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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| 24 | class EmailDirectionProvider implements DirectionProviderInterface  | 
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| 25 | { | 
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| 26 | /**  | 
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| 27 | * @var ConfigProvider  | 
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| 28 | */  | 
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| 29 | protected $configProvider;  | 
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| 30 | |||
| 31 | /**  | 
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| 32 | * @var DoctrineHelper  | 
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| 33 | */  | 
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| 34 | protected $doctrineHelper;  | 
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| 35 | |||
| 36 | /**  | 
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| 37 | * @param ConfigProvider $configProvider  | 
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| 38 | * @param DoctrineHelper $doctrineHelper  | 
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| 39 | */  | 
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| 40 | public function __construct(  | 
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| 41 | ConfigProvider $configProvider,  | 
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| 42 | DoctrineHelper $doctrineHelper,  | 
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| 43 | EmailHolderHelper $emailHolderHelper  | 
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| 44 |     ) { | 
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| 45 | $this->configProvider = $configProvider;  | 
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| 46 | $this->doctrineHelper = $doctrineHelper;  | 
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| 47 | $this->emailHolderHelper = $emailHolderHelper;  | 
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                         | 
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| 48 | }  | 
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| 49 | |||
| 50 | /**  | 
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| 51 |      * {@inheritdoc} | 
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| 52 | */  | 
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| 53 | public function getSupportedClass()  | 
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| 57 | |||
| 58 | /**  | 
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| 59 |      * {@inheritdoc} | 
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| 60 | */  | 
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| 61 | public function getDirection($activity, $target)  | 
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| 62 |     { | 
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| 63 | //check if target is entity created from admin part  | 
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| 64 |         if (!$target instanceof EmailHolderInterface) { | 
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| 65 | $metadata = $this->doctrineHelper->getEntityMetadata($target);  | 
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| 66 | $columns = $metadata->getColumnNames();  | 
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| 67 | $className = get_class($target);  | 
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| 68 | |||
| 69 |             foreach ($columns as $column) { | 
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| 70 | //check only columns with 'contact_information'  | 
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| 71 |                 if ($this->isEmailType($className, $column)) { | 
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| 72 | $getMethodName = "get" . Inflector::classify($column);  | 
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| 73 | /** @var $activity Email */  | 
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| 74 |                     if ($activity->getFromEmailAddress()->getEmail() === $target->$getMethodName()) { | 
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| 75 | return DirectionProviderInterface::DIRECTION_OUTGOING;  | 
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| 76 |                     } else { | 
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| 77 |                         foreach ($activity->getTo() as $recipient) { | 
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| 78 |                             if ($recipient->getEmailAddress()->getEmail() === $target->$getMethodName()) { | 
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| 79 | return DirectionProviderInterface::DIRECTION_INCOMING;  | 
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| 80 | }  | 
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| 81 | }  | 
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| 82 | }  | 
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| 83 | }  | 
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| 84 | }  | 
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| 85 | |||
| 86 | return DirectionProviderInterface::DIRECTION_UNKNOWN;  | 
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| 87 | }  | 
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| 88 | |||
| 89 | /** @var $activity Email */  | 
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| 90 | /** @var $target EmailHolderInterface */  | 
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| 91 |         if ($activity->getFromEmailAddress()->getEmail() === $target->getEmail()) { | 
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| 92 | return DirectionProviderInterface::DIRECTION_OUTGOING;  | 
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| 93 | }  | 
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| 94 | |||
| 95 | return DirectionProviderInterface::DIRECTION_INCOMING;  | 
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| 96 | }  | 
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| 97 | |||
| 98 | /**  | 
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| 99 | * @param string $className  | 
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| 100 | * @param string|null $column  | 
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| 101 | *  | 
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| 102 | * @return bool  | 
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| 103 | */  | 
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| 104 | protected function isEmailType($className, $column)  | 
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| 105 |     { | 
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| 106 |         if ($this->configProvider->hasConfig($className, $column)) { | 
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| 107 | $fieldConfiguration = $this->configProvider->getConfig($className, $column);  | 
