src/main/java/de/uapcore/lightpit/dao/postgres/PGIssueDao.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.IssueDao;
import de.uapcore.lightpit.entities.*;

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.*;

public final class PGIssueDao implements IssueDao {

    private final PreparedStatement insert, update, list, find;

    public PGIssueDao(Connection connection) throws SQLException {
        list = connection.prepareStatement(
                "select issue.id, issue.project, issue.status, issue.category, issue.subject, issue.description, " +
                        "vplan.id, vplan.name, vdone.id, vdone.name, " +
                        "issue.created, issue.updated, issue.eta " +
                        "from lpit_issue issue " +
                        "left join lpit_version vplan on vplan.id = version_plan " +
                        "left join lpit_version vdone on vdone.id = version_done " +
                        "where issue.project = ? ");

        find = connection.prepareStatement(
                "select issue.id, issue.project, issue.status, issue.category, issue.subject, issue.description, " +
                        "vplan.id, vplan.name, vdone.id, vdone.name, " +
                        "issue.created, issue.updated, issue.eta " +
                        "from lpit_issue issue " +
                        "left join lpit_version vplan on vplan.id = version_plan " +
                        "left join lpit_version vdone on vdone.id = version_done " +
                        "where issue.id = ? ");

        insert = connection.prepareStatement(
                "insert into lpit_issue (project, status, category, subject, description, version_plan, version_done, eta) " +
                        "values (?, ?::issue_status, ?::issue_category, ?, ?, ?, ?, ?)"
        );
        update = connection.prepareStatement(
                "update lpit_issue set updated = now(), status = ?::issue_status, category = ?::issue_category, " +
                        "subject = ?, description = ?, version_plan = ?, version_done = ?, eta = ? where id = ?"
        );
    }

    private Version obtainVersion(ResultSet result, Project project, String prefix) throws SQLException {
        final int vplan = result.getInt(prefix+"id");
        if (vplan > 0) {
            final var ver = new Version(vplan, project);
            ver.setName(result.getString(prefix+"name"));
            return ver;
        } else {
            return null;
        }
    }

    public Issue mapColumns(ResultSet result) throws SQLException {
        final var project = new Project(result.getInt("issue.project"));
        final var issue = new Issue(result.getInt("issue.id"), project);
        issue.setStatus(IssueStatus.valueOf(result.getString("issue.status")));
        issue.setCategory(IssueCategory.valueOf(result.getString("issue.category")));
        issue.setSubject(result.getString("issue.subject"));
        issue.setDescription(result.getString("issue.description"));
        issue.setScheduledVersion(obtainVersion(result, project, "vplan."));
        issue.setResolvedVersion(obtainVersion(result, project, "vdone."));
        issue.setCreated(result.getTimestamp("issue.created"));
        issue.setUpdated(result.getTimestamp("issue.updated"));
        issue.setEta(result.getDate("issue.eta"));
        return issue;
    }

    @Override
    public void save(Issue instance) throws SQLException {
        Objects.requireNonNull(instance.getSubject());
        Objects.requireNonNull(instance.getProject());
        insert.setInt(1, instance.getProject().getId());
        insert.setString(2, instance.getStatus().name());
        insert.setString(3, instance.getCategory().name());
        insert.setString(4, instance.getSubject());
        setStringOrNull(insert, 5, instance.getDescription());
        setForeignKeyOrNull(insert, 6, instance.getScheduledVersion(), Version::getId);
        setForeignKeyOrNull(insert, 7, instance.getResolvedVersion(), Version::getId);
        setDateOrNull(insert, 8, instance.getEta());
        insert.executeUpdate();
    }

    @Override
    public boolean update(Issue instance) throws SQLException {
        Objects.requireNonNull(instance.getSubject());
        update.setString(1, instance.getStatus().name());
        update.setString(2, instance.getCategory().name());
        update.setString(3, instance.getSubject());
        setStringOrNull(update, 4, instance.getDescription());
        setForeignKeyOrNull(update, 5, instance.getScheduledVersion(), Version::getId);
        setForeignKeyOrNull(update, 6, instance.getResolvedVersion(), Version::getId);
        setDateOrNull(update, 7, instance.getEta());
        update.setInt(8, instance.getId());
        return update.executeUpdate() > 0;
    }

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

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