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The project that holds the entities and the spring data repositories for save files in postgresql database

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/**
 * The MIT License
 *
 * Copyright (C) 2015 Asterios Raptis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package de.alpharogroup.user.auth.jpa.repositories;

import java.util.Optional;
import java.util.UUID;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import de.alpharogroup.user.auth.jpa.entities.Users;

@Repository
public interface UsersRepository extends JpaRepository
{

	/**
	 * Checks if an {@link Users} object exists with the given user name
	 *
	 * @param username
	 *            the user name
	 * @return true if a {@link Users} object exists with the given user name
	 */
	boolean existsByUsername(final String username);

	/**
	 * Checks if an {@link Users} object exists with the given email
	 *
	 * @param email
	 *            the email
	 * @return true if a {@link Users} object exists with the given email
	 */
	boolean existsByEmail(final String email);

	/**
	 * Find {@link Users} object from the given user name.
	 *
	 * @param username
	 *            the user name
	 * @return the found {@link Users} object
	 */
	Optional findByUsername(final String username);

	/**
	 * Find {@link Users} object from the given users email
	 *
	 * @param email
	 *            the users email
	 * @return the found {@link Users} object
	 */
	Optional findByEmail(final String email);

}