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

/*
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 * Copyright 2018 Mike Becker. All rights reserved.
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 * 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
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package de.uapcore.lightpit.dao.postgres;

import de.uapcore.lightpit.dao.GenericDao;
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, GenericDao<Project> {

    private final PreparedStatement insert, update, list, find;

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

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

    public Project mapColumns(ResultSet result) throws SQLException {
        final var proj = new Project(result.getInt("id"));
        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;
    }

    @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 {
        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()) {
                projects.add(mapColumns(result));
            }
        }
        return projects;
    }

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