1: <?php
 2: /**
 3:  * This is a simple class that uses reflection to figure out the dependencies of
 4:  * a method and attempts to return them using the Injector instance.
 5:  *
 6:  * @author   Bob Mckee <bmckee@bywires.com>
 7:  * @author   James Pepin <james@jamespepin.com>
 8:  * @author   Chuck Hagenbuch <chuck@horde.org>
 9:  * @category Horde
10:  * @package  Injector
11:  */
12: class Horde_Injector_DependencyFinder
13: {
14:     /**
15:      * TODO
16:      *
17:      * @param Horde_Injector $injector  TODO
18:      * @param ReflectionMethod $method  TODO
19:      *
20:      * @return array  TODO
21:      * @throws Horde_Injector_Exception
22:      */
23:     public function getMethodDependencies(Horde_Injector $injector,
24:                                           ReflectionMethod $method)
25:     {
26:         $dependencies = array();
27: 
28:         try {
29:             foreach ($method->getParameters() as $parameter) {
30:                 $dependencies[] = $this->getParameterDependency($injector, $parameter);
31:             }
32:         } catch (Horde_Injector_Exception $e) {
33:             throw new Horde_Injector_Exception("$method has unfulfilled dependencies ($parameter)", 0, $e);
34:         }
35: 
36:         return $dependencies;
37:     }
38: 
39:     /**
40:      * TODO
41:      *
42:      * @param Horde_Injector $injector     TODO
43:      * @param ReflectionParameter $method  TODO
44:      *
45:      * @return mixed  TODO
46:      * @throws Horde_Injector_Exception
47:      */
48:     public function getParameterDependency(Horde_Injector $injector,
49:                                            ReflectionParameter $parameter)
50:     {
51:         if ($parameter->getClass()) {
52:             return $injector->getInstance($parameter->getClass()->getName());
53:         } elseif ($parameter->isOptional()) {
54:             return $parameter->getDefaultValue();
55:         }
56: 
57:         throw new Horde_Injector_Exception("Untyped parameter \$" . $parameter->getName() . "can't be fulfilled");
58:     }
59: 
60: }
61: