Merge pull request #4827 from acozzette/merge-3-6-x

Merge 3.6.x branch into master

1 files changed, 24 insertions, 1 deletions

diff --git a/php/src/Google/Protobuf/Internal/MapField.php b/php/src/Google/Protobuf/Internal/MapField.php
index 38736dad..f7d7b710 100644
--- a/php/src/Google/Protobuf/Internal/MapField.php
+++ b/php/src/Google/Protobuf/Internal/MapField.php
@@ -58,7 +58,11 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
     /**
      * @ignore
      */
-    private $value_klass;
+    private $klass;
+    /**
+     * @ignore
+     */
+    private $legacy_klass;
 
     /**
      * Constructs an instance of MapField.
@@ -75,6 +79,17 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
         $this->key_type = $key_type;
         $this->value_type = $value_type;
         $this->klass = $klass;
+
+        if ($this->value_type == GPBType::MESSAGE) {
+            $pool = DescriptorPool::getGeneratedPool();
+            $desc = $pool->getDescriptorByClassName($klass);
+            if ($desc == NULL) {
+                new $klass;  // No msg class instance has been created before.
+                $desc = $pool->getDescriptorByClassName($klass);
+            }
+            $this->klass = $desc->getClass();
+            $this->legacy_klass = $desc->getLegacyClass();
+        }
     }
 
     /**
@@ -102,6 +117,14 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
     }
 
     /**
+     * @ignore
+     */
+    public function getLegacyValueClass()
+    {
+        return $this->legacy_klass;
+    }
+
+    /**
      * Return the element at the given key.
      *
      * This will also be called for: $ele = $arr[$key]