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<?php |
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namespace Humweb\Features; |
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use Humweb\Features\Resolvers\StrategyResolver; |
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use Humweb\Features\Strategy\StrategyInterface; |
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/** |
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* StrategyCollection. |
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*/ |
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class StrategyCollection implements \ArrayAccess |
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{ |
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const STATUS_DISABLED = 0; |
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const STATUS_ENABLED = 1; |
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/** |
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* @var array |
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*/ |
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public $strategies; |
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protected $resolver; |
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protected $status = 1; |
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protected $threshold = 1; |
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/** |
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* @param array $strategies |
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*/ |
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public function __construct($strategies = array()) |
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{ |
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$this->resolver = new StrategyResolver(); |
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$this->strategies = $strategies; |
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} |
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/** |
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* Adds strategies to feature object. |
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* |
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* @param string|array $name |
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* @param callable|StrategyInterface|null $strategy |
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* |
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* @return $this |
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*/ |
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public function add($name, $strategy = null, $args = []) |
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{ |
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if (is_array($name)) { |
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$strategy = $name; |
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foreach ($strategy as $name => $class) { |
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$args = isset($class[1]) ? $class[1] : []; |
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$this->addStrategy($name, $class[0], $args); |
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} |
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} else { |
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$this->addStrategy($name, $strategy, $args); |
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} |
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return $this; |
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} |
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/** |
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* Adds strategy to feature object. |
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* |
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* @param string $name |
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* @param callable|StrategyInterface|null $class Strategy class name. |
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* @param array $args |
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* |
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* @return $this |
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* @throws InvalidArgumentException |
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*/ |
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public function addStrategy($name, $class = null, $args = []) |
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{ |
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if (is_callable($class)) { |
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$this->strategies[$name] = [ |
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'class' => $class, |
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'args' => $args, |
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'type' => 'function' |
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]; |
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} elseif ($class instanceof StrategyInterface) { |
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$this->strategies[$name] = [ |
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'class' => $class, |
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'args' => $args, |
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'type' => 'class_instance' |
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]; |
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} else { |
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// Strategy must be a string |
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if ( ! is_string($class)) { |
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throw new \InvalidArgumentException(sprintf('Expected a string. Actual: %s', gettype($class))); |
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} |
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$class = $this->resolver->resolve($class); |
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$this->strategies[$name] = [ |
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'class' => $class, |
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'args' => $args, |
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'type' => 'class' |
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]; |
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} |
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return $this; |
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} |
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public function count() |
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{ |
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return count($this->strategies); |
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} |
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public function flush() |
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{ |
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return $this->strategies = []; |
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} |
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/** |
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* @param array $args |
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* |
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* @return bool |
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*/ |
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public function check($args = []) |
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{ |
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if ($this->status === self::STATUS_DISABLED) { |
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return false; |
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} |
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$isEnabled = 0; |
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foreach ($this->strategies as $name => $strategy) { |
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if ($this->isAnonymousFunctionStrategy($strategy)) { |
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if ($strategy['class']($strategy['args'])) { |
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$isEnabled++; |
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} |
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} elseif ($this->callStrategyInstance($strategy, $args)) { |
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$isEnabled++; |
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} |
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} |
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return $isEnabled >= $this->threshold; |
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} |
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protected function callStrategyInstance($strategy, $args = []) |
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{ |
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if ($strategy['type'] == 'class_instance') { |
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$instance = $strategy['class']; |
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} else { |
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$instance = new $strategy['class']($args); |
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} |
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return $instance->handle($strategy['args']); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Whether a offset exists. |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetexists.php |
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* |
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* @param mixed $offset <p> |
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* An offset to check for. |
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* </p> |
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* |
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* @return bool true on success or false on failure. |
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* </p> |
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* <p> |
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* The return value will be casted to boolean if non-boolean was returned. |
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*/ |
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public function offsetExists($offset) |
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{ |
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return isset($this->strategies[$offset]) || isset($this->strategies['__'.$offset]); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Offset to retrieve. |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetget.php |
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* |
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* @param mixed $offset <p> |
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* The offset to retrieve. |
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* </p> |
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* |
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* @return mixed Can return all value types. |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->strategies[$offset]; |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Offset to set. |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetset.php |
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* |
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* @param mixed $offset <p> |
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* The offset to assign the value to. |
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* </p> |
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* @param mixed $value <p> |
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* The value to set. |
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* </p> |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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$this->add([$offset => $value]); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Offset to unset. |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetunset.php |
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* |
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* @param mixed $offset <p> |
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* The offset to unset. |
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* </p> |
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*/ |
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public function offsetUnset($offset) |
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{ |
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unset($this->strategies[$offset]); |
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} |
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public function off() |
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{ |
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$this->status = self::STATUS_DISABLED; |
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return $this; |
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} |
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public function on() |
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{ |
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$this->status = self::STATUS_ENABLED; |
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return $this; |
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} |
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public function getStatus() |
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{ |
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return $this->status; |
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} |
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/** |
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* @param int $threshold |
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* |
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* @return StrategyCollection |
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*/ |
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public function setThreshold($threshold) |
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{ |
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$this->threshold = $threshold; |
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return $this; |
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} |
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protected function isAnonymousFunctionStrategy($strategy = []) |
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{ |
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return $strategy['type'] === 'function'; |
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} |
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/** |
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* @return int |
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*/ |
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public function getThreshold() |
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{ |
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return $this->threshold; |
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} |
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/** |
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* @return array |
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*/ |
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public function getStrategies() |
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{ |
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return $this->strategies; |
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} |
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} |
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