<?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;

/**

 * This class builds merge conditions.

 *

 * @author Johannes M. Schmitt <schmittjoh@gmail.com>

 */

class MergeBuilder

{

    protected $node;

    public $allowFalse;

    public $allowOverwrite;

    /**

     * Constructor

     *

     * @param NodeDefinition $node The related node

     */

    public function __construct(NodeDefinition $node)

    {

        $this->node = $node;

        $this->allowFalse = false;

        $this->allowOverwrite = true;

    }

    /**

     * Sets whether the node can be unset.

     *

     * @param Boolean $allow

     * @return MergeBuilder

     */

    public function allowUnset($allow = true)

    {

        $this->allowFalse = $allow;

        return $this;

    }

    /**

     * Sets whether the node can be overwritten.

     *

     * @param Boolean $deny Whether the overwriting is forbidden or not

     *

     * @return MergeBuilder

     */

    public function denyOverwrite($deny = true)

    {

        $this->allowOverwrite = !$deny;

        return $this;

    }

    /**

     * Returns the related node.

     *

     * @return NodeDefinition

     */

    public function end()

    {

        return $this->node;

    }

}