Added readonly validator

lib/Doctrine/Validator/Readonly.php

+<?php
+/*
+ * 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_Readonly
+ *
+ * @package     Doctrine
+ * @subpackage  Validator
+ * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link        www.phpdoctrine.com
+ * @author      Adam Huttler <ahuttler@geminisbs.com>
+ */
+class Doctrine_Validator_Readonly
+{
+    /**
+     * checks if value has been modified
+     *
+     * @param mixed $value
+     * @return boolean
+     */
+    public function validate($value)
+    {
+        $modified = $this->invoker->getModifed();
+        
+        return array_key_exists($this->field, $modified) ? false : true;
+    }
+}
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