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.List;

public final class PGComponentDao implements ComponentDao {

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

    public PGComponentDao(Connection connection) throws SQLException {
        final var query = "select id, name, node, color, ordinal, description, " +
                "userid, username, givenname, lastname, mail " +
                "from lpit_component " +
                "left join lpit_user on lead = userid";

        list = connection.prepareStatement(query + " where project = ? " +
                        "order by ordinal desc, lower(name) desc");

        find = connection.prepareStatement(query + " where id = ? ");

        findByNode = connection.prepareStatement(query + " where project = ? and node = ?");

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

        update = connection.prepareStatement(
                "update lpit_component set name = ?, node = ?, 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"));
        component.setNode(result.getString("node"));
        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;
    }

    private static int setColumns(PreparedStatement stmt, Component instance) throws SQLException {
        int column = 0;
        stmt.setString(++column, instance.getName());
        stmt.setString(++column, instance.getNode());
        stmt.setString(++column, instance.getColor().getHex());
        stmt.setInt(++column, instance.getOrdinal());
        Functions.setStringOrNull(stmt, ++column, instance.getDescription());
        Functions.setForeignKeyOrNull(stmt, ++column, instance.getLead(), User::getId);
        return column;
    }

    @Override
    public void save(Component instance, Project project) throws SQLException {
        int column = setColumns(insert, instance);
        insert.setInt(++column, project.getId());
        insert.executeUpdate();
    }

    @Override
    public boolean update(Component instance) throws SQLException {
        if (instance.getId() < 0) return false;
        int column = setColumns(update, instance);
        update.setInt(++column, instance.getId());
        return update.executeUpdate() > 0;
    }


    @Override
    public List<Component> list(Project project) throws SQLException {
        list.setInt(1, project.getId());
        return Functions.list(list, PGComponentDao::mapColumns);
    }

    @Override
    public Component find(int id) throws SQLException {
        find.setInt(1, id);
        return Functions.find(find, PGComponentDao::mapColumns);
    }

    @Override
    public Component findByNode(Project project, String node) throws SQLException {
        findByNode.setInt(1, project.getId());
        findByNode.setString(2, node);;
        return Functions.find(findByNode, PGComponentDao::mapColumns);
    }
}