PHPLIB-73: Database and Collection can inherit RP/WC from Manager

Helper functions are necessary until PHPC-417 is implemented and Manager getters return actual value objects.

Author: jmikola

src/Client.php

@@ -75,8 +75,8 @@ public function listDatabases(array $options = array())
     public function selectCollection($databaseName, $collectionName, WriteConcern $writeConcern = null, ReadPreference $readPreference = null)
     {
         $namespace = $databaseName . '.' . $collectionName;
-        $writeConcern = $writeConcern ?: $this->manager->getWriteConcern();
-        $readPreference = $readPreference ?: $this->manager->getReadPreference();
+        $writeConcern = $writeConcern ?: \MongoDB\copy_manager_write_concern($this->manager);
+        $readPreference = $readPreference ?: \MongoDB\copy_manager_read_preference($this->manager);
 
         return new Collection($this->manager, $namespace, $writeConcern, $readPreference);
     }
@@ -94,8 +94,8 @@ public function selectCollection($databaseName, $collectionName, WriteConcern $w
      */
     public function selectDatabase($databaseName, WriteConcern $writeConcern = null, ReadPreference $readPreference = null)
     {
-        $writeConcern = $writeConcern ?: $this->manager->getWriteConcern();
-        $readPreference = $readPreference ?: $this->manager->getReadPreference();
+        $writeConcern = $writeConcern ?: \MongoDB\copy_manager_write_concern($this->manager);
+        $readPreference = $readPreference ?: \MongoDB\copy_manager_read_preference($this->manager);
 
         return new Database($this->manager, $databaseName, $writeConcern, $readPreference);
     }

src/Collection.php

@@ -66,8 +66,8 @@ public function __construct(Manager $manager, $namespace, WriteConcern $writeCon
         $this->collectionName = $parts[1];
 
         $this->manager = $manager;
-        $this->writeConcern = $writeConcern;
-        $this->readPreference = $readPreference;
+        $this->writeConcern = $writeConcern ?: \MongoDB\copy_manager_write_concern($this->manager);
+        $this->readPreference = $readPreference ?: \MongoDB\copy_manager_read_preference($this->manager);
     }
 
     /**

src/Database.php

@@ -44,8 +44,8 @@ public function __construct(Manager $manager, $databaseName, WriteConcern $write
 
         $this->manager = $manager;
         $this->databaseName = (string) $databaseName;
-        $this->writeConcern = $writeConcern;
-        $this->readPreference = $readPreference;
+        $this->writeConcern = $writeConcern ?: \MongoDB\copy_manager_write_concern($this->manager);
+        $this->readPreference = $readPreference ?: \MongoDB\copy_manager_read_preference($this->manager);
     }
 
     /**

src/functions.php

@@ -2,8 +2,12 @@
 
 namespace MongoDB;
 
+use MongoDB\Driver\Manager;
+use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
+use MongoDB\Driver\WriteConcern;
 use MongoDB\Exception\InvalidArgumentTypeException;
+use ReflectionClass;
 
 /**
  * Return whether the first key in the document starts with a "$" character.
@@ -30,6 +34,61 @@ function is_first_key_operator($document)
     return (isset($firstKey[0]) && $firstKey[0] == '$');
 }
 
+/**
+ * Creates a new ReadPreference instance from the Manager's read preference.
+ *
+ * @internal
+ * @todo this function can be removed once PHPC-417 is implemented
+ * @param Manager $manager
+ * @return ReadPreference
+ */
+function copy_manager_read_preference(Manager $manager)
+{
+    $rp = $manager->getReadPreference();
+
+    $args = array(
+        $rp['mode'],
+    );
+
+    if (isset($rp['tags'])) {
+        $args[] = $rp['tags'];
+    }
+
+    $rc = new ReflectionClass('MongoDB\Driver\ReadPreference');
+
+    return $rc->newInstanceArgs($args);
+}
+
+/**
+ * Creates a new WriteConcern instance from the Manager's write concern.
+ *
+ * @internal
+ * @todo this function can be removed once PHPC-417 is implemented
+ * @param Manager $manager
+ * @return WriteConcern
+ */
+function copy_manager_write_concern(Manager $manager)
+{
+    $wc = $manager->getWriteConcern();
+
+    $args = array(
+        isset($wc['w']) ? $wc['w'] : -2,
+        $wc['wtimeout'],
+    );
+
+    if (isset($wc['journal'])) {
+        $args[] = $wc['journal'];
+
+        if (isset($wc['fsync'])) {
+            $args[] = $wc['fsync'];
+        }
+    }
+
+    $rc = new ReflectionClass('MongoDB\Driver\WriteConcern');
+
+    return $rc->newInstanceArgs($args);
+}
+
 /**
  * Generate an index name from a key specification.
  *