<?php
/*
 *  $Id: UniqueValidator.php 536 2007-01-10 14:30:38Z heltem $
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information please see
 * <http://propel.phpdb.org>.
 */

require_once 'propel/validator/BasicValidator.php';

/**
 * A validator for unique column names.
 *
 * <code>
 *   <column name="username" type="VARCHAR" size="25" required="true" />
 *
 *   <validator column="username">
 *     <rule name="unique" message="Username already exists !" />
 *   </validator>
 * </code>
 *
 * @author     Michael Aichler <aichler@mediacluster.de>
 * @version    $Revision: 536 $
 * @package    propel.validator
 */
class UniqueValidator implements BasicValidator
{

	/**
	 * @see        BasicValidator::isValid()
	 */
	public function isValid (ValidatorMap $map, $str)
	{
	  $column = $map->getColumn();

	  $c = new Criteria();
	  $c->add($column->getFullyQualifiedName(), $str, Criteria::EQUAL);

	  $isValid = false;

	  try {

		  $table = $column->getTable()->getPhpName();
		  $cmd = sprintf('$isValid = %sPeer::doCount($c) == 0;', $table);
		  eval($cmd);

	  } catch(PropelException $e) {
		/* what to do here ? */
	  }

	  return $isValid;
	}
}
