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<?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\NodeInterface;
/**
* This is the entry class for building a config tree.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class TreeBuilder implements NodeParentInterface
{
protected $tree;
protected $root;
protected $builder;
/**
* Creates the root node.
*
* @param string $name The name of the root node
* @param string $type The type of the root node
* @param NodeBuilder $builder A custom node builder instance
*
* @return ArrayNodeDefinition|NodeDefinition The root node (as an ArrayNodeDefinition when the type is 'array')
*
* @throws \RuntimeException When the node type is not supported
*/
public function root($name, $type = 'array', NodeBuilder $builder = null)
{
$builder = $builder ?: new NodeBuilder();
return $this->root = $builder->node($name, $type)->setParent($this);
}
/**
* Builds the tree.
*
* @return NodeInterface
*
* @throws \RuntimeException
*/
public function buildTree()
{
if (null === $this->root) {
throw new \RuntimeException('The configuration tree has no root node.');
}
if (null !== $this->tree) {
return $this->tree;
}
return $this->tree = $this->root->getNode(true);
}
}
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