UserSpecs.java

package com.aemreunal.repository.user;

/*
 * *********************** *
 * Copyright (c) 2015      *
 *                         *
 * This code belongs to:   *
 *                         *
 * @author Ahmet Emre Ünal *
 * S001974                 *
 *                         *
 * aemreunal@gmail.com     *
 * emre.unal@ozu.edu.tr    *
 *                         *
 * aemreunal.com           *
 * *********************** *
 */

import org.springframework.data.jpa.domain.Specification;
import com.aemreunal.domain.User;

public class UserSpecs {
    /**
     * Creates the User search specification by the given username. Currently used for
     * searching whether a given username is unique.
     *
     * @param username
     *         The username of the User to find
     *
     * @return The specification of the user with the given username
     */
    public static Specification<User> usernameSpecification(final String username) {
        return (root, query, builder) -> builder.equal(builder.upper(root.get("username").as(String.class)), username.toUpperCase());
    }
}