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<?php |
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/** |
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* Xyster Framework |
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* |
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* This source file is subject to the new BSD license that is bundled |
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* with this package in the file LICENSE.txt. |
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* It is also available through the world-wide-web at this URL: |
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* http://www.opensource.org/licenses/bsd-license.php |
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* |
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* @category Xyster |
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* @package Xyster_Collection |
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* @copyright Copyright (c) 2007-2008 Irrational Logic (http://irrationallogic.net) |
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* @license http://www.opensource.org/licenses/bsd-license.php New BSD License |
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*/ |
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/** |
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* Iterator for collections |
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* |
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* @category Xyster |
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* @package Xyster_Collection |
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* @copyright Copyright (c) 2007-2008 Irrational Logic (http://irrationallogic.net) |
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* @license http://www.opensource.org/licenses/bsd-license.php New BSD License |
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*/ |
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class Xyster_Collection_Iterator implements SeekableIterator, Countable |
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{ |
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/** |
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* The array over which to iterate |
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* |
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* @var array |
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*/ |
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protected $_items; |
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|
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/** |
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* Creates a new iterator |
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* |
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* @param array $list An array to iterate |
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*/ |
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public function __construct( array $list ) |
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{ |
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$this->_items = $list; |
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} |
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|
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/** |
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* Counts the number of elements |
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* |
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* @return int Number of elements in collection |
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*/ |
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public function count() |
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{ |
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return count($this->_items); |
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} |
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|
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/** |
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* Return the current element |
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* |
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* @return mixed The current element |
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*/ |
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public function current() |
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{ |
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return current($this->_items); |
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} |
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|
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/** |
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* Return the key of the current element |
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* |
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* @return mixed Key of the current element |
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*/ |
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public function key() |
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{ |
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return key($this->_items); |
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} |
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|
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/** |
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* Move pointer forward to next element |
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* |
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*/ |
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public function next() |
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{ |
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next($this->_items); |
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} |
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|
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/** |
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* Rewind the pointer to the first element |
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* |
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*/ |
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public function rewind() |
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{ |
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reset($this->_items); |
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} |
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|
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/** |
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* Check if there is a current element after calls to rewind() or next() |
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* |
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* @return boolean |
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*/ |
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public function valid() |
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{ |
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return ( $this->current() !== false ); |
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} |
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|
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/** |
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* Seek to an absolute position. |
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* |
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* @param int $index Position to seek |
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* @throws Xyster_Collection_Exception if the seek position is not found |
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*/ |
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public function seek( $index ) |
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{ |
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$this->rewind(); |
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$position = 0; |
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while( $position < $index && $this->valid() ) { |
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$this->next(); |
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$position++; |
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} |
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if ( !$this->valid() ) { |
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require_once 'Xyster/Collection/Exception.php'; |
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throw new Xyster_Collection_Exception('Out of bounds'); |
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} |
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} |
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} |
