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<?php |
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/* |
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* This file is part of the ClassGeneration package. |
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* |
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* (c) Antonio Spinelli <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace ClassGeneration; |
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use ClassGeneration\Collection\ArrayCollection; |
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use ClassGeneration\Composition\MethodCollection as CompositionMethodCollection; |
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use ClassGeneration\Composition\MethodInterface as CompositionMethodInterface; |
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use ClassGeneration\Element\Tabbable; |
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/** |
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* Property Collection ClassGeneration |
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* @author Antonio Spinelli <[email protected]> |
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*/ |
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class CompositionCollection extends ArrayCollection implements Tabbable |
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{ |
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/** |
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* Tabulation Identity. |
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* @var int |
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*/ |
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protected $tabulation; |
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/** |
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* @var CompositionMethodCollection |
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*/ |
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protected $methods; |
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/** |
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* Initializes a new ArrayCollection. |
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* |
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* @param array $elements |
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*/ |
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public function __construct(array $elements = array()) |
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{ |
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$this->setTabulation(4); |
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$this->elements = $elements; |
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$this->methods = new CompositionMethodCollection(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getTabulation() |
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{ |
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return $this->tabulation; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getTabulationFormatted() |
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{ |
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return str_repeat(' ', $this->getTabulation()); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function setTabulation($tabulation) |
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{ |
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$this->tabulation = (int)$tabulation; |
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return $this; |
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} |
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/** |
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* Adds a new Composition at CompositionCollection. |
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* |
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* @param string $composition |
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* |
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* @return bool |
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*/ |
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public function add($composition) |
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{ |
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if(!$this->contains($composition)){ |
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parent::add($composition); |
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} |
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return true; |
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} |
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/** |
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* @param CompositionMethodInterface $method |
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* @return bool |
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*/ |
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public function addMethod(CompositionMethodInterface $method) |
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{ |
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$this->addComposition($method->getTraitName()); |
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return $this->getMethods()->add($method); |
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} |
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/** |
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* @return CompositionMethodCollection |
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*/ |
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public function getMethods() |
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{ |
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return $this->methods; |
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} |
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/** |
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* @param CompositionMethodCollection $methods |
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* @return CompositionCollection |
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*/ |
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public function setMethods(CompositionMethodCollection $methods) |
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{ |
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$this->methods = $methods; |
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return $this; |
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} |
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/** |
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* @param string $composition |
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* @return bool |
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*/ |
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public function addComposition($composition) |
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{ |
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return $this->add($composition); |
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} |
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/** |
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* Parse the Composition Collection to string. |
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* @return string |
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*/ |
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public function toString() |
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{ |
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if ($this->isEmpty()) { |
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return ''; |
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} |
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$traitNames = $this->toArray(); |
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$tabulationFormatted = $this->getTabulationFormatted(); |
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$compositionMethods = ';' . PHP_EOL; |
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if (!$this->getMethods()->isEmpty()) { |
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$compositionMethods = ' ' . $this->getMethods()->toString(); |
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} |
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return $tabulationFormatted . 'use ' . implode(', ', $traitNames) . $compositionMethods; |
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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.