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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17 | { |
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18 | 1 | $matches = $this->getQueryBuilder('Match') |
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19 | 1 | ->with($team) |
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20 | 1 | ->getSummary($team); |
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21 | |||
22 | 1 | $wins = $this->getQueryBuilder('Match') |
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23 | 1 | ->with($team, "win") |
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24 | 1 | ->getSummary($team); |
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25 | |||
26 | return array( |
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27 | 1 | "matches" => $matches, |
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28 | 1 | "wins" => $wins, |
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29 | "team" => $team |
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30 | 1 | ); |
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31 | } |
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32 | |||
33 | 1 | public function listAction() |
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34 | { |
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35 | 1 | Team::$cachedMatches = $this->getQueryBuilder('Match') |
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36 | 1 | ->where('time')->isAfter(TimeDate::from('45 days ago')) |
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37 | 1 | ->active() |
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38 | 1 | ->getModels($fast = true); |
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39 | |||
40 | 1 | $teams = $this->getQueryBuilder() |
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41 | 1 | ->sortBy('elo')->reverse() |
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42 | 1 | ->getModels($fast = true); |
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43 | |||
44 | return array( |
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45 | "teams" => $teams |
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46 | 1 | ); |
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47 | } |
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48 | |||
49 | public function createAction(Player $me) |
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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 | public function deleteAction(Player $me, Team $team) |
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73 | { |
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74 | $members = $team->getMembers(); |
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75 | |||
76 | return $this->delete($team, $me, function () use ($team, $me, $members) { |
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77 | $event = new Event\TeamDeleteEvent($team, $me, $members); |
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78 | Service::getDispatcher()->dispatch(Events::TEAM_DELETE, $event); |
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79 | }); |
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80 | } |
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81 | |||
82 | View Code Duplication | public function joinAction(Team $team, Player $me) |
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99 | |||
100 | public function kickAction(Team $team, Player $player, Player $me) |
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101 | { |
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102 | $this->assertCanEdit($me, $team, "You are not allowed to kick a player off that team!"); |
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103 | |||
104 | if ($team->getLeader()->isSameAs($player)) { |
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105 | throw new ForbiddenException("You can't kick the leader off their team."); |
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106 | } |
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107 | |||
108 | if (!$team->isMember($player->getId())) { |
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109 | throw new ForbiddenException("The specified player is not a member of that team."); |
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110 | } |
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111 | |||
112 | return $this->showConfirmationForm(function () use ($me, $team, $player) { |
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113 | $team->removeMember($player->getId()); |
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114 | $event = new Event\TeamKickEvent($team, $player, $me); |
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115 | Service::getDispatcher()->dispatch(Events::TEAM_KICK, $event); |
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116 | |||
117 | return new RedirectResponse($team->getUrl()); |
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118 | }, "Are you sure you want to kick {$player->getEscapedUsername()} from {$team->getEscapedName()}?", |
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119 | "Player {$player->getUsername()} has been kicked from {$team->getName()}", "Kick"); |
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120 | } |
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121 | |||
122 | View Code Duplication | public function abandonAction(Team $team, Player $me) |
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123 | { |
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124 | if (!$team->isMember($me->getId())) { |
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125 | throw new ForbiddenException("You are not a member of that team!"); |
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126 | } |
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127 | |||
128 | if ($team->getLeader()->isSameAs($me)) { |
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129 | throw new ForbiddenException("You can't abandon the team you are leading."); |
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130 | } |
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131 | |||
132 | return $this->showConfirmationForm(function () use ($team, $me) { |
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133 | $team->removeMember($me->getId()); |
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134 | Service::getDispatcher()->dispatch(Events::TEAM_ABANDON, new Event\TeamAbandonEvent($team, $me)); |
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135 | |||
136 | return new RedirectResponse($team->getUrl()); |
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137 | }, "Are you sure you want to abandon {$team->getEscapedName()}?", |
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138 | "You have left {$team->getName()}", "Abandon"); |
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139 | } |
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140 | |||
141 | public function assignLeaderAction(Team $team, Player $me, Player $player) |
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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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172 | |||
173 | protected function validateNew($form) |
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184 | |||
185 | protected function canCreate($player) |
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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 | 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: