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Java > Open Source Codes > org > objectweb > speedo > query > api > QueryManager


1 /**
2  * Speedo: an implementation of JDO compliant personality on top of JORM generic
3  * I/O sub-system.
4  * Copyright (C) 2001-2004 France Telecom R&D
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  *
21  *
22  * Contact: speedo@objectweb.org
23  *
24  * Authors: S.Chassande-Barrioz.
25  *
26  */
27
28 package org.objectweb.speedo.query.api;
29
30 import org.objectweb.speedo.query.api.QueryDefinition;
31
32 /**
33  * Is a manager of compiled query. It is responsible of CompiledQuery allocation
34  * and could implement a caching policy. The identifier of a query is a
35  * QueryDefinition.
36  *
37  * @author S.Chassande-Barrioz
38  */
39 public interface QueryManager {
40
41     /**
42      * Retrieