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   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 = false;
  23      public $allowOverwrite = true;
  24  
  25      public function __construct(NodeDefinition $node)
  26      {
  27          $this->node = $node;
  28      }
  29  
  30      /**
  31       * Sets whether the node can be unset.
  32       *
  33       * @param bool $allow
  34       *
  35       * @return $this
  36       */
  37      public function allowUnset($allow = true)
  38      {
  39          $this->allowFalse = $allow;
  40  
  41          return $this;
  42      }
  43  
  44      /**
  45       * Sets whether the node can be overwritten.
  46       *
  47       * @param bool $deny Whether the overwriting is forbidden or not
  48       *
  49       * @return $this
  50       */
  51      public function denyOverwrite($deny = true)
  52      {
  53          $this->allowOverwrite = !$deny;
  54  
  55          return $this;
  56      }
  57  
  58      /**
  59       * Returns the related node.
  60       *
  61       * @return NodeDefinition|ArrayNodeDefinition|VariableNodeDefinition
  62       */
  63      public function end()
  64      {
  65          return $this->node;
  66      }
  67  }