--- /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;
+
+use Symfony\Component\Config\Definition\Exception\InvalidTypeException;
+
+/**
+ * This node represents a Boolean value in the config tree.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class BooleanNode extends ScalarNode
+{
+ /**
+ * {@inheritdoc}
+ */
+ protected function validateType($value)
+ {
+ if (!is_bool($value)) {
+ $ex = new InvalidTypeException(sprintf(
+ 'Invalid type for path "%s". Expected boolean, but got %s.',
+ $this->getPath(),
+ gettype($value)
+ ));
+ if ($hint = $this->getInfo()) {
+ $ex->addHint($hint);
+ }
+ $ex->setPath($this->getPath());
+
+ throw $ex;
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function isValueEmpty($value)
+ {
+ // a boolean value cannot be empty
+ return false;
+ }
+}