symfony · TerjeBr · Dec 16, 2012
diff --git a/src/Symfony/Component/HttpFoundation/Session/Attribute/EmptyAttributeBag.php b/src/Symfony/Component/HttpFoundation/Session/Attribute/EmptyAttributeBag.php
@@ -0,0 +1,114 @@
+<
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;?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Attribute;
+
+use Symfony\Component\HttpFoundation\Session\EmptyBag;
+use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
+use Symfony\Component\HttpFoundation\Session\Storage\EmptyStorageInterface;
+
+/**
+ * A wrapper class for an empty attribute bag
+ *
+ * @author Terje Bråten <terje@braten.be>
+ */
+class EmptyAttributeBag extends EmptyBag implements AttributeBagInterface, \IteratorAggregate, \Countable
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function has($name)
+    {
+        if ($this->isEmpty) {
+            return false;
+        }
+
+        return $this->realBag->has($name);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get($name, $default = null)
+    {
+        if ($this->isEmpty) {
+            return $default;
+        }
+
+        return $this->realBag->get($name, $default);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function set($name, $value)
+    {
+        $this->startSession();
+        $this->realBag->set($name, $value);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function all()
+    {
+        if ($this->isEmpty) {
+            return array();
+        }
+
+        return $this->realBag->all();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function replace(array $attributes)
+    {
+        $this->startSession();
+        $this->realBag->replace($attributes);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function remove($name)
+    {
+        if ($this->isEmpty) {
+            return null;
+        }
+
+        return $this->realBag->remove($name);
+    }
+
+    /**
+     * Returns an iterator for attributes.
+     *
+     * @return \ArrayIterator An \ArrayIterator instance
+     */
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->all());
+    }
+
+    /**
+     * Returns the number of attributes.
+     *
+     * @return int The number of attributes
+     */
+    public function count()
+    {
+        if ($this->isEmpty) {
+            return 0;
+        }
+
+        return $this->realBag->count();
+    }
+}
diff --git a/src/Symfony/Component/HttpFoundation/Session/EmptyBag.php b/src/Symfony/Component/HttpFoundation/Session/EmptyBag.php
@@ -0,0 +1,133 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session;
+
+use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface;
+use Symfony\Component\HttpFoundation\Session\Attribute\EmptyAttributeBag;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
+use Symfony\Component\HttpFoundation\Session\Flash\EmptyFlashBag;
+use Symfony\Component\HttpFoundation\Session\Storage\EmptyStorageInterface;
+
+/**
+ * Abstract base class for Empty Session bags
+ *
+ * @author Terje Bråten <terje@braten.be>
+ */
+class EmptyBag implements SessionBagInterface
+{
+    /**
+     *  Flag if the bag is still empty
+     *
+     *  @var boolean $isEmpty
+     */
+    protected $isEmpty = true;
+
+    /**
+     * The empty storage containing this bag
+     *
+     * @var EmptyStorageInterface $storage
+     */
+    protected $storage;
+
+    /**
+     * The session bag this empty bag is a proxy for
+     *
+     * @var SessionBagInterface $realBag
+     */
+    protected $realBag;
+
+    /**
+     * Constructor.
+     *
+     * @param EmptyStorageInterface $storage
+     * @param SessionBagInterface   $realBag
+     */
+    public function __construct(EmptyStorageInterface $storage, SessionBagInterface $realBag)
+    {
+        $this->storage = $storage;
+        $this->realBag = $realBag;
+    }
+
+    /**
+     * Create a new empty bag
+     *
+     * @param EmptyStorageInterface $storage
+     * @param SessionBagInterface   $realBag
+     */
+    public static function create(EmptyStorageInterface $storage,
+                                  SessionBagInterface $realBag)
+    {
+        if ($realBag instanceof AttributeBagInterface) {
+            return new EmptyAttributeBag($storage, $realBag);
+        }
+        if ($realBag instanceof FlashBagInterface) {
+            return new EmptyFlashBag($storage, $realBag);
+        }
+
+        throw new \LogicException('Unknown bag interface');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return $this->realBag->getName();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function initialize(array &$array)
+    {
+        $this->startSession();
+
+        return $this->realBag->initialize($array);
+    }
+
+    /**
+     * Start the session
+     * Something has been written to the bag,
+     * and the storage must be informed
+     */
+    protected function startSession()
+    {
+        if ($this->isEmpty) {
+            $this->isEmpty = false;
+            $this->realBag = $this->storage->getRealBag($this->getName());
+        }
+    }
+
+    /**
+     * Gets the storage key for this bag.
+     *
+     * @return string
+     */
+    public function getStorageKey()
+    {
+        return $this->realBag->getStorageKey();
+    }
+
+    /**
+     * Clears out data from bag.
+     *
+     * @return mixed Whatever data was contained.
+     */
+    public function clear()
+    {
+        if ($this->isEmpty) {
+            return array();
+        }
+
+        return $this->realBag->clear();
+    }
+}
diff --git a/src/Symfony/Component/HttpFoundation/Session/Flash/EmptyFlashBag.php b/src/Symfony/Component/HttpFoundation/Session/Flash/EmptyFlashBag.php
@@ -0,0 +1,147 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Flash;
+
+use Symfony\Component\HttpFoundation\Session\EmptyBag;
+use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
+use Symfony\Component\HttpFoundation\Session\Storage\EmptyStorageInterface;
+
+/**
+ * A wrapper class for an empty FlashBag flash message container.
+ *
+ * @author Terje Bråten <terje@braten.be>
+ */
+class EmptyFlashBag extends EmptyBag implements FlashBagInterface, \IteratorAggregate, \Countable
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function add($type, $message)
+    {
+        $this->startSession();
+        $this->realBag->add($type, $message);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function peek($type, array $default = array())
+    {
+        if ($this->isEmpty) {
+            return $default;
+        }
+
+        return $this->realBag->peek($type, $default);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function peekAll()
+    {
+        if ($this->isEmpty) {
+            return array();
+        }
+
+        return $this->realBag->peekAll();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get($type, array $default = array())
+    {
+        if ($this->isEmpty) {
+            return $default;
+        }
+
+        return $this->realBag->get($type, $default);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function all()
+    {
+        if ($this->isEmpty) {
+            return array();
+        }
+
+        return $this->realBag->all();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function set($type, $messages)
+    {
+        $this->startSession();
+        $this->realBag->set($type, $messages);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setAll(array $messages)
+    {
+        $this->startSession();
+        $this->realBag->setAll($messages);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function has($type)
+    {
+        if ($this->isEmpty) {
+            return false;
+        }
+
+        return $this->realBag->has($type);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function keys()
+    {
+        if ($this->isEmpty) {
+            return array();
+        }
+
+        return $this->realBag->keys();
+    }
+
+    /**
+     * Returns an iterator for flashes.
+     *
+     * @return \ArrayIterator An \ArrayIterator instance
+     */
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->all());
+    }
+
+    /**
+     * Returns the number of flashes.
+     *
+     * @return int The number of flashes
+     */
+    public function count()
+    {
+        if ($this->isEmpty) {
+            return 0;
+        }
+
+        return $this->realBag->count();
+    }
+}