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<?php |
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namespace Http\Discovery; |
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/** |
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* Registry that based find results on class existence. |
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* |
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* @author David de Boer <[email protected]> |
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*/ |
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abstract class ClassDiscovery |
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{ |
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/** |
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* Add a class (and condition) to the discovery registry. |
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* |
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* @param string $class Class that will be instantiated if found |
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* @param string $condition Optional other class to check for existence |
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*/ |
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public static function register($class, $condition = null) |
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{ |
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static::$cache = null; |
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$definition = [ |
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'class' => $class, |
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'condition' => isset($condition) ? $condition : $class, |
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]; |
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array_unshift(static::$classes, $definition); |
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} |
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/** |
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* Finds a Class. |
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* |
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* @return object |
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* |
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* @throws NotFoundException |
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*/ |
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public static function find() |
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{ |
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// We have a cache |
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if (isset(static::$cache)) { |
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return new static::$cache(); |
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} |
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foreach (static::$classes as $name => $definition) { |
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if (static::evaluateCondition($definition['condition'])) { |
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static::$cache = $definition['class']; |
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return new $definition['class'](); |
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} |
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} |
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throw new NotFoundException('Not found'); |
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} |
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/** |
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* Evaulates conditions to boolean. |
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* |
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* @param mixed $condition |
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* |
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* @return bool |
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*/ |
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protected static function evaluateCondition($condition) |
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{ |
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if (is_string($condition)) { |
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// Should be extended for functions, extensions??? |
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return class_exists($condition); |
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} elseif (is_callable($condition)) { |
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return $condition(); |
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} elseif (is_bool($condition)) { |
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return $condition; |
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} elseif (is_array($condition)) { |
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$evaluatedCondition = true; |
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1 |
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// Immediately stop execution if the condition is false |
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for ($i = 0; $i < count($condition) && false !== $evaluatedCondition; ++$i) { |
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$evaluatedCondition &= static::evaluateCondition($condition[$i]); |
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} |
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return $evaluatedCondition; |
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} |
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return false; |
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} |
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} |
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php-http /
discovery
