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<?php
/**
 * CExistValidator class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CExistValidator validates that the attribute value exists in a table.
 *
 * This validator is often used to verify that a foreign key contains a value
 * that can be found in the foreign table.
 *
 * When using the {@link message} property to define a custom error message, the message
 * may contain additional placeholders that will be replaced with the actual content. In addition
 * to the "{attribute}" placeholder, recognized by all validators (see {@link CValidator}),
 * CExistValidator allows for the following placeholders to be specified:
 * <ul>
 * <li>{value}: replaced with value of the attribute.</li>
 * </ul>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.validators
 */
class CExistValidator extends CValidator
{
	/**
	 * @var string the ActiveRecord class name that should be used to
	 * look for the attribute value being validated. Defaults to null,
	 * meaning using the ActiveRecord class of the attribute being validated.
	 * You may use path alias to reference a class name here.
	 * @see attributeName
	 */
	public $className;
	/**
	 * @var string the ActiveRecord class attribute name that should be
	 * used to look for the attribute value being validated. Defaults to null,
	 * meaning using the name of the attribute being validated.
	 * @see className
	 */
	public $attributeName;
	/**
	 * @var array additional query criteria. This will be combined with the condition
	 * that checks if the attribute value exists in the corresponding table column.
	 * This array will be used to instantiate a {@link CDbCriteria} object.
	 */
	public $criteria=array();
	/**
	 * @var boolean whether the attribute value can be null or empty. Defaults to true,
	 * meaning that if the attribute is empty, it is considered valid.
	 */
	public $allowEmpty=true;

	/**
	 * Validates the attribute of the object.
	 * If there is any error, the error message is added to the object.
	 * @param CModel $object the object being validated
	 * @param string $attribute the attribute being validated
	 */
	protected function validateAttribute($object,$attribute)
	{
		$value=$object->$attribute;
		if($this->allowEmpty && $this->isEmpty($value))
			return;

		$className=$this->className===null?get_class($object):Yii::import($this->className);
		$attributeName=$this->attributeName===null?$attribute:$this->attributeName;
		$finder=CActiveRecord::model($className);
		$table=$finder->getTableSchema();
		if(($column=$table->getColumn($attributeName))===null)
			throw new CException(Yii::t('yii','Table "{table}" does not have a column named "{column}".',
				array('{column}'=>$attributeName,'{table}'=>$table->name)));

		$criteria=array('condition'=>$column->rawName.'=:vp','params'=>array(':vp'=>$value));
		if($this->criteria!==array())
		{
			$criteria=new CDbCriteria($criteria);
			$criteria->mergeWith($this->criteria);
		}

		if(!$finder->exists($criteria))
		{
			$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} "{value}" is invalid.');
			$this->addError($object,$attribute,$message,array('{value}'=>$value));
		}
	}
}