From 2aa3cabf1b737e225178230882ee9aadfd817ce0 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 28 Mar 2013 16:04:48 +0200
Subject: Add changelog support for add/drop index/foreign key

Also diagnose changes to primary keys and establish the 'alters'
association.
---
 odb/semantics/relational/changelog.cxx | 84 +++++++++++++++++++++++++++++-----
 1 file changed, 73 insertions(+), 11 deletions(-)

(limited to 'odb/semantics/relational/changelog.cxx')

diff --git a/odb/semantics/relational/changelog.cxx b/odb/semantics/relational/changelog.cxx
index cd94494..fb304ca 100644
--- a/odb/semantics/relational/changelog.cxx
+++ b/odb/semantics/relational/changelog.cxx
@@ -3,6 +3,7 @@
 // license   : GNU GPL v3; see accompanying LICENSE file
 
 #include <vector>
+#include <sstream>
 
 #include <cutl/compiler/type-info.hxx>
 
@@ -10,6 +11,8 @@
 #include <odb/semantics/relational/model.hxx>
 #include <odb/semantics/relational/changeset.hxx>
 
+using namespace std;
+
 namespace semantics
 {
   namespace relational
@@ -26,10 +29,12 @@ namespace semantics
       if (p.attribute<unsigned int> ("version") != 1)
         throw parsing (p, "unsupported changelog format version");
 
-      // Get the changesets. Because they are stored in the reverse order,
-      // first save them to the temporary vector.
+      // Because things are stored in the reverse order, first save the
+      // changesets as XML chunks and then re-parse them in the reverse
+      // order. We have to do it this way so that we can do lookups along
+      // the alters edges.
       //
-      typedef std::vector<changeset*> changesets;
+      typedef vector<string> changesets;
       changesets cs;
 
       for (parser::event_type e (p.peek ());
@@ -39,22 +44,79 @@ namespace semantics
         if (p.qname () != xml::qname (xmlns, "changeset"))
           break; // Not our elements.
 
-        p.next ();
-        cs.push_back (&new_node<changeset> (p, *this));
-        p.next_expect (parser::end_element);
-      }
+        ostringstream os;
+        os.exceptions (ios_base::badbit | ios_base::failbit);
+        serializer s (os, "changeset", 0); // No pretty-printing.
+        size_t depth (0);
 
-      for (changesets::reverse_iterator i (cs.rbegin ()); i != cs.rend (); ++i)
-        new_edge<contains_changeset> (*this, **i);
+        do
+        {
+          switch (p.next ())
+          {
+          case parser::start_element:
+            {
+              s.start_element (p.qname ());
+
+              if (depth == 0)
+                s.namespace_decl (xmlns, "");
+
+              typedef parser::attribute_map_type attr_map;
+              attr_map const& am (p.attribute_map ());
+
+              for (attr_map::const_iterator i (am.begin ());
+                   i != am.end (); ++i)
+                s.attribute (i->first, i->second.value);
+
+              depth++;
+              break;
+            }
+          case parser::end_element:
+            {
+              depth--;
+              s.end_element ();
+              break;
+            }
+          case parser::characters:
+            {
+              s.characters (p.value ());
+              break;
+            }
+          default:
+            {
+              depth = 0;
+              break;
+            }
+          }
+        } while (depth != 0);
+
+        cs.push_back (os.str ());
+      }
 
       // Get the model.
       //
       p.next_expect (parser::start_element, xmlns, "model");
-
       model_type& m (new_node<model_type> (p, *this));
       new_edge<contains_model_type> (*this, m);
-
       p.next_expect (parser::end_element);
+
+      // Re-parse the changesets in reverse order.
+      //
+      qscope* base (&m);
+      for (changesets::reverse_iterator i (cs.rbegin ()); i != cs.rend (); ++i)
+      {
+        istringstream is (*i);
+        is.exceptions (ios_base::badbit | ios_base::failbit);
+        parser ip (is, p.input_name ());
+
+        ip.next_expect (parser::start_element, xmlns, "changeset");
+
+        changeset& c (new_node<changeset> (ip, *base, *this));
+        new_edge<contains_changeset> (*this, c);
+        base = &c;
+
+        ip.next_expect (parser::end_element);
+      }
+
       p.next_expect (parser::end_element);
     }
 
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