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<?php |
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namespace TheCodingMachine\LazyArray; |
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class LazyArray implements \ArrayAccess |
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{ |
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/** |
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* The array with lazy values |
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* @var array |
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*/ |
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private $lazyArray; |
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/** |
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* The array with constructed values |
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* @var array |
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*/ |
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private $constructedArray = []; |
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/** |
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* @param array $lazyArray The array with lazy values |
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*/ |
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public function __construct(array $lazyArray = []) |
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{ |
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$this->lazyArray = $lazyArray; |
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} |
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/** |
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* @param string|object $className The FQCN or the instance to put in the array |
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* @param array ...$params The parameters passed to the constructor. |
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* @return int The key in the array |
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*/ |
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public function push($className, ...$params) { |
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if (is_object($className)) { |
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$this->lazyArray[] = $className; |
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} else { |
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$this->lazyArray[] = [ $className, $params ]; |
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} |
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end($this->lazyArray); |
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return key($this->lazyArray); |
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} |
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/** |
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* Whether a offset exists |
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* @link http://php.net/manual/en/arrayaccess.offsetexists.php |
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* @param mixed $offset <p> |
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* An offset to check for. |
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* </p> |
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* @return boolean true on success or false on failure. |
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* </p> |
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* <p> |
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* The return value will be casted to boolean if non-boolean was returned. |
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* @since 5.0.0 |
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*/ |
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public function offsetExists($offset) |
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{ |
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return isset($this->lazyArray[$offset]); |
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} |
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/** |
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* Offset to retrieve |
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* @link http://php.net/manual/en/arrayaccess.offsetget.php |
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* @param mixed $offset <p> |
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* The offset to retrieve. |
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* </p> |
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* @return mixed Can return all value types. |
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* @since 5.0.0 |
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*/ |
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public function offsetGet($offset) |
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{ |
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if (isset($this->constructedArray[$offset])) { |
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return $this->constructedArray[$offset]; |
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} else { |
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$item = $this->lazyArray[$offset]; |
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if (is_array($item)) { |
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$className = $item[0]; |
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$params = isset($item[1]) ? $item[1] : []; |
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} else { |
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$className = $item; |
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$params = []; |
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} |
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$this->constructedArray[$offset] = new $className(...$params); |
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return $this->constructedArray[$offset]; |
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} |
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} |
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/** |
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* Offset to set |
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* @link http://php.net/manual/en/arrayaccess.offsetset.php |
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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 $value <p> |
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* The value to set. |
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* </p> |
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* @return void |
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* @since 5.0.0 |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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throw new \LogicException('Not implemented yet'); |
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} |
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/** |
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* Offset to unset |
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* @link http://php.net/manual/en/arrayaccess.offsetunset.php |
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* @param mixed $offset <p> |
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* The offset to unset. |
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* </p> |
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* @return void |
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* @since 5.0.0 |
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*/ |
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public function offsetUnset($offset) |
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{ |
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unset($this->lazyArray[$offset]); |
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unset($this->constructedArray[$offset]); |
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} |
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} |
thecodingmachine /
lazy-array
