From 6b8def06796d1e4fc9e6e7e75ce59bccf6899261 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 10 Jul 2012 15:17:16 +0200
Subject: Add support for custom database type mapping

New pragma qualifier, map, and specifiers: as, to, from. New tests:
<database>/custom.
---
 pgsql/custom/traits.hxx | 167 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 pgsql/custom/traits.hxx

(limited to 'pgsql/custom/traits.hxx')

diff --git a/pgsql/custom/traits.hxx b/pgsql/custom/traits.hxx
new file mode 100644
index 0000000..800bfdb
--- /dev/null
+++ b/pgsql/custom/traits.hxx
@@ -0,0 +1,167 @@
+// file      : pgsql/custom/traits.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TRAITS_HXX
+#define TRAITS_HXX
+
+#include <limits>  // std::numeric_limits
+#include <vector>
+#include <sstream>
+#include <cstring> // std::memcpy
+
+#include <odb/pgsql/traits.hxx>
+
+#include "test.hxx" // point
+
+namespace odb
+{
+  namespace pgsql
+  {
+    template <>
+    class value_traits<point, id_string>
+    {
+    public:
+      typedef point value_type;
+      typedef point query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (point& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        if (is_null)
+          v = point ();
+        else
+        {
+          // Point format is "(x,y)".
+          //
+          char c;
+          std::istringstream is (std::string (b.data (), n));
+
+          is >> c;    // '('
+          is >> v.x;
+          is >> c;    // ','
+          is >> v.y;
+        }
+      }
+
+      static void
+      set_image (details::buffer& b,
+                 std::size_t& n,
+                 bool& is_null,
+                 const point& v)
+      {
+        is_null = false;
+        std::ostringstream os;
+
+        // The formula for the number of decimla digits required is given in:
+        //
+        // http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1822.pdf
+        //
+        os.precision (std::numeric_limits<double>::digits10);
+        // os.precision (2 + std::numeric_limits<double>::digits * 301/1000);
+
+        os << '(' << v.x << ',' << v.y << ')';
+
+        const std::string& s (os.str ());
+        n = s.size ();
+
+        if (n > b.capacity ())
+          b.capacity (n);
+
+        std::memcpy (b.data (), s.c_str (), n);
+      }
+    };
+
+    template <>
+    struct type_traits<point>
+    {
+      static const database_type_id db_type_id = id_string;
+
+      struct conversion
+      {
+        static const char* to () {return "(?)::POINT";}
+      };
+    };
+
+    template <>
+    class value_traits<std::vector<int>, id_string>
+    {
+    public:
+      typedef std::vector<int> value_type;
+      typedef value_type query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (value_type& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        v.clear ();
+
+        if (!is_null)
+        {
+          // Array format is "{n1,n2,n3...}".
+          //
+          char c;
+          std::istringstream is (std::string (b.data (), n));
+
+          is >> c; // '{'
+
+          for (c = static_cast<char> (is.peek ()); c != '}'; is >> c)
+          {
+            v.push_back (int ());
+            is >> v.back ();
+          }
+        }
+      }
+
+      static void
+      set_image (details::buffer& b,
+                 std::size_t& n,
+                 bool& is_null,
+                 const value_type& v)
+      {
+        is_null = false;
+        std::ostringstream os;
+
+        os << '{';
+
+        for (value_type::const_iterator i (v.begin ()), e (v.end ()); i != e;)
+        {
+          os << *i;
+
+          if (++i != e)
+            os << ',';
+        }
+
+        os << '}';
+
+        const std::string& s (os.str ());
+        n = s.size ();
+
+        if (n > b.capacity ())
+          b.capacity (n);
+
+        std::memcpy (b.data (), s.c_str (), n);
+      }
+    };
+
+    template <>
+    struct type_traits<std::vector<int> >
+    {
+      static const database_type_id db_type_id = id_string;
+
+      struct conversion
+      {
+        static const char* to () {return "(?)::INTEGER[]";}
+      };
+    };
+  }
+}
+
+#endif // TRAITS_HXX
-- 
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