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

/*
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 *
 * 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:
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 *      notice, this list of conditions and the following disclaimer.
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 *   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
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package de.uapcore.lightpit.dao.postgres;

import de.uapcore.lightpit.dao.VersionDao;
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;

public final class PGVersionDao implements VersionDao {

    private final PreparedStatement insert, update, list, find;
    private final PreparedStatement issuesAffected, issuesScheduled, issuesResolved;

    public PGVersionDao(Connection connection) throws SQLException {
        list = connection.prepareStatement(
                "select versionid, project, name, ordinal, status " +
                        "from lpit_version " +
                        "where project = ? " +
                        "order by ordinal desc, lower(name) desc");

        find = connection.prepareStatement(
                "select versionid, project, name, ordinal, status " +
                        "from lpit_version " +
                        "where versionid = ?");

        insert = connection.prepareStatement(
                "insert into lpit_version (project, name, ordinal, status) values (?, ?, ?, ?::version_status)"
        );
        update = connection.prepareStatement(
                "update lpit_version set name = ?, ordinal = ?, status = ?::version_status where versionid = ?"
        );

        issuesAffected = connection.prepareStatement(
                "select category, status, count(*) as issuecount " +
                        "from lpit_issue_affected_version " +
                        "join lpit_issue using (issueid) " +
                        "where versionid = ? " +
                        "group by category, status"
        );
        issuesScheduled = connection.prepareStatement(
                "select category, status, count(*) as issuecount " +
                        "from lpit_issue_scheduled_version " +
                        "join lpit_issue using (issueid) " +
                        "where versionid = ? " +
                        "group by category, status"
        );
        issuesResolved = connection.prepareStatement(
                "select category, status, count(*) as issuecount " +
                        "from lpit_issue_resolved_version " +
                        "join lpit_issue using (issueid) " +
                        "where versionid = ? " +
                        "group by category, status"
        );
    }

    private Version mapColumns(ResultSet result) throws SQLException {
        final var project = new Project(result.getInt("project"));
        final var version = new Version(result.getInt("versionid"), project);
        version.setName(result.getString("name"));
        version.setOrdinal(result.getInt("ordinal"));
        version.setStatus(VersionStatus.valueOf(result.getString("status")));
        return version;
    }

    private VersionStatistics versionStatistics(Version version, PreparedStatement stmt) throws SQLException {
        stmt.setInt(1, version.getId());
        final var result = stmt.executeQuery();
        final var stats = new VersionStatistics(version);
        while (result.next()) {
            stats.setIssueCount(
                    IssueCategory.valueOf(result.getString("category")),
                    IssueStatus.valueOf(result.getString("status")),
                    result.getInt("issuecount")
            );
        }
        return stats;
    }

    @Override
    public void save(Version instance) throws SQLException {
        Objects.requireNonNull(instance.getName());
        Objects.requireNonNull(instance.getProject());
        insert.setInt(1, instance.getProject().getId());
        insert.setString(2, instance.getName());
        insert.setInt(3, instance.getOrdinal());
        insert.setString(4, instance.getStatus().name());
        insert.executeUpdate();
    }

    @Override
    public boolean update(Version instance) throws SQLException {
        if (instance.getId() < 0) return false;
        Objects.requireNonNull(instance.getName());
        update.setString(1, instance.getName());
        update.setInt(2, instance.getOrdinal());
        update.setString(3, instance.getStatus().name());
        update.setInt(4, instance.getId());
        return update.executeUpdate() > 0;
    }

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

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

    @Override
    public VersionStatistics statsOpenedIssues(Version version) throws SQLException {
        return versionStatistics(version, issuesAffected);
    }

    @Override
    public VersionStatistics statsScheduledIssues(Version version) throws SQLException {
        return versionStatistics(version, issuesScheduled);
    }

    @Override
    public VersionStatistics statsResolvedIssues(Version version) throws SQLException {
        return versionStatistics(version, issuesResolved);
    }
}