src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2018 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */
package de.uapcore.lightpit.dao.postgres;

import de.uapcore.lightpit.dao.ProjectDao;
import de.uapcore.lightpit.entities.Project;
import de.uapcore.lightpit.entities.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import static de.uapcore.lightpit.dao.Functions.setForeignKeyOrNull;
import static de.uapcore.lightpit.dao.Functions.setStringOrNull;

public final class PGProjectDao implements ProjectDao {

    private final PreparedStatement insert, update, list, find;
    private final PreparedStatement issue_summary;

    public PGProjectDao(Connection connection) throws SQLException {
        list = connection.prepareStatement(
                "select projectid, name, description, repourl, " +
                        "userid, username, lastname, givenname, mail " +
                        "from lpit_project " +
                        "left join lpit_user owner on lpit_project.owner = owner.userid " +
                        "order by name");

        find = connection.prepareStatement(
                "select projectid, name, description, repourl, " +
                        "userid, username, lastname, givenname, mail " +
                        "from lpit_project " +
                        "left join lpit_user owner on lpit_project.owner = owner.userid " +
                        "where projectid = ?");

        issue_summary = connection.prepareStatement(
                "select phase, count(*) as total "+
                        "from lpit_issue " +
                        "join lpit_issue_phases using(status) " +
                        "where project = ? "+
                        "group by phase "
        );

        insert = connection.prepareStatement(
                "insert into lpit_project (name, description, repourl, owner) values (?, ?, ?, ?)"
        );
        update = connection.prepareStatement(
                "update lpit_project set name = ?, description = ?, repourl = ?, owner = ? where projectid = ?"
        );
    }

    public Project mapColumns(ResultSet result) throws SQLException {
        final var proj = new Project(result.getInt("projectid"));
        proj.setName(result.getString("name"));
        proj.setDescription(result.getString("description"));
        proj.setRepoUrl(result.getString("repourl"));

        final int id = result.getInt("userid");
        if (id != 0) {
            final var user = new User(id);
            user.setUsername(result.getString("username"));
            user.setGivenname(result.getString("givenname"));
            user.setLastname(result.getString("lastname"));
            user.setMail(result.getString("mail"));
            proj.setOwner(user);
        }

        return proj;
    }

    private void mapIssueSummary(Project proj) throws SQLException {
        issue_summary.setInt(1, proj.getId());
        final var result = issue_summary.executeQuery();
        while (result.next()) {
            final var phase = result.getInt("phase");
            final var total = result.getInt("total");
            switch(phase) {
                case 0:
                    proj.setOpenIssues(total);
                    break;
                case 1:
                    proj.setActiveIssues(total);
                    break;
                case 2:
                    proj.setDoneIssues(total);
                    break;
            }
        }
    }

    @Override
    public void save(Project instance) throws SQLException {
        Objects.requireNonNull(instance.getName());
        insert.setString(1, instance.getName());
        setStringOrNull(insert, 2, instance.getDescription());
        setStringOrNull(insert, 3, instance.getRepoUrl());
        setForeignKeyOrNull(insert, 4, instance.getOwner(), User::getId);
        insert.executeUpdate();
    }

    @Override
    public boolean update(Project instance) throws SQLException {
        if (instance.getId() < 0) return false;
        Objects.requireNonNull(instance.getName());
        update.setString(1, instance.getName());
        setStringOrNull(update, 2, instance.getDescription());
        setStringOrNull(update, 3, instance.getRepoUrl());
        setForeignKeyOrNull(update, 4, instance.getOwner(), User::getId);
        update.setInt(5, instance.getId());
        return update.executeUpdate() > 0;
    }

    @Override
    public List<Project> list() throws SQLException {
        List<Project> projects = new ArrayList<>();
        try (var result = list.executeQuery()) {
            while (result.next()) {
                final var project = mapColumns(result);
                mapIssueSummary(project);
                projects.add(project);
            }
        }
        return projects;
    }

    @Override
    public Project find(int id) throws SQLException {
        find.setInt(1, id);
        try (var result = find.executeQuery()) {
            if (result.next()) {
                final var project = mapColumns(result);
                mapIssueSummary(project);
                return project;
            } else {
                return null;
            }
        }
    }
}