1 <?php

     2 

     3 /*

     4  * This file is part of the Symfony package.

     5  *

     6  * (c) Fabien Potencier <fabien@symfony.com>

     7  *

     8  * For the full copyright and license information, please view the LICENSE

     9  * file that was distributed with this source code.

    10  */

    11 

    12 namespace Symfony\Component\Config\Definition\Builder;

    13 

    14 /**

    15  * This class builds merge conditions.

    16  *

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

    18  */

    19 class MergeBuilder

    20 {

    21     protected $node;

    22     public $allowFalse;

    23     public $allowOverwrite;

    24 

    25     /**

    26      * Constructor

    27      *

    28      * @param NodeDefinition $node The related node

    29      */

    30     public function __construct(NodeDefinition $node)

    31     {

    32         $this->node = $node;

    33         $this->allowFalse = false;

    34         $this->allowOverwrite = true;

    35     }

    36 

    37     /**

    38      * Sets whether the node can be unset.

    39      *

    40      * @param Boolean $allow

    41      * @return MergeBuilder

    42      */

    43     public function allowUnset($allow = true)

    44     {

    45         $this->allowFalse = $allow;

    46 

    47         return $this;

    48     }

    49 

    50     /**

    51      * Sets whether the node can be overwritten.

    52      *

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

    54      *

    55      * @return MergeBuilder

    56      */

    57     public function denyOverwrite($deny = true)

    58     {

    59         $this->allowOverwrite = !$deny;

    60 

    61         return $this;

    62     }

    63 

    64     /**

    65      * Returns the related node.

    66      *

    67      * @return NodeDefinition

    68      */

    69     public function end()

    70     {

    71         return $this->node;

    72     }

    73 }