src/main/java/de/uapcore/lightpit/dao/postgres/PGComponentDao.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
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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package de.uapcore.lightpit.dao.postgres;

import de.uapcore.lightpit.dao.ComponentDao;
import de.uapcore.lightpit.dao.Functions;
import de.uapcore.lightpit.entities.Component;
import de.uapcore.lightpit.entities.Project;
import de.uapcore.lightpit.entities.User;
import de.uapcore.lightpit.types.WebColor;

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;

public final class PGComponentDao implements ComponentDao {

    private final PreparedStatement insert, update, list, find;

    public PGComponentDao(Connection connection) throws SQLException {
        list = connection.prepareStatement(
                "select id, name, color, ordinal, description, " +
                        "userid, username, givenname, lastname, mail " +
                        "from lpit_component " +
                        "left join lpit_user on lead = userid " +
                        "where project = ? " +
                        "order by ordinal desc, lower(name) desc");

        find = connection.prepareStatement(
                "select id, name, color, ordinal, description, " +
                        "userid, username, givenname, lastname, mail " +
                        "from lpit_component " +
                        "left join lpit_user on lead = userid " +
                        "where id = ? ");

        insert = connection.prepareStatement(
                "insert into lpit_component (project, name, color, ordinal, description, lead) values (?, ?, ?, ?, ?, ?)"
        );

        update = connection.prepareStatement(
                "update lpit_component set name = ?, color = ?, ordinal = ?, description = ?, lead = ? where id = ?"
        );
    }

    private static Component mapColumns(ResultSet result) throws SQLException {
        final var component = new Component(result.getInt("id"));
        component.setName(result.getString("name"));
        try {
            component.setColor(new WebColor(result.getString("color")));
        } catch (IllegalArgumentException ex) {
            // if someone tempered with the database we default the color to black
            component.setColor(new WebColor("000000"));
        }
        component.setOrdinal(result.getInt("ordinal"));
        component.setDescription(result.getString("description"));
        component.setLead(PGUserDao.mapColumns(result));
        return component;
    }

    @Override
    public void save(Component instance, Project project) throws SQLException {
        Objects.requireNonNull(instance.getName());
        insert.setInt(1, project.getId());
        insert.setString(2, instance.getName());
        insert.setString(3, instance.getColor().getHex());
        insert.setInt(4, instance.getOrdinal());
        Functions.setStringOrNull(insert, 5, instance.getDescription());
        Functions.setForeignKeyOrNull(insert, 6, instance.getLead(), User::getId);
        insert.executeUpdate();
    }

    @Override
    public boolean update(Component instance) throws SQLException {
        if (instance.getId() < 0) return false;
        Objects.requireNonNull(instance.getName());
        Objects.requireNonNull(instance.getColor());
        update.setString(1, instance.getName());
        update.setString(2, instance.getColor().getHex());
        update.setInt(3, instance.getOrdinal());
        Functions.setStringOrNull(update, 4, instance.getDescription());
        Functions.setForeignKeyOrNull(update, 5, instance.getLead(), User::getId);
        update.setInt(6, instance.getId());
        return update.executeUpdate() > 0;
    }

    @Override
    public List<Component> list(Project project) throws SQLException {
        list.setInt(1, project.getId());
        List<Component> components = new ArrayList<>();
        try (var result = list.executeQuery()) {
            while (result.next()) {
                components.add(mapColumns(result));
            }
        }
        return components;
    }

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