Split MySQL code generator into common and db-specific parts

The common part (in relational/) still has some MySQL-specific parts.
Also, add the notion of the current context which is used to avoid
explicitly passing the context object to every generator's c-tor.

1 files changed, 81 insertions, 0 deletions

diff --git a/odb/relational/context.hxx b/odb/relational/context.hxx
new file mode 100644
index 0000000..fbd6059
--- /dev/null
+++ b/odb/relational/context.hxx
@@ -0,0 +1,81 @@
+// file      : odb/relational/context.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_RELATIONAL_CONTEXT_HXX
+#define ODB_RELATIONAL_CONTEXT_HXX
+
+#include <odb/context.hxx>
+
+namespace relational
+{
+  class context: public virtual ::context
+  {
+  public:
+    // Return true if an object or value type has members for which
+    // the image can grow.
+    //
+    bool
+    grow (semantics::class_&);
+
+    // The same for a member's value type.
+    //
+    bool
+    grow (semantics::data_member&);
+
+    bool
+    grow (semantics::data_member&, semantics::type&, string const& key_prefix);
+
+  public:
+    // Quote SQL identifier.
+    //
+    string
+    quote_id (string const&) const;
+
+  public:
+    context ();
+
+    static context&
+    current ()
+    {
+      return dynamic_cast<context&> (root_context::current ());
+    }
+
+  protected:
+    // The default implementation returns false.
+    //
+    virtual bool
+    grow_impl (semantics::class_&);
+
+    virtual bool
+    grow_impl (semantics::data_member&);
+
+    virtual bool
+    grow_impl (semantics::data_member&,
+               semantics::type&,
+               string const&);
+
+    // The default implementation uses the ISO quoting ("").
+    //
+    virtual string
+    quote_id_impl (string const&) const;
+
+  protected:
+    struct data;
+    typedef context base_context;
+
+    context (data*);
+
+  protected:
+    struct data: root_context::data
+    {
+      data (std::ostream& os): root_context::data (os) {}
+    };
+    data* data_;
+  };
+}
+
+#include <odb/relational/context.ixx>
+
+#endif // ODB_RELATIONAL_CONTEXT_HXX