Add initial support for database model serialization to XML

1 files changed, 32 insertions, 21 deletions

diff --git a/odb/semantics/relational/foreign-key.hxx b/odb/semantics/relational/foreign-key.hxx
index d4419dd..1c00873 100644
--- a/odb/semantics/relational/foreign-key.hxx
+++ b/odb/semantics/relational/foreign-key.hxx
@@ -5,6 +5,8 @@
 #ifndef ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX
 #define ODB_SEMANTICS_RELATIONAL_FOREIGN_KEY_HXX
 
+#include <iosfwd>
+
 #include <odb/semantics/relational/elements.hxx>
 #include <odb/semantics/relational/key.hxx>
 
@@ -15,24 +17,6 @@ namespace semantics
     class foreign_key: public key
     {
     public:
-      enum action
-      {
-        no_action,
-        cascade
-      };
-
-      foreign_key (string const& id,
-                   qname const& referenced_table,
-                   bool deferred,
-                   action on_delete = no_action)
-          : key (id),
-            referenced_table_ (referenced_table),
-            deferred_ (deferred),
-            on_delete_ (on_delete)
-      {
-      }
-
-    public:
       qname const&
       referenced_table () const
       {
@@ -60,26 +44,53 @@ namespace semantics
         return deferred_;
       }
 
-    public:
-      action
+      enum action_type
+      {
+        no_action,
+        cascade
+      };
+
+      action_type
       on_delete () const
       {
         return on_delete_;
       }
 
     public:
+      foreign_key (string const& id,
+                   qname const& referenced_table,
+                   bool deferred,
+                   action_type on_delete = no_action)
+          : key (id),
+            referenced_table_ (referenced_table),
+            deferred_ (deferred),
+            on_delete_ (on_delete)
+      {
+      }
+
+      foreign_key (xml::parser&, uscope&, graph&);
+
       virtual string
       kind () const
       {
         return "foreign key";
       }
 
+      virtual void
+      serialize (xml::serializer&) const;
+
     private:
       qname referenced_table_;
       columns referenced_columns_;
       bool deferred_;
-      action on_delete_;
+      action_type on_delete_;
     };
+
+    std::ostream&
+    operator<< (std::ostream&, foreign_key::action_type);
+
+    std::istream&
+    operator>> (std::istream&, foreign_key::action_type&);
   }
 }