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<?php
/**
* CUniqueValidator 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/
*/

/**
* CUniqueValidator validates that the attribute value is unique in the corresponding database 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}),
* CUniqueValidator allows for the following placeholders to be specified:
* <ul>
* <li>{value}: replaced with current value of the attribute.</li>
* </ul>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.validators
* @since 1.0
*/
class CUniqueValidator extends CValidator
{
/**
* @var boolean whether the comparison is case sensitive. Defaults to true.
* Note, by setting it to false, you are assuming the attribute type is string.
*/
public $caseSensitive=true;
/**
* @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;
/**
* @var string the ActiveRecord class name that should be used to
* look for the attribute value being validated. Defaults to null, meaning using
* the class of the object currently 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 mixed additional query criteria. Either an array or CDbCriteria.
* 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 string the user-defined error message. The placeholders "{attribute}" and "{value}"
* are recognized, which will be replaced with the actual attribute name and value, respectively.
*/
public $message;
/**
* @var boolean whether this validation rule should be skipped if when there is already a validation
* error for the current attribute. Defaults to true.
* @since 1.1.1
*/
public $skipOnError=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)));

$columnName=$column->rawName;
$criteria=new CDbCriteria();
if($this->criteria!==array())
$criteria->mergeWith($this->criteria);
$tableAlias = empty($criteria->alias) ? $finder->getTableAlias(true) : $criteria->alias;
$valueParamName = CDbCriteria::PARAM_PREFIX.CDbCriteria::$paramCount++;
$criteria->addCondition($this->caseSensitive ? "{$tableAlias}.{$columnName}={$valueParamName}" : "LOWER({$tableAlias}.{$columnName})=LOWER({$valueParamName})");
$criteria->params[$valueParamName] = $value;

if(!$object instanceof CActiveRecord || $object->isNewRecord || $object->tableName()!==$finder->tableName())
$exists=$finder->exists($criteria);
else
{
$criteria->limit=2;
$objects=$finder->findAll($criteria);
$n=count($objects);
if($n===1)
{
if($column->isPrimaryKey) // primary key is modified and not unique
$exists=$object->getOldPrimaryKey()!=$object->getPrimaryKey();
else
{
// non-primary key, need to exclude the current record based on PK
$exists=array_shift($objects)->getPrimaryKey()!=$object->getOldPrimaryKey();
}
}
else
$exists=$n>1;
}

if($exists)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} "{value}" has already been taken.');
$this->addError($object,$attribute,$message,array('{value}'=>CHtml::encode($value)));
}
}
}

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