Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php |
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| 8 | class TeamController extends CRUDController |
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| 9 | { |
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| 10 | /** |
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| 11 | * The new leader if we're changing them |
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| 12 | * @var null|Player |
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| 13 | */ |
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| 14 | private $newLeader = null; |
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| 15 | |||
| 16 | 1 | public function showAction(Team $team) |
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| 32 | |||
| 33 | 1 | public function listAction() |
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| 48 | |||
| 49 | public function createAction(Player $me) |
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| 50 | { |
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| 51 | return $this->create($me); |
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| 52 | } |
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| 53 | |||
| 54 | View Code Duplication | public function editAction(Player $me, Team $team) |
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| 55 | { |
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| 56 | // TODO: Generating this response is unnecessary |
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| 57 | $response = $this->edit($team, $me, "team"); |
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| 58 | |||
| 59 | if ($this->newLeader) { |
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| 60 | // Redirect to a confirmation form if we are assigning a new leader |
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| 61 | $url = Service::getGenerator()->generate('team_assign_leader', array( |
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| 62 | 'team' => $team->getAlias(), |
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| 63 | 'player' => $this->newLeader->getAlias() |
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| 64 | )); |
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| 65 | |||
| 66 | return new RedirectResponse($url); |
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| 67 | } |
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| 68 | |||
| 69 | return $response; |
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| 70 | } |
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| 71 | |||
| 72 | 1 | public function deleteAction(Player $me, Team $team) |
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| 81 | |||
| 82 | View Code Duplication | public function joinAction(Team $team, Player $me) |
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| 83 | { |
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| 84 | $this->requireLogin(); |
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| 85 | if (!$me->isTeamless()) { |
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| 86 | throw new ForbiddenException("You are already a member of a team"); |
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| 87 | } elseif ($team->getStatus() != 'open') { |
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| 88 | throw new ForbiddenException("This team is not accepting new members without an invitation"); |
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| 89 | } |
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| 90 | |||
| 91 | return $this->showConfirmationForm(function () use ($team, $me) { |
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| 92 | $team->addMember($me->getId()); |
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| 93 | Service::getDispatcher()->dispatch(Events::TEAM_JOIN, new Event\TeamJoinEvent($team, $me)); |
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| 94 | |||
| 95 | return new RedirectResponse($team->getUrl()); |
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| 96 | }, "Are you sure you want to join {$team->getEscapedName()}?", |
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| 97 | "You are now a member of {$team->getName()}"); |
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| 98 | } |
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| 99 | |||
| 100 | 1 | public function kickAction(Team $team, Player $player, Player $me) |
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| 121 | |||
| 122 | 1 | View Code Duplication | public function abandonAction(Team $team, Player $me) |
| 140 | |||
| 141 | public function assignLeaderAction(Team $team, Player $me, Player $player) |
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| 142 | { |
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| 143 | $this->assertCanEdit($me, $team, "You are not allowed to change the leader of this team."); |
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| 144 | |||
| 145 | if (!$team->isMember($player->getId())) { |
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| 146 | throw new ForbiddenException("The specified player is not a member of {$team->getName()}"); |
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| 147 | } elseif ($team->getLeader()->isSameAs($player)) { |
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| 148 | throw new ForbiddenException("{$player->getUsername()} is already the leader of {$team->getName()}"); |
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| 149 | } |
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| 150 | |||
| 151 | return $this->showConfirmationForm(function () use ($player, $team) { |
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| 152 | $event = new Event\TeamLeaderChangeEvent($team, $player, $team->getLeader()); |
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| 153 | $team->setLeader($player->getId()); |
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| 154 | Service::getDispatcher()->dispatch(Events::TEAM_LEADER_CHANGE, $event); |
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| 155 | |||
| 156 | return new RedirectResponse($team->getUrl()); |
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| 157 | }, "Are you sure you want to transfer the leadership of the team to <strong>{$player->getEscapedUsername()}</strong>?", |
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| 158 | "{$player->getUsername()} is now leading {$team->getName()}", |
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| 159 | "Appoint leadership"); |
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| 160 | } |
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| 161 | |||
| 162 | /** |
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| 163 | * Show a confirmation form to confirm that the user wants to assign a new |
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| 164 | * leader to a team |
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| 165 | * |
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| 166 | * @param Player $leader The new leader |
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| 167 | */ |
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| 168 | public function newLeader($leader) |
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| 169 | { |
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| 170 | $this->newLeader = $leader; |
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| 171 | } |
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| 172 | |||
| 173 | protected function validateNew($form) |
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| 174 | { |
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| 175 | $name = $form->get('name'); |
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| 176 | $team = Team::getFromName($name->getData()); |
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| 177 | |||
| 178 | // The name for the team that the user gave us already exists |
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| 179 | // TODO: This takes deleted teams into account, do we want that? |
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| 180 | if ($team->isValid()) { |
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| 181 | $name->addError(new FormError("A team called {$team->getName()} already exists")); |
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| 182 | } |
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| 183 | } |
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| 184 | |||
| 185 | protected function canCreate($player) |
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| 186 | { |
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| 187 | if ($player->getTeam()->isValid()) { |
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| 188 | throw new ForbiddenException("You need to abandon your current team before you can create a new one"); |
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| 189 | } |
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| 190 | |||
| 191 | return parent::canCreate($player); |
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| 192 | } |
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| 193 | |||
| 194 | /** |
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| 195 | * Make sure that a player can edit a team |
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| 196 | * |
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| 197 | * Throws an exception if a player is not an admin or the leader of a team |
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| 198 | * @param Player $player The player to test |
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| 199 | * @param Team $team The team |
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| 200 | * @param string $message The error message to show |
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| 201 | * @throws HTTPException |
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| 202 | * @return void |
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| 203 | */ |
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| 204 | 1 | private function assertCanEdit(Player $player, Team $team, $message = "You are not allowed to edit that team") |
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| 210 | } |
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| 211 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: