpit.dao;

import de.uapcore.lightpit.entities.User;

import java.sql.SQLException;
import java.util.Optional;

public interface UserDao extends RootEntityDao<User> {

    /**
     * Tries to find a user by their username.
     * The search is case-insensitive.
     *
     * @param username the username
     * @return the user object or an empty optional if no such user exists
     * @throws SQLException
     */
    Optional<User> findByUsername(String username) throws SQLException;
}