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// Copyright (c) 2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
namespace MySql.Data.Entity
{
class Scope
{
private Dictionary<string, InputFragment> scopeTable = new Dictionary<string, InputFragment>();
public void Add(string name, InputFragment fragment)
{
scopeTable.Add(name, fragment);
}
public void Remove(InputFragment fragment)
{
if (fragment == null) return;
if (fragment.Name != null)
scopeTable.Remove(fragment.Name);
if (fragment is SelectStatement)
Remove((fragment as SelectStatement).From);
else if (fragment is JoinFragment)
{
JoinFragment j = fragment as JoinFragment;
Remove(j.Left);
Remove(j.Right);
}
else if (fragment is UnionFragment)
{
UnionFragment u = fragment as UnionFragment;
Remove(u.Left);
Remove(u.Right);
}
}
public InputFragment GetFragment(string name)
{
if (!scopeTable.ContainsKey(name))
return null;
return scopeTable[name];
}
public InputFragment FindInputFromProperties(PropertyFragment fragment)
{
Debug.Assert(fragment != null);
PropertyFragment propertyFragment = fragment as PropertyFragment;
Debug.Assert(propertyFragment != null);
if (propertyFragment.Properties.Count >= 2)
{
for (int x = propertyFragment.Properties.Count - 2; x >= 0; x--)
{
string reference = propertyFragment.Properties[x];
InputFragment input = GetFragment(reference);
if (input == null) continue;
if (input.Scoped) return input;
if (input is SelectStatement)
return (input as SelectStatement).From;
continue;
}
}
Debug.Fail("Should have found an input");
return null;
}
}
}
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