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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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* @see Xyster_Data_Field |
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*/ |
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require_once 'Xyster/Data/Field.php'; |
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/** |
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* A field or column that has some aggregate function applied to it |
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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_Field_Aggregate extends Xyster_Data_Field |
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{ |
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/** |
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* The pattern to match aggregate function fields |
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* |
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*/ |
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const AGGREGATE_REGEX = '/^(?P<function>AVG|MAX|MIN|COUNT|SUM)\((?P<field>[\w\W]*)\)$/i'; |
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|
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/** |
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* @var Xyster_Data_Aggregate |
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*/ |
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protected $_function; |
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|
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/** |
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* Creates a new Aggregate Field |
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* |
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* @param Xyster_Data_Aggregate $function The aggregate function applied |
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* @param string $name The field name (be it a property, column, whatever) |
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* @param string $alias The alias for this field |
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*/ |
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protected function __construct( Xyster_Data_Aggregate $function, $name, $alias = null ) |
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{ |
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parent::__construct($name, $alias); |
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$this->_function = $function; |
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} |
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|
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/** |
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* Evaluates the reference for the given object |
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* |
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* @param mixed $object |
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* @return mixed |
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*/ |
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public function evaluate( $object ) |
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{ |
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return ( $object instanceof Xyster_Data_Set ) ? |
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$object->aggregate($this) : parent::evaluate($object); |
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} |
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|
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/** |
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* Gets the aggregate function associated with this field |
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* |
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* @return Xyster_Data_Aggregate The assigned aggregate function |
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*/ |
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public function getFunction() |
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{ |
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return $this->_function; |
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} |
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|
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/** |
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* String representation of this object |
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* |
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* @magic |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return $this->_function->getValue() . '(' . parent::__toString() . ')'; |
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} |
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|
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/** |
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* Matches for aggregate functions |
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* |
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* @param string $haystack |
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* @return array |
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*/ |
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static public function match( $haystack ) |
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{ |
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$matches = array(); |
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preg_match(self::AGGREGATE_REGEX, trim($haystack), $matches); |
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return $matches; |
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} |
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} |
