[DDC-551] Initial code for filter functionality

lib/Doctrine/ORM/Configuration.php

@@ -515,4 +515,16 @@ class Configuration extends \Doctrine\DBAL\Configuration
         }
         return $this->_attributes['classMetadataFactoryName'];
     }
-}
+
+    public function addFilter($name, $className)
+    {
+        $this->_attributes['filters'][strtolower($name)] = $className;
+    }
+
+    public function getFilterClassName($name)
+    {
+        $name = strtolower($name);
+        return isset($this->_attributes['filters'][$name]) ?
+                $this->_attributes['filters'][$name] : null;
+    }
+}

lib/Doctrine/ORM/EntityManager.php

@@ -110,6 +110,13 @@ class EntityManager implements ObjectManager
      */
     private $closed = false;
 
+    /**
+     * Instances of enabled filters.
+     *
+     * @var array
+     */
+    private $enabledFilters;
+
     /**
      * Creates a new EntityManager that operates on the given database connection
      * and uses the given Configuration and EventManager implementations.
@@ -739,4 +746,46 @@ class EntityManager implements ObjectManager
 
         return new EntityManager($conn, $config, $conn->getEventManager());
     }
+
+    /** @return SQLFilter[] */
+    public function getEnabledFilters()
+    {
+        return $enabledFilters;
+    }
+
+    /** Throws exception if filter does not exist. No-op if the filter is alrady enabled.
+    * @return SQLFilter */
+    public function enableFilter($name)
+    {
+        if(null === $filterClass = $this->config->getFilter($name)) {
+            throw new \InvalidArgumentException("Filter '" . $name . "' is does not exist.");
+        }
+
+        if(!isset($this->enabledFilters[$name])) {
+            $this->enabledFilters[$name] = new $filterClass($this->conn);
+        }
+
+        return $this->enabledFilters[$name];
+    }
+
+    /** Disable the filter, looses the state */
+    public function disableFilter($name)
+    {
+        // Get the filter to return it
+        $filter = $this->getFilter($name);
+
+        unset($this->enabledFilters[$name]);
+
+        return $filter;
+    }
+
+    /** throws exception if not in enabled filters */
+    public function getFilter($name)
+    {
+        if(!isset($this->enabledFilters[$name])) {
+            throw new \InvalidArgumentException("Filter '" . $name . "' is not enabled.");
+        }
+
+        return $this->enabledFilters[$name];
+    }
 }

lib/Doctrine/ORM/Query/Filter/SQLFilter.php

@@ -0,0 +1,61 @@
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Query\Filter;
+
+use Doctrine\DBAL\Connection;
+
+/**
+ * The base class that user defined filters should extend.
+ *
+ * Handles the setting and escaping of parameters.
+ *
+ * @author Alexander <iam.asm89@gmail.com>
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @abstract
+ */
+abstract class SQLFilter
+{
+    private $conn;
+
+    private $parameters;
+
+    final public function __construct(Connection $conn)
+    {
+        $this->conn = $conn;
+    }
+
+    final function setParameter($name, $value, $type)
+    {
+        // @todo: check for a valid type?
+        $parameters[$name] = array('value' => $value, 'type' => $type);
+    }
+
+    final function getParameter($name)
+    {
+        if(!isset($parameters[$name])) {
+            throw new \InvalidArgumentException("Parameter '" . $name . "' is does not exist.");
+        }
+
+        // @todo: espace the parameter
+        return $paramaters[$name]['value'];
+    }
+
+    abstract function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias);
+}