git.stricted.de - GitHub/WoltLab/WCF.git/blob

   1 <?php
   2 /**
   3  * PHP-DI
   4  *
   5  * @link      http://mnapoli.github.com/PHP-DI/
   6  * @copyright Matthieu Napoli (http://mnapoli.fr/)
   7  * @license   http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file)
   8  */
   9
  10 namespace DI\Definition\Resolver;
  11
  12 use DI\Definition\Definition;
  13 use DI\Definition\EnvironmentVariableDefinition;
  14 use DI\Definition\Exception\DefinitionException;
  15 use DI\Definition\Helper\DefinitionHelper;
  16
  17 /**
  18  * Resolves a environment variable definition to a value.
  19  *
  20  * @author James Harris <james.harris@icecave.com.au>
  21  */
  22 class EnvironmentVariableResolver implements DefinitionResolver
  23 {
  24     /**
  25      * @var DefinitionResolver
  26      */
  27     private $definitionResolver;
  28
  29     /**
  30      * @var callable
  31      */
  32     private $variableReader;
  33
  34     public function __construct(DefinitionResolver $definitionResolver, $variableReader = 'getenv')
  35     {
  36         $this->definitionResolver = $definitionResolver;
  37         $this->variableReader = $variableReader;
  38     }
  39
  40     /**
  41      * Resolve an environment variable definition to a value.
  42      *
  43      * @param EnvironmentVariableDefinition $definition
  44      *
  45      * {@inheritdoc}
  46      */
  47     public function resolve(Definition $definition, array $parameters = [])
  48     {
  49         $value = call_user_func($this->variableReader, $definition->getVariableName());
  50
  51         if (false !== $value) {
  52             return $value;
  53         }
  54
  55         if (!$definition->isOptional()) {
  56             throw new DefinitionException(sprintf(
  57                 "The environment variable '%s' has not been defined",
  58                 $definition->getVariableName()
  59             ));
  60         }
  61
  62         $value = $definition->getDefaultValue();
  63
  64         // Nested definition
  65         if ($value instanceof DefinitionHelper) {
  66             return $this->definitionResolver->resolve($value->getDefinition(''));
  67         }
  68
  69         return $value;
  70     }
  71
  72     /**
  73      * @param EnvironmentVariableDefinition $definition
  74      *
  75      * {@inheritdoc}
  76      */
  77     public function isResolvable(Definition $definition, array $parameters = [])
  78     {
  79         return true;
  80     }
  81 }