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<?php |
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/* |
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* This file is part of the Ivory Serializer package. |
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* |
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* (c) Eric GELOEN <[email protected]> |
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* |
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* For the full copyright and license information, please read the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Ivory\Serializer\Context; |
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use Ivory\Serializer\Exclusion\ExclusionStrategy; |
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use Ivory\Serializer\Exclusion\ExclusionStrategyInterface; |
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use Ivory\Serializer\Mapping\MetadataInterface; |
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use Ivory\Serializer\Naming\IdenticalNamingStrategy; |
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use Ivory\Serializer\Naming\NamingStrategyInterface; |
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use Ivory\Serializer\Navigator\NavigatorInterface; |
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use Ivory\Serializer\Visitor\VisitorInterface; |
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/** |
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* @author GeLo <[email protected]> |
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*/ |
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class Context implements ContextInterface |
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{ |
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/** |
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* @var NavigatorInterface |
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*/ |
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private $navigator; |
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/** |
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* @var VisitorInterface |
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*/ |
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private $visitor; |
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/** |
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* @var int |
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*/ |
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private $direction; |
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/** |
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* @var string |
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*/ |
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private $format; |
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/** |
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* @var bool |
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*/ |
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private $ignoreNull = false; |
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/** |
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* @var ExclusionStrategyInterface |
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*/ |
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private $exclusionStrategy; |
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/** |
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* @var NamingStrategyInterface |
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*/ |
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private $namingStrategy; |
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/** |
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* @var mixed[] |
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*/ |
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private $dataStack; |
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/** |
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* @var MetadataInterface[] |
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*/ |
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private $metadataStack; |
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/** |
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* @var mixed[] |
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*/ |
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private $options = []; |
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/** |
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* @param ExclusionStrategyInterface|null $exclusionStrategy |
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* @param NamingStrategyInterface|null $namingStrategy |
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*/ |
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public function __construct( |
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ExclusionStrategyInterface $exclusionStrategy = null, |
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NamingStrategyInterface $namingStrategy = null |
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) { |
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$this->exclusionStrategy = $exclusionStrategy ?: new ExclusionStrategy(); |
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$this->namingStrategy = $namingStrategy ?: new IdenticalNamingStrategy(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function initialize(NavigatorInterface $navigator, VisitorInterface $visitor, $direction, $format) |
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{ |
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$this |
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->setNavigator($navigator) |
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->setVisitor($visitor) |
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->setDirection($direction) |
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->setFormat($format) |
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->setDataStack([]) |
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->setMetadataStack([]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getNavigator() |
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{ |
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return $this->navigator; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setNavigator(NavigatorInterface $navigator) |
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{ |
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$this->navigator = $navigator; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getVisitor() |
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{ |
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return $this->visitor; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setVisitor(VisitorInterface $visitor) |
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{ |
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$this->visitor = $visitor; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getDirection() |
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{ |
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return $this->direction; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setDirection($direction) |
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{ |
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$this->direction = $direction; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getFormat() |
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{ |
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return $this->format; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setFormat($format) |
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{ |
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$this->format = $format; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isNullIgnored() |
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{ |
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return $this->ignoreNull; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setIgnoreNull($ignoreNull) |
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{ |
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$this->ignoreNull = $ignoreNull; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getExclusionStrategy() |
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{ |
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return $this->exclusionStrategy; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setExclusionStrategy(ExclusionStrategyInterface $exclusionStrategy) |
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{ |
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$this->exclusionStrategy = $exclusionStrategy; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getNamingStrategy() |
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{ |
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return $this->namingStrategy; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setNamingStrategy(NamingStrategyInterface $namingStrategy) |
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{ |
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$this->namingStrategy = $namingStrategy; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getDataStack() |
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{ |
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return $this->dataStack; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setDataStack(array $dataStack) |
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{ |
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$this->dataStack = $dataStack; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMetadataStack() |
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{ |
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return $this->metadataStack; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setMetadataStack(array $metadataStack) |
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{ |
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$this->metadataStack = $metadataStack; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function enterScope($data, MetadataInterface $metadata) |
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{ |
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$this->dataStack[] = $data; |
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$this->metadataStack[] = $metadata; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function leaveScope() |
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{ |
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array_pop($this->dataStack); |
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array_pop($this->metadataStack); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function hasOptions() |
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{ |
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return $this->options; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getOptions() |
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{ |
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return $this->options; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setOptions(array $options) |
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{ |
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$this->options = []; |
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$this->addOptions($options); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function addOptions(array $options) |
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{ |
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foreach ($options as $option => $value) { |
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$this->setOption($option, $value); |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function hasOption($option) |
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{ |
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return array_key_exists($option, $this->options); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getOption($option) |
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{ |
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return $this->hasOption($option) ? $this->options[$option] : null; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setOption($option, $value) |
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{ |
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$this->options[$option] = $value; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function removeOption($option) |
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{ |
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unset($this->options[$option]); |
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return $this; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.