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+Filters
+=======
+
+Doctrine 2.2 features a filter system that allows the developer to add SQL to
+the conditional clauses of queries, regardless the place where the SQL is
+generated (e.g. from a DQL query, or by loading associated entities). To give
+you an idea on how it works, this chapter starts with an example of a filter.
+
+
+Example filter class
+--------------------
+Throughout this document the example ``MyLocaleFilter`` class will be used to
+illustrate how the filter feature works. A filter class should extend the base
+``Doctrine\ORM\Query\Filter\SQLFilter`` class and implement the ``addFilterConstraint``
+method. The method receives the ClassMetadata of the filtered entity and the
+table alias of the table of the entity.
+
+.. code-block:: php
+    <?php
+    namespace Example;
+    use Doctrine\ORM\Mapping\ClassMetaData,
+        Doctrine\ORM\Query\Filter\SQLFilter;
+
+    class MyLocaleFilter extends SQLFilter
+    {
+        public function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias)
+        {
+            // Check if the entity implements the LocalAware interface
+            if (!in_array("LocaleAware", $targetEntity->reflClass->getInterfaceNames())) {
+                return "";
+            }
+
+            return $targetTableAlias.'.locale = ' . $this->getParameter('locale');
+        }
+    }
+
+
+
+
+Configuration
+-------------
+Filter classes are added to the configuration as following:
+
+.. code-block:: php
+    <?php
+    $config->addFilter("locale", "\Doctrine\Tests\ORM\Functional\MyLocaleFilter");
+
+
+The ``addFilter()`` method takes a name for the filter and the name of the
+class responsible for the actual filtering.
+
+
+Enabling Filters and Setting Parameters
+---------------------------------------------------
+Filters can be enabled via the ``FilterCollection`` that is available in the
+``EntityManager``. The ``enable`` function will return the filter object. This
+object can be used to set certain parameters for the filter.
+
+.. code-block:: php
+    <?php
+    $filter = $em->getFilters()->enable("locale");
+    $filter->setParameter('locale', 'en');
+
+
+Disabling Filters
+-----------------
+.. code-block:: php
+    $filter = $em->getFilters()->disable("locale");