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<?php |
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/** |
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* \AppserverIo\Collections\ArrayList |
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* |
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* NOTICE OF LICENSE |
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* |
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* This source file is subject to the Open Software License (OSL 3.0) |
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* that is available through the world-wide-web at this URL: |
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* http://opensource.org/licenses/osl-3.0.php |
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* |
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* PHP version 5 |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2015 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/appserver-io/collections |
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* @link http://www.appserver.io |
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*/ |
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namespace AppserverIo\Collections; |
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use AppserverIo\Lang\ClassCastException; |
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use AppserverIo\Lang\NullPointerException; |
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/** |
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* This class is the implementation of a ArrayList. |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2015 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/appserver-io/collections |
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* @link http://www.appserver.io |
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*/ |
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class ArrayList extends AbstractCollection |
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{ |
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/** |
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* Holds the internal counter for the keys of the ArrayList. |
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* |
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* @var integer |
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*/ |
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protected $count = 0; |
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/** |
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* Standard constructor that adds the array passed |
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* as parameter to the internal member variable. |
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* |
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* @param array $items An array to initialize the ArrayList |
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* |
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* @throws \AppserverIo\Lang\ClassCastException |
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*/ |
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public function __construct($items = null) |
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{ |
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// parent constructor to ensure property preset |
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parent::__construct(); |
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$this->count = 0; |
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// check if NULL is passed, is yes, to nothing |
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if (is_null($items)) { |
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return; |
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} |
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// check if an array is passed |
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if (is_array($items)) { |
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// initialize the ArrayList with the values of the passed array |
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foreach ($items as $item) { |
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$this->add($item); |
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} |
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return; |
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} |
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// if not a array is passed throw an exception |
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throw new ClassCastException('Passed object is not an array'); |
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} |
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/** |
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* This method adds the passed object with the passed key |
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* to the ArrayList. |
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* |
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* @param mixed $object The object that should be added to the ArrayList |
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* |
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* @return \AppserverIo\Collections\ArrayList The instance |
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* @throws \AppserverIo\Lang\NullPointerException Is thrown it the passed object is NULL |
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*/ |
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public function add($object) |
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{ |
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if (is_null($object)) { |
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throw new NullPointerException('Passed object is null'); |
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} |
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// set the item in the array |
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$this->items[$this->count ++] = $object; |
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// return the instance |
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return $this; |
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} |
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/** |
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* This method Returns a new ArrayList initialized with the |
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* passed array. |
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* |
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* @param array $array Holds the array to initialize the new ArrayList |
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* |
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* @return \AppserverIo\Collections\ArrayList Returns an ArrayList initialized with the passed array |
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* @throws \AppserverIo\Lang\ClassCastException Is thrown if the passed object is not an array |
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*/ |
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public static function fromArray($array) |
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{ |
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// check if the passed object is an array and set it |
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if (is_array($array)) { |
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return new ArrayList($array); |
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} |
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// throw an exception if the passed object is not an array |
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throw new ClassCastException('Passed object is not an array'); |
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} |
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/** |
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* This method returns a new ArrayList with the |
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* items from the passed offset with the passed |
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* length. |
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* |
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* If no length is passed, the section up from |
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* the offset until the end of the items is |
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* returned. |
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* |
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* @param integer $offset The start of the section |
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* @param integer $length The length of the section to return |
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* |
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* @return \AppserverIo\Collections\ArrayList Holds the ArrayList with the requested elements |
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*/ |
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public function slice($offset, $length = null) |
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{ |
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// initialize the items |
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$items = array(); |
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// if lenght is not define return all items from the offset up |
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// till the end of the items, else return all items from the offset |
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// with the defined length |
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if ($length == null) { |
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$items = array_slice($this->items, $offset); |
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} else { |
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$items = array_slice($this->items, $offset, $length); |
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} |
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// return a new ArraList with the requested items |
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return new ArrayList($items); |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.