Add new interface.

src/MetaModels/Attribute/IAliasAware.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * This file is part of MetaModels/core.
+ *
+ * (c) 2012-2015 The MetaModels team.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * This project is provided in good faith and hope to be usable by anyone.
+ *
+ * @package    MetaModels
+ * @subpackage Core
+ * @author     Christian Schiffler <c.schiffler@cyberspectrum.de>
+ * @author     Stefan Heimes <stefan_heimes@hotmail.com>
+ * @copyright  2012-2015 The MetaModels team.
+ * @license    https://github.com/MetaModels/core/blob/master/LICENSE LGPL-3.0
+ * @filesource
+ */
+
+namespace MetaModels\Attribute;
+
+/**
+ * This interface allows to identify attributes which have a alias value like the select and tag attribute. So other
+ * attribute can use this alias values.
+ */
+interface IAliasAware
+{
+    /**
+     * Return the value of the alias.
+     *
+     * @return string
+     */
+    public function getAliasValue();
+
+    /**
+     * Check if the alias field is a metamodels attribute. If so we can handel it with some more options.
+     *
+     * @return bool True means we have a MetaModels attribute.
+     */
+    public function isAliasMetaModels();
+
+    /**
+     * If the alias is a MetaModels alias parse it.
+     *
+     * @param string $format The format for the parsing.
+     *
+     * @return string The parsed string or as fallback the getAliasValue.
+     */
+    public function parseAliasValue($format = 'text');
+}