ProjectSpecs.java

package com.aemreunal.repository.project;

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

import java.util.ArrayList;
import javax.persistence.criteria.Predicate;
import org.springframework.data.jpa.domain.Specification;
import com.aemreunal.domain.Project;
import com.aemreunal.domain.User;

public class ProjectSpecs {

    /**
     * Creates the Project search specification from the given attributes
     *
     * @param owner
     *         The owner of the projects to search in
     * @param projectName
     *         The Project Name attribute to search for
     *
     * @return The specification of the project
     */
    public static Specification<Project> projectWithSpecification(final User owner, final String projectName) {
        return (root, query, builder) -> {
            ArrayList<Predicate> predicates = new ArrayList<Predicate>();

            predicates.add(builder.equal(root.get("owner").as(User.class), owner));

            if (!projectName.equals("")) {
                predicates.add(builder.like(builder.upper(root.get("name").as(String.class)), "%" + projectName.toUpperCase() + "%"));
            }

            return builder.and(predicates.toArray(new Predicate[predicates.size()]));
        };
    }

    // TODO project date search: http://stackoverflow.com/a/5790681/2246876
}