--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Config\Definition\Builder;
+
+use Symfony\Component\Config\Definition\VariableNode;
+
+/**
+ * This class provides a fluent interface for defining a node.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class VariableNodeDefinition extends NodeDefinition
+{
+ /**
+ * Instantiate a Node.
+ *
+ * @return VariableNode The node
+ */
+ protected function instantiateNode()
+ {
+ return new VariableNode($this->name, $this->parent);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function createNode()
+ {
+ $node = $this->instantiateNode();
+
+ if (null !== $this->normalization) {
+ $node->setNormalizationClosures($this->normalization->before);
+ }
+
+ if (null !== $this->merge) {
+ $node->setAllowOverwrite($this->merge->allowOverwrite);
+ }
+
+ if (true === $this->default) {
+ $node->setDefaultValue($this->defaultValue);
+ }
+
+ $node->setAllowEmptyValue($this->allowEmptyValue);
+ $node->addEquivalentValue(null, $this->nullEquivalent);
+ $node->addEquivalentValue(true, $this->trueEquivalent);
+ $node->addEquivalentValue(false, $this->falseEquivalent);
+ $node->setRequired($this->required);
+
+ if (null !== $this->validation) {
+ $node->setFinalValidationClosures($this->validation->rules);
+ }
+
+ return $node;
+ }
+}