119 lines
1.8 KiB
PHP
119 lines
1.8 KiB
PHP
<?php
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namespace Modules\Core\Option;
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use RuntimeException;
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use Exception;
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use EmptyIterator;
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/**
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* @extends Option<mixed>
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*/
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final class None extends Option
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{
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/** @var None|null */
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private static $instance;
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/** @return None */
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public static function create(): self
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{
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if (null === self::$instance) {
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self::$instance = new self();
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}
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return self::$instance;
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}
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public function get()
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{
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throw new RuntimeException("None has no value.");
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}
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public function getOrCall($callable)
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{
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return $callable();
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}
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public function getOrElse($default)
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{
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return $default;
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}
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public function getOrThrow(Exception $ex)
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{
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throw $ex;
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}
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public function isEmpty(): bool
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{
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return true;
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}
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public function isDefined(): bool
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{
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return false;
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}
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public function orElse(Option $else)
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{
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return $else;
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}
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public function ifDefined($callable)
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{
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// no-op
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}
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public function forAll($callable)
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{
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return $this;
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}
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public function map($callable)
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{
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return $this;
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}
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public function flatMap($callable)
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{
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return $this;
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}
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public function filter($callable)
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{
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return $this;
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}
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public function filterNot($callable)
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{
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return $this;
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}
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public function select($value)
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{
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return $this;
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}
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public function reject($value)
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{
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return $this;
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}
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public function getIterator(): EmptyIterator
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{
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return new EmptyIterator();
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}
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public function foldLeft($initialValue, $callable)
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{
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return $initialValue;
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}
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public function foldRight($initialValue, $callable)
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{
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return $initialValue;
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}
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private function __construct() {}
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}
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