Added validator for unsigned data types

Ticket: 288

lib/Doctrine/Compiler.php

@@ -221,6 +221,7 @@ class Doctrine_Compiler
                                    'Validator_Range',
                                    'Validator_Regexp',
                                    'Validator_Unique',
+                                   'Validator_Unsigned',
                                    'Validator_Usstate',
                                    'ValueHolder',
                                    'View_Exception',

lib/Doctrine/Validator/Unsigned.php

@@ -0,0 +1,54 @@
+<?php
+/*
+ *  $Id: Enum.php 1080 2007-02-10 18:17:08Z romanb $
+ *
+ * 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, see
+ * <http://www.phpdoctrine.com>.
+ */
+
+/**
+ * Doctrine_Validator_Enum
+ *
+ * @package     Doctrine
+ * @category    Object Relational Mapping
+ * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link        www.phpdoctrine.com
+ * @since       1.0
+ * @version     $Revision: 1080 $
+ * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
+ */
+class Doctrine_Validator_Unsigned
+{
+    /**
+     * @param Doctrine_Record $record
+     * @param string $key
+     * @param mixed $value
+     * @param string $args
+     * @return boolean
+     */
+    public function validate(Doctrine_Record $record, $key, $value, $args)
+    {
+        $int = (int) $value;
+
+        if ($int != $value || $int < 0) {
+            return false;
+        }
+        if ($int < 0) {
+            return false;
+        }
+        return true;
+    }
+}