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106 lines
3.3 KiB
C#
106 lines
3.3 KiB
C#
// Copyright © 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Diagnostics;
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namespace MySql.Data.Entity
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{
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class Scope
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{
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private Dictionary<string, InputFragment> scopeTable = new Dictionary<string, InputFragment>();
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public void Add(string name, InputFragment fragment)
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{
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scopeTable.Add(name, fragment);
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}
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public void Remove( string Name, InputFragment fragment)
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{
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if (fragment == null) return;
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if (Name != null)
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scopeTable.Remove(Name);
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if (fragment is SelectStatement)
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Remove((fragment as SelectStatement).From);
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else if (fragment is JoinFragment)
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{
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JoinFragment j = fragment as JoinFragment;
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Remove(j.Left);
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Remove(j.Right);
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}
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else if (fragment is UnionFragment)
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{
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UnionFragment u = fragment as UnionFragment;
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Remove(u.Left);
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Remove(u.Right);
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}
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}
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public void Remove(InputFragment fragment)
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{
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if( fragment == null ) return;
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Remove(fragment.Name, fragment);
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}
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public InputFragment GetFragment(string name)
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{
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if (!scopeTable.ContainsKey(name))
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return null;
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return scopeTable[name];
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}
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public InputFragment FindInputFromProperties(PropertyFragment fragment)
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{
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Debug.Assert(fragment != null);
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PropertyFragment propertyFragment = fragment as PropertyFragment;
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Debug.Assert(propertyFragment != null);
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if (propertyFragment.Properties.Count >= 2)
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{
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for (int x = propertyFragment.Properties.Count - 2; x >= 0; x--)
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{
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string reference = propertyFragment.Properties[x];
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if (reference == null) continue;
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InputFragment input = GetFragment(reference);
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if (input == null) continue;
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if (input.Scoped) return input;
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if (input is SelectStatement)
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return (input as SelectStatement).From;
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continue;
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}
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}
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Debug.Fail("Should have found an input");
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return null;
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}
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}
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public enum OpType : int
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{
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Join = 1,
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Union = 2
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}
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}
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