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Java > Open Source Codes > org > objectweb > medor > optim > api > QueryTransformer


1 /**
2  * MEDOR: Middleware Enabling Distributed Object Requests
3  *
4  * Copyright (C) 2001-2003 France Telecom R&D
5  * Contact: alexandre.lefebvre@rd.francetelecom.com
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * Initial developers: M. Alia, A. Lefebvre
22  */
23
24 package org.objectweb.medor.optim.api;
25 import org.objectweb.medor.query.api.QueryTree;
26 import org.objectweb.medor.api.MedorException;
27
28 /**
29  * This interface represents objects that manipulate query trees, such as
30  * a logical query rewriter, a query optimizer for choosing the right
31  * join algorithm, etc, and an executable query plan generator.
32  */
33 public interface QueryTransformer {
34     /**
35      * This methods transforms a QueryTree into another QueryTree.
36      */
37     QueryTree transform(QueryTree qt) throws MedorException;
38 }
39
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