db/upnp/Directory: move checkobjok() to class UPnPDirObject

src/db/plugins/upnp/Directory.cxx

@@ -197,16 +197,6 @@ protected:
 		}
 	}
 
-	bool checkobjok() {
-		if (m_tobj.id.empty() || m_tobj.parent_id.empty() ||
-		    m_tobj.name.empty() ||
-		    (m_tobj.type == UPnPDirObject::Type::ITEM &&
-		     m_tobj.item_class == UPnPDirObject::ItemClass::UNKNOWN))
-			return false;
-
-		return true;
-	}
-
 	virtual void EndElement(const XML_Char *name)
 	{
 		if (tag_type != TAG_NUM_OF_ITEM_TYPES) {
@@ -223,7 +213,7 @@ protected:
 		}
 
 		if ((!strcmp(name, "container") || !strcmp(name, "item")) &&
-		    checkobjok()) {
+		    m_tobj.Check()) {
 			tag.Commit(m_tobj.tag);
 			m_dir.objects.emplace_back(std::move(m_tobj));
 		}

src/db/plugins/upnp/Object.hxx

@@ -21,6 +21,7 @@
 #define MPD_UPNP_OBJECT_HXX
 
 #include "tag/Tag.hxx"
+#include "Compiler.h"
 
 #include <string>
 
@@ -87,6 +88,13 @@ public:
 		item_class = ItemClass::UNKNOWN;
 		tag.Clear();
 	}
+
+	gcc_pure
+	bool Check() const {
+		return !id.empty() && !parent_id.empty() && !name.empty() &&
+			(type != UPnPDirObject::Type::ITEM ||
+			 item_class != UPnPDirObject::ItemClass::UNKNOWN);
+	}
 };
 
 #endif /* _UPNPDIRCONTENT_H_X_INCLUDED_ */