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| 108 |             $type = $fieldConfiguration->get('contact_information'); | 
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| 109 | |||
| 110 | return $type == ContactInformationFieldsProvider::CONTACT_INFORMATION_SCOPE_EMAIL;  | 
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| 111 | }  | 
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| 112 | |||
| 113 | return false;  | 
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| 114 | }  | 
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| 115 | |||
| 116 | /**  | 
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| 117 |      * {@inheritdoc} | 
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| 118 | */  | 
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| 119 | public function isDirectionChanged($changeSet = [])  | 
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| 120 |     { | 
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| 121 | /**  | 
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| 122 | * For emails direction never can be changed at all.  | 
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| 123 | */  | 
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| 124 | return false;  | 
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| 125 | }  | 
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| 126 | |||
| 127 | /**  | 
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| 128 |      * {@inheritdoc} | 
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| 129 | */  | 
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| 130 | public function getDate($activity)  | 
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| 131 |     { | 
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| 132 | /** @var $activity Email */  | 
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| 133 |         return $activity->getSentAt() ? : new \DateTime('now', new \DateTimeZone('UTC')); | 
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| 134 | }  | 
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| 135 | |||
| 136 | /**  | 
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| 137 |      * {@inheritdoc} | 
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| 138 | */  | 
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| 139 | View Code Duplication | public function getLastActivitiesDateForTarget(EntityManager $em, $target, $direction, $skipId = null)  | 
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| 159 | |||
| 160 | /**  | 
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| 161 | * @param EntityManager $em  | 
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| 162 | * @param object $target  | 
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| 163 | * @param integer $skipId  | 
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| 164 | * @param string $direction  | 
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| 165 | *  | 
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| 166 | * @return Email  | 
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| 167 | */  | 
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| 168 | protected function getLastActivity(EntityManager $em, $target, $skipId = null, $direction = null)  | 
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| 169 |     { | 
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| 170 |         $qb = $em->getRepository('Oro\Bundle\EmailBundle\Entity\Email') | 
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| 171 |             ->createQueryBuilder('email') | 
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| 172 |             ->select('email') | 
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| 173 | ->innerJoin(  | 
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| 174 | sprintf(  | 
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| 175 | 'email.%s',  | 
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| 176 | ExtendHelper::buildAssociationName(ClassUtils::getClass($target), ActivityScope::ASSOCIATION_KIND)  | 
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| 177 | ),  | 
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| 178 | 'target'  | 
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| 179 | )  | 
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| 180 |             ->andWhere('target = :target') | 
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| 181 |             ->orderBy('email.sentAt', 'DESC') | 
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| 182 | ->setMaxResults(1)  | 
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| 183 |             ->setParameter('target', $target); | 
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| 184 | |||
| 185 |         if ($skipId) { | 
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| 186 |             $qb->andWhere('email.id <> :skipId') | 
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| 187 |                 ->setParameter('skipId', $skipId); | 
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| 188 | }  | 
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| 189 | |||
| 190 |         if ($direction && $target instanceof EmailHolderInterface) { | 
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| 191 | $operator = '!=';  | 
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| 192 |             if ($direction === DirectionProviderInterface::DIRECTION_OUTGOING) { | 
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| 193 | $operator = '=';  | 
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| 194 | }  | 
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| 195 | |||
| 196 |             $qb->join('email.fromEmailAddress', 'fromEmailAddress') | 
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| 197 |                 ->andWhere('fromEmailAddress.email ' . $operator . ':email') | 
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| 198 |                 ->setParameter('email', $this->getTargetEmail($target)); | 
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| 199 | }  | 
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| 200 | |||
| 201 | return $qb->getQuery()->getOneOrNullResult();  | 
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| 202 | }  | 
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| 203 | |||
| 204 | /**  | 
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| 205 | * @param object $target  | 
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| 206 | * @return string  | 
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| 207 | */  | 
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| 208 | protected function getTargetEmail($target)  | 
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| 212 | }  | 
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| 213 | 
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: