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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;
  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 bool $allow
  41       *
  42       * @return MergeBuilder
  43       */
  44      public function allowUnset($allow = true)
  45      {
  46          $this->allowFalse = $allow;
  47  
  48          return $this;
  49      }
  50  
  51      /**
  52       * Sets whether the node can be overwritten.
  53       *
  54       * @param bool $deny Whether the overwriting is forbidden or not
  55       *
  56       * @return MergeBuilder
  57       */
  58      public function denyOverwrite($deny = true)
  59      {
  60          $this->allowOverwrite = !$deny;
  61  
  62          return $this;
  63      }
  64  
  65      /**
  66       * Returns the related node.
  67       *
  68       * @return NodeDefinition
  69       */
  70      public function end()
  71      {
  72          return $this->node;
  73      }
  74  }