add getter methods to Document.

Author: senojj

src/Document.php

@@ -20,6 +20,7 @@ public function __construct()
         $this->template = null;
         $this->queries = new QueryGroup();
     }
+
     /**
      * @param Collection $collection
      */
@@ -28,6 +29,14 @@ public function setCollection(Collection $collection)
         $this->collection = $collection;
     }
 
+    /**
+     * @return Collection|null
+     */
+    public function getCollection()
+    {
+        return $this->collection;
+    }
+
     /**
      *
      */
@@ -44,6 +53,14 @@ public function setError(Error $error)
         $this->error = $error;
     }
 
+    /**
+     * @return Error|null
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
     /**
      *
      */
@@ -60,6 +77,14 @@ public function setTemplate(Template $template)
         $this->template = $template;
     }
 
+    /**
+     * @return Template|null
+     */
+    public function getTemplate()
+    {
+        return $this->template;
+    }
+
     /**
      *
      */