<?php

/*
FileArts
Copyright (C) 2007 Peter Goodman, Geoffrey Goodman

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

//
// Abstract Classes
//

class FACriteria {
	function getFailureMessage() {
		assert(FALSE);
	}
	
	function validate(&$table, &$dispatcher) {
		assert(FALSE);
	}
}

//
// Concrete Classes
//

class FALambdaCriteria extends FACriteria {
	var $_field;
	var $_lambda;
	var $_message;
	
	function FALambdaCriteria($field, $lambda, $message) {
		assert(function_exists($lambda));
		
		$this->_field = $field;
		$this->_lambda = $lambda;
		$this->_message = $message;
	}
	
	function getFailureMessage() {
		return $this->_message;
	}
	
	function getFields() {
		return array($this->_field);
	}
	
	function validate(&$table, &$dispatcher) {
		$value = $table->get($this->_field); //NOTE: This is a by copy on purpose
		
		if (!call_user_func($this->_lambda, $value)) {
			$dispatcher->notifyAll(new FAFailedCriteriaEvent($this));
		}
	}
}

class FANumericCriteria extends FALambdaCriteria {
	function FANumericCriteria($field, $message) {
		parent::construct($field, 'is_numeric', $message);
	}
}

class FACompareCriteria extends FACriteria {
	var $_field1;
	var $_field2;
	var $_message;
	
	function FACompareCriteria($field1, $field2, $message) {
		$this->_field1 = $field1;
		$this->_field2 = $field2;
		$this->_message = $message;
	}
	
	function getFailureMessage() {
		return $this->_message;
	}
	
	function getFields() {
		return array($this->_field1, $this->_field2);
	}
	
	function validate(&$table, &$dispatcher) {
		if ((string)$table->get($this->_field1) !== (string)$table->get($this->_field2)) {
			$dispatcher->notifyAll(new FAFailedCriteriaEvent($this));
		}
	}
}

?>