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<?php |
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namespace Itstructure\GridView\Columns; |
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use Exception; |
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use Itstructure\GridView\Filters\{BaseFilter, StubFilter, TextFilter}; |
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use Itstructure\GridView\Formatters\{HtmlFormatter, ImageFormatter, TextFormatter, UrlFormatter}; |
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use Itstructure\GridView\Interfaces\Formattable; |
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use Itstructure\GridView\Traits\{Configurable, Attributable}; |
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/** |
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* Class BaseColumn |
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* @package Itstructure\GridView\Columns |
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*/ |
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abstract class BaseColumn |
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{ |
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use Configurable, Attributable; |
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const |
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FORMATTER_HTML = 'html', |
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FORMATTER_IMAGE = 'image', |
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FORMATTER_TEXT = 'text', |
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FORMATTER_URL = 'url', |
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FORMATTER_DEFINITIONS = [ |
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self::FORMATTER_HTML => HtmlFormatter::class, |
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self::FORMATTER_IMAGE => ImageFormatter::class, |
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self::FORMATTER_TEXT => TextFormatter::class, |
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self::FORMATTER_URL => UrlFormatter::class, |
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]; |
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/** |
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* @var string |
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*/ |
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protected $label; |
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/** |
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* @var string |
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*/ |
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protected $attribute; |
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/** |
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* @var bool|null|string |
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*/ |
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protected $sort; |
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/** |
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* @var string $value |
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*/ |
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protected $value; |
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/** |
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* @var bool|null|string|BaseFilter |
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*/ |
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protected $filter; |
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/** |
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* @var string|Formattable |
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*/ |
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protected $format; |
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/** |
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* BaseColumn constructor. |
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* @param array $config |
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*/ |
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public function __construct(array $config) |
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{ |
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$this->loadConfig($config); |
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$this->buildFilter(); |
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$this->buildFormatter(); |
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} |
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/** |
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* @param $row |
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* @return mixed |
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*/ |
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public function getValue($row) |
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{ |
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} |
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/** |
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* Render row attribute value. |
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* @param $row |
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* @return mixed |
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*/ |
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public function render($row) |
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{ |
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return $this->formatTo($this->getValue($row)); |
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} |
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/** |
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* Format value with formatter. |
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* @param $value |
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* @return mixed |
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*/ |
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public function formatTo($value) |
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{ |
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return $this->format->format($value); |
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} |
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/** |
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* Get title for grid head. |
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* @return string |
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*/ |
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public function getLabel(): string |
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{ |
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return $this->label ?? ucfirst($this->attribute); |
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} |
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/** |
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* Get attribute. |
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* @return string|null |
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*/ |
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public function getAttribute() |
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{ |
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return $this->attribute; |
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} |
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/** |
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* @return bool|null|string |
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*/ |
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public function getSort() |
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{ |
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if (is_null($this->sort) || $this->sort === true) { |
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return is_null($this->attribute) ? false : $this->attribute; |
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} |
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return $this->sort; |
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} |
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/** |
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* @return BaseFilter |
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*/ |
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public function getFilter() |
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{ |
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return $this->filter; |
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} |
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/** |
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* @param BaseFilter $filter |
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*/ |
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protected function setFilter(BaseFilter $filter): void |
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{ |
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$this->filter = $filter; |
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} |
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/** |
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* @return void |
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*/ |
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protected function buildFilter(): void |
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{ |
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if ($this->filter === false) { |
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$this->filter = new StubFilter(); |
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} else if (is_null($this->filter)) { |
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$this->filter = new TextFilter([ |
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'name' => $this->getAttribute(), |
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]); |
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} else if (is_array($this->filter)) { |
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if (isset($this->filter['class']) && class_exists($this->filter['class'])) { |
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$this->setFilter( |
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new $this->filter['class'](array_merge($this->filter, empty($this->filter['name']) ? [ |
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'name' => $this->getAttribute() |
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] : []) |
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) |
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); |
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} |
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} |
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} |
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/** |
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* @param Formattable $formatter |
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*/ |
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protected function setFormatter(Formattable $formatter): void |
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{ |
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$this->format = $formatter; |
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} |
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/** |
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* @throws Exception |
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* @return void |
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*/ |
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protected function buildFormatter(): void |
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{ |
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if (is_null($this->format)) { |
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$class = self::FORMATTER_DEFINITIONS[self::FORMATTER_TEXT]; |
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$this->format = new $class; |
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} else if (is_string($this->format)) { |
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$class = self::FORMATTER_DEFINITIONS[$this->format] ?? self::FORMATTER_DEFINITIONS[self::FORMATTER_TEXT]; |
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$this->format = new $class; |
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} else if (is_array($this->format)) { |
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if (isset($this->format['class']) && class_exists($this->format['class'])) { |
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$this->setFormatter(new $this->format['class']($this->format)); |
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} |
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} else if (!is_object($this->format) || !($this->format instanceof Formattable)) { |
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throw new Exception('Incorrect formatter.'); |
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} |
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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.