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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: Evaluator.php 418 2010-10-18 21:40:08Z jonathanhawk $ |
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*/ |
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namespace Xyster\Data\Symbol; |
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/** |
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* An object that pulls the values out of an object or array given a field |
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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 Evaluator |
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{ |
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/** |
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* @var string |
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*/ |
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protected $_name; |
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|
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/** |
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* Creates a new field getter |
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* |
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* @param string $name The field name |
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*/ |
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public function __construct( $name ) |
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{ |
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if ( $name instanceof Field ) { |
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$name = $name->getName(); |
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} |
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$this->_name = (string)$name; |
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} |
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|
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/** |
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* Gets the named value out of an array or object |
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* |
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* @param mixed $object An array or object |
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* @return mixed |
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*/ |
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public function evaluate( $object ) |
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{ |
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$value = null; |
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if ( is_array($object) || $object instanceof \ArrayAccess ) { |
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if ( !isset($object[$this->_name]) && !array_key_exists($this->_name, $object) ) { |
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throw new InvalidArgumentException("Field name '{$this->_name}' is invalid"); |
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} |
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$value = $object[$this->_name]; |
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} else if ( is_object($object) && method_exists($object, 'get'.ucfirst($this->_name)) ) { |
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// JavaBean-style getter |
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$method = 'get'.ucfirst($this->_name); |
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$value = $object->$method(); |
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} else if ( is_object($object) && preg_match('/^[a-z_]\w*$/i', $this->_name) ) { |
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// name of a real property or one caught by __get() |
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$value = $object->{$this->_name}; |
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} else if ( is_object($object) ) { |
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// this is eval'ed becuse $this->_name might be a method call |
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// maybe sometime in the future we can do this better... |
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eval("\$value = \$object->{$this->_name};"); |
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} else { |
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throw new InvalidArgumentException("Only objects or arrays can be evaluated"); |
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} |
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return $value; |
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} |
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|
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/** |
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* A shortcut instead of creating a new getter |
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* |
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* @param mixed $object An array or object |
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* @param string $field The field name (or an object that will toString) |
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* @return mixed |
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*/ |
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static public function get( $object, $field ) |
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{ |
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if ( $object instanceof \Xyster\Data\Set && $field instanceof AggregateField ) { |
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return $object->aggregate($field); |
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} |
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|
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$getter = new self($field); |
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return $getter->evaluate($object); |
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} |
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} |
