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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 LibreWorks, LLC (http://libreworks.net) |
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* @license http://www.opensource.org/licenses/bsd-license.php New BSD License |
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* @version $Id$ |
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*/ |
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namespace Xyster\Data; |
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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 LibreWorks, LLC (http://libreworks.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 Comparator implements \Xyster\Collection\IComparator |
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{ |
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/** |
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* The clause of {@link Symbol\Sort} objects |
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* |
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* @var Symbol\SortClause |
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*/ |
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protected $_sorts; |
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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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* If you pass a clause containing no objects, this comparator will always |
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* return zero when comparing objects. |
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* |
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* @param Symbol\SortClause $sorts A clause of sort objects |
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*/ |
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public function __construct(Symbol\SortClause $sorts) |
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{ |
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$this->_sorts = $sorts; |
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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 $sort) { |
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$getter = new Symbol\Evaluator($sort->getField()); |
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$av = $getter->evaluate($a); |
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$bv = $getter->evaluate($b); |
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if ($av < $bv) { |
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return ( $sort->isAscending() ) ? -1 : 1; |
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} else if ($av > $bv) { |
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return ( $sort->isAscending() ) ? 1 : -1; |
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} |
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} |
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return 0; |
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} |
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} |
