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// file : odb/schema-catalog.cxx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <map>
#include <vector>
#include <cassert>
#include <odb/database.hxx>
#include <odb/exceptions.hxx>
#include <odb/schema-catalog.hxx>
#include <odb/schema-catalog-impl.hxx>
using namespace std;
namespace odb
{
typedef bool (*create_function) (database&, unsigned short pass, bool drop);
typedef bool (*migrate_function) (database&, unsigned short pass, bool pre);
typedef pair<database_id, string> key;
typedef vector<create_function> create_functions;
typedef vector<migrate_function> migrate_functions;
typedef map<schema_version, migrate_functions> version_map;
struct schema_functions
{
create_functions create;
version_map migrate;
};
struct schema_catalog_impl: map<key, schema_functions> {};
schema_catalog_impl* schema_catalog_init::catalog = 0;
size_t schema_catalog_init::count = 0;
bool schema_catalog::
exists (database_id id, const std::string& name)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
return c.find (key (id, name)) != c.end ();
}
void schema_catalog::
create_schema (database& db, const string& name, bool drop)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
schema_catalog_impl::const_iterator i (c.find (key (db.id (), name)));
if (i == c.end ())
throw unknown_schema (name);
const create_functions& fs (i->second.create);
if (drop)
drop_schema (db, name);
// Run the passes until we ran them all or all the functions
// return false, which means no more passes necessary.
//
for (unsigned short pass (1); pass < 3; ++pass)
{
bool done (true);
for (create_functions::const_iterator j (fs.begin ()), e (fs.end ());
j != e; ++j)
{
if ((*j) (db, pass, false))
done = false;
}
if (done)
break;
}
}
void schema_catalog::
drop_schema (database& db, const string& name)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
schema_catalog_impl::const_iterator i (c.find (key (db.id (), name)));
if (i == c.end ())
throw unknown_schema (name);
const create_functions& fs (i->second.create);
// Run the passes until we ran them all or all the functions
// return false, which means no more passes necessary.
//
for (unsigned short pass (1); pass < 3; ++pass)
{
bool done (true);
for (create_functions::const_iterator j (fs.begin ()), e (fs.end ());
j != e; ++j)
{
if ((*j) (db, pass, true))
done = false;
}
if (done)
break;
}
}
void schema_catalog::
migrate_schema_impl (database& db,
schema_version v,
const string& name,
migrate_mode m)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
schema_catalog_impl::const_iterator i (c.find (key (db.id (), name)));
if (i == c.end ())
throw unknown_schema (name);
const version_map& vm (i->second.migrate);
version_map::const_iterator j (vm.find (v));
if (j == vm.end ())
throw unknown_schema_version (v);
const migrate_functions& fs (j->second);
// Run the passes until we ran them all or all the functions
// return false, which means no more passes necessary.
//
for (bool pre (m != migrate_post);; pre = false)
{
for (unsigned short pass (1); pass < 3; ++pass)
{
bool done (true);
for (migrate_functions::const_iterator i (fs.begin ()), e (fs.end ());
i != e; ++i)
{
if ((*i) (db, pass, pre))
done = false;
}
if (done)
break;
}
if (!pre || m != migrate_both)
break;
}
// Update the schema version on the database instance.
//
db.schema_version (v, m == migrate_pre, name);
}
void schema_catalog::
migrate (database& db, schema_version v, const std::string& name)
{
schema_version latest (latest_version (db, name));
if (v == 0)
v = latest;
else if (v > latest)
throw unknown_schema_version (v);
for (schema_version i (next_version (db, 0, name));
i != 0 && i <= v;
i = next_version (db, i, name))
{
migrate_schema_pre (db, i, name);
// migrate_data (db, i, name);
migrate_schema_post (db, i, name);
}
}
schema_version schema_catalog::
next_version (database_id id, schema_version current, const string& name)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
schema_catalog_impl::const_iterator i (c.find (key (id, name)));
if (i == c.end ())
throw unknown_schema (name);
const version_map& vm (i->second.migrate);
version_map::const_iterator j (vm.upper_bound (current));
return j != vm.end () ? j->first : 0;
}
schema_version schema_catalog::
latest_version (database_id id, const string& name)
{
const schema_catalog_impl& c (*schema_catalog_init::catalog);
schema_catalog_impl::const_iterator i (c.find (key (id, name)));
if (i == c.end ())
throw unknown_schema (name);
const version_map& vm (i->second.migrate);
assert (!vm.empty ());
return vm.rbegin ()->first;
}
// schema_catalog_init
//
schema_catalog_init::
schema_catalog_init ()
{
if (count == 0)
catalog = new schema_catalog_impl;
++count;
}
schema_catalog_init::
~schema_catalog_init ()
{
if (--count == 0)
delete catalog;
}
// schema_catalog_create_entry
//
schema_catalog_create_entry::
schema_catalog_create_entry (database_id id,
const char* name,
create_function cf)
{
schema_catalog_impl& c (*schema_catalog_init::catalog);
c[key(id, name)].create.push_back (cf);
}
// schema_catalog_migrate_entry
//
schema_catalog_migrate_entry::
schema_catalog_migrate_entry (database_id id,
const char* name,
schema_version v,
migrate_function mf)
{
schema_catalog_impl& c (*schema_catalog_init::catalog);
c[key(id, name)].migrate[v].push_back (mf);
}
}
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