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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_Data |
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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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* Xyster_Collection_Comparator_Interface |
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*/ |
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require_once 'Xyster/Collection/Comparator/Interface.php'; |
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/** |
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* Comparator for objects or associative arrays |
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* |
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* @category Xyster |
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* @package Xyster_Data |
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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_Data_Comparator implements Xyster_Collection_Comparator_Interface |
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{ |
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/** |
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* The array of {@link Xyster_Data_Sort} objects |
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* |
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* @var array |
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*/ |
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protected $_sorts = array(); |
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|
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/** |
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* Create a new Data Comparator object |
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* |
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* @param array $sort An array of {@link Xyster_Data_Sort} objects |
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*/ |
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public function __construct( array $sorts ) |
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{ |
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foreach( $sorts as $sort ) { |
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if ( ! $sort instanceof Xyster_Data_Sort ) { |
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require_once 'Xyster/Data/Exception.php'; |
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throw new Xyster_Data_Exception('Only Xyster_Data_Sort objects can be used'); |
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} |
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$this->_sorts[] = $sort; |
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} |
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} |
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|
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/** |
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* Compares two arguments for sorting |
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* |
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* Returns a negative integer, zero, or a positive integer as the first |
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* argument is less than, equal to, or greater than the second. |
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* |
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* @param mixed $a |
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* @param mixed $b |
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*/ |
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public function compare( $a, $b ) |
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{ |
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foreach( $this->_sorts as $sort ) { |
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$av = $sort->getField()->evaluate($a); |
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$bv = $sort->getField()->evaluate($b); |
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if ( $av < $bv ) { |
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return ( $sort->getDirection() == 'ASC' ) ? -1 : 1; |
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} else if ( $av > $bv ) { |
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return ( $sort->getDirection() == 'ASC' ) ? 1 : -1; |
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} |
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} |
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return 0; |
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} |
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} |
