Add loadAliasPackage to the StreamableRepositoryInterface and clear up responsibilities between Pool and Repositories

src/Composer/DependencyResolver/Pool.php

@@ -44,13 +44,11 @@ class Pool
     protected $packageByName = array();
     protected $acceptableStabilities;
     protected $stabilityFlags;
-    protected $loader;
     protected $versionParser;
 
     public function __construct($minimumStability = 'stable', array $stabilityFlags = array())
     {
         $stabilities = BasePackage::$stabilities;
-        $this->loader = new ArrayLoader;
         $this->versionParser = new VersionParser;
         $this->acceptableStabilities = array();
         foreach (BasePackage::$stabilities as $stability => $value) {
@@ -313,19 +311,15 @@ class Pool
     {
         if (is_array($data)) {
             if (isset($data['alias_of'])) {
-                // TODO move to $repo->loadAliasPackage?
                 $aliasOf = $this->packageById($data['alias_of']);
-                $rootAlias = !empty($data['root_alias']);
-                $package = $this->packages[$data['id'] - 1] = new AliasPackage($aliasOf, $data['version'], $data['alias']);
-                $package->setId($data['id']);
-                $package->setRootPackageAlias($rootAlias);
-
-                return $package;
+                $package = $this->packages[$data['id'] - 1] = $data['repo']->loadAliasPackage($data, $aliasOf);
+                $package->setRootPackageAlias(!empty($data['root_alias']));
+            } else {
+                $package = $this->packages[$data['id'] - 1] = $data['repo']->loadPackage($data);
             }
 
-            $package = $this->packages[$data['id'] - 1] = $data['repo']->loadPackage($data, $data['id']);
-
-            return $package;
+            $package->setId($data['id']);
+            $data = $package;
         }
 
         return $data;
@@ -342,6 +336,7 @@ class Pool
      */
     private function match($candidate, $name, LinkConstraintInterface $constraint)
     {
+        // handle array packages
         if (is_array($candidate)) {
             $candidateName = $candidate['name'];
             $candidateVersion = $candidate['version'];
@@ -357,6 +352,7 @@ class Pool
                 }
             }
         } else {
+            // handle object packages
             $candidateName = $candidate->getName();
             $candidateVersion = $candidate->getVersion();
             $provides = $candidate->getProvides();
@@ -381,5 +377,4 @@ class Pool
 
         return self::MATCH_NONE;
     }
-
 }

src/Composer/Repository/ComposerRepository.php

@@ -81,6 +81,9 @@ class ComposerRepository extends ArrayRepository implements NotifiableRepository
         @file_get_contents($url, false, $context);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function getMinimalPackages()
     {
         if (isset($this->minimalPackages)) {
@@ -119,15 +122,31 @@ class ComposerRepository extends ArrayRepository implements NotifiableRepository
         return $this->minimalPackages;
     }
 
-    public function loadPackage(array $data, $id)
+    /**
+     * {@inheritDoc}
+     */
+    public function loadPackage(array $data)
     {
         $package = $this->loader->load($data['raw']);
-        $package->setId($id);
         $package->setRepository($this);
 
         return $package;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function loadAliasPackage(array $data, PackageInterface $aliasOf)
+    {
+        $aliasPackage = $this->createAliasPackage($aliasOf, $data['version'], $data['alias']);
+        $aliasPackage->setRepository($this);
+
+        return $aliasPackage;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
     protected function initialize()
     {
         parent::initialize();

src/Composer/Repository/StreamableRepositoryInterface.php

@@ -12,6 +12,7 @@
 
 namespace Composer\Repository;
 
+use Composer\Package\AliasPackage;
 use Composer\Package\PackageInterface;
 
 /**
@@ -22,9 +23,33 @@ interface StreamableRepositoryInterface extends RepositoryInterface
     /**
      * Return partial package data without loading them all to save on memory
      *
+     * The package array must contain the following fields:
+     *  - name: package name (normalized/lowercased)
+     *  - repo: reference to the repository instance
+     *  - version: normalized version
+     *  - replace: array of package name => version constraint, optional
+     *  - provide: array of package name => version constraint, optional
+     *  - alias: pretty alias that this package should be aliased to, optional
+     *  - alias_normalized: normalized alias that this package should be aliased to, optional
+     *
      * @return array
      */
     public function getMinimalPackages();
 
-    public function loadPackage(array $data, $id);
+    /**
+     * Loads a package from minimal info of the package
+     *
+     * @param array $data the minimal info as was returned by getMinimalPackage
+     * @return PackageInterface
+     */
+    public function loadPackage(array $data);
+
+    /**
+     * Loads an alias package from minimal info of the package
+     *
+     * @param array            $data      the minimal info as was returned by getMinimalPackage
+     * @param PackageInterface $aliasOf   the package which this alias is an alias of
+     * @return AliasPackage
+     */
+    public function loadAliasPackage(array $data, PackageInterface $aliasOf);
 }