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<?php |
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/** |
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* PHP-DI |
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* |
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* @link http://php-di.org/ |
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* @copyright Matthieu Napoli (http://mnapoli.fr/) |
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* @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file) |
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*/ |
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|
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namespace DI\Definition\Source; |
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|
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use DI\Definition\Definition; |
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use DI\Definition\HasSubDefinition; |
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|
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/** |
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* Manages a chain of other definition sources. |
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* |
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* @author Matthieu Napoli <matthieu@mnapoli.fr> |
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*/ |
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class SourceChain implements DefinitionSource, MutableDefinitionSource |
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{ |
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/** |
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* @var DefinitionSource[] |
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*/ |
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private $sources; |
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|
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/** |
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* @var DefinitionSource |
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*/ |
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private $rootSource; |
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|
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/** |
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* @var MutableDefinitionSource|null |
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*/ |
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private $mutableSource; |
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|
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/** |
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* @param DefinitionSource[] $sources |
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*/ |
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public function __construct(array $sources) |
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{ |
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// We want a numerically indexed array to ease the traversal later |
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$this->sources = array_values($sources); |
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$this->rootSource = $this; |
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} |
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|
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/** |
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* {@inheritdoc} |
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* @param int $startIndex Use this parameter to start looking from a specific |
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* point in the source chain. |
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*/ |
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public function getDefinition($name, $startIndex = 0) |
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{ |
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$count = count($this->sources); |
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for ($i = $startIndex; $i < $count; $i++) { |
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$source = $this->sources[$i]; |
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|
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$definition = $source->getDefinition($name); |
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|
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if ($definition) { |
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if ($definition instanceof HasSubDefinition) { |
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$this->resolveSubDefinition($definition, $i); |
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} |
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return $definition; |
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} |
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} |
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|
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return null; |
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} |
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|
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public function addDefinition(Definition $definition) |
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{ |
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if (! $this->mutableSource) { |
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throw new \LogicException("The container's definition source has not been initialized correctly"); |
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} |
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|
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$this->mutableSource->addDefinition($definition); |
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} |
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|
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public function setRootDefinitionSource(DefinitionSource $rootSource) |
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{ |
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$this->rootSource = $rootSource; |
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} |
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|
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private function resolveSubDefinition(HasSubDefinition $definition, $currentIndex) |
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{ |
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$subDefinitionName = $definition->getSubDefinitionName(); |
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|
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if ($subDefinitionName === $definition->getName()) { |
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// Extending itself: look in the next sources only (else infinite recursion) |
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$subDefinition = $this->getDefinition($subDefinitionName, $currentIndex + 1); |
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} else { |
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// Extending another definition: look from the root |
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$subDefinition = $this->rootSource->getDefinition($subDefinitionName); |
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} |
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|
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if ($subDefinition) { |
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$definition->setSubDefinition($subDefinition); |
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} |
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} |
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|
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public function setMutableDefinitionSource(MutableDefinitionSource $mutableSource) |
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{ |
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$this->mutableSource = $mutableSource; |
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|
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array_unshift($this->sources, $mutableSource); |
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} |
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} |
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|
