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<?php |
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/** |
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* apparat-dev |
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* |
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* @category Apparat |
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* @package Apparat\Server |
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* @subpackage Apparat\Dev\Application\Service |
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* @author Joschi Kuphal <[email protected]> / @jkphl |
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* @copyright Copyright © 2016 Joschi Kuphal <[email protected]> / @jkphl |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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*/ |
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/*********************************************************************************** |
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* The MIT License (MIT) |
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* |
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* Copyright © 2016 Joschi Kuphal <[email protected]> / @jkphl |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
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* the Software, and to permit persons to whom the Software is furnished to do so, |
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* subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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***********************************************************************************/ |
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namespace Apparat\Dev\Application\Service; |
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use Apparat\Dev\Ports\Repository; |
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/** |
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* Repository iterator |
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* |
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* @package Apparat\Dev |
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* @subpackage Apparat\Dev\Application |
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*/ |
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class RepositoryIterator implements RepositoryIteratorInterface |
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{ |
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/** |
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* Object configuration |
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* |
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* @var array |
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*/ |
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protected $config; |
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/** |
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* Object stac |
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* |
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* @var array |
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*/ |
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protected $objectStack = []; |
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/** |
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* Day pointer |
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* |
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* @var \DateTime |
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*/ |
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protected $dayPointer; |
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/** |
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* Constructor |
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* |
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* @param array $config Object configuration |
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*/ |
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public function __construct(array $config) |
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{ |
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$this->config = $config; |
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} |
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/** |
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* Return the current object config |
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* |
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* @return array Object config |
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*/ |
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public function current() |
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{ |
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return $this->config[array_shift($this->objectStack)]; |
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} |
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/** |
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* Forward the day pointer by a random period between 0 and 259200 seconds (= 3 days) |
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*/ |
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public function next() |
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{ |
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$this->dayPointer->add(new \DateInterval('PT'.rand(0, 259200).'S')); |
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} |
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/** |
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* Return the day pointer |
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* |
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* @return \DateTime Day pointer |
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*/ |
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public function key() |
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{ |
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return $this->dayPointer; |
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} |
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public function valid() |
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{ |
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return count($this->objectStack) > 0; |
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} |
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/** |
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* Rewind the iterator and rebuild the object stack |
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*/ |
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public function rewind() |
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{ |
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// Recreate a random object stack |
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$this->objectStack = []; |
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foreach ($this->config as $objectType => $objectConfig) { |
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$this->objectStack = array_pad( |
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$this->objectStack, |
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count($this->objectStack) + $objectConfig[Repository::COUNT], |
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$objectType |
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); |
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} |
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shuffle($this->objectStack); |
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// Reset the day pointer |
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$this->dayPointer = new \DateTime(); |
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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_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.