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<?php namespace GenericCollections\Traits; |
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use GenericCollections\Internal\DoubleLinkedList; |
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/** |
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* This trait include all deque standard methods to queue, stack and deque |
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* |
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* @property DoubleLinkedList $storage |
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* |
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* @package GenericCollections\Traits |
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*/ |
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trait DequeCommonMethods |
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{ |
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/** |
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* Protected method to do the checks for add and offer methods |
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* |
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* @param $element |
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* @return string The reason why this would produce an error |
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*/ |
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private function checkAddOffer($element) |
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{ |
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// always throw an exception if element is null and container does not allow nulls |
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if (! $this->optionAllowNullMembers() && is_null($element)) { |
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throw new \InvalidArgumentException( |
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'The ' . $this->containerInternalName() . ' does not allow null elements' |
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); |
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} |
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// always throw an exception if element is not the correct type |
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View Code Duplication |
if (! $this->checkElementType($element)) { |
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throw new \InvalidArgumentException( |
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'Invalid element type;' |
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. ' the ' . $this->containerInternalName() . ' ' . get_class($this) |
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. ' was expecting a ' . $this->getElementType() . ' type' |
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); |
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} |
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// return the error message, add will throw an exception, offer will return false |
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if ($this->optionUniqueValues() && $this->contains($element)) { |
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return 'The ' . $this->containerInternalName() . ' does not allow duplicated elements'; |
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} |
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// no error found |
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return ''; |
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} |
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View Code Duplication |
public function addFirst($element) |
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{ |
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if ('' !== $errorMessage = $this->checkAddOffer($element)) { |
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throw new \InvalidArgumentException($errorMessage); |
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} |
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$this->storage->unshift($element); |
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} |
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View Code Duplication |
public function addLast($element) |
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{ |
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if ('' !== $errorMessage = $this->checkAddOffer($element)) { |
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throw new \InvalidArgumentException($errorMessage); |
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} |
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$this->storage->push($element); |
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} |
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View Code Duplication |
public function offerFirst($element) |
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{ |
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if ('' !== $this->checkAddOffer($element)) { |
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return false; |
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} |
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$this->storage->unshift($element); |
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return true; |
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} |
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View Code Duplication |
public function offerLast($element) |
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{ |
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if ('' !== $this->checkAddOffer($element)) { |
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return false; |
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} |
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$this->storage->push($element); |
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return true; |
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} |
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public function getFirst() |
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{ |
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if ($this->isEmpty()) { |
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throw new \LogicException('Can not get an element from an empty ' . $this->containerInternalName()); |
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} |
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return $this->storage->bottom(); |
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} |
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public function peekFirst() |
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{ |
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if ($this->isEmpty()) { |
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return null; |
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} |
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return $this->storage->bottom(); |
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} |
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public function removeFirst() |
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{ |
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if ($this->isEmpty()) { |
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throw new \LogicException('Can not remove an element from an empty ' . $this->containerInternalName()); |
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} |
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return $this->storage->shift(); |
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} |
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public function pollFirst() |
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{ |
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if ($this->isEmpty()) { |
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return null; |
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} |
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return $this->storage->shift(); |
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} |
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public function contains($element) |
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{ |
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return $this->storage->contains($element); |
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} |
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protected function createStorageObject() |
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{ |
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$this->storage = new DoubleLinkedList(); |
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if (! $this->optionComparisonIsIdentical()) { |
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$this->storage->strictComparisonOff(); |
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} |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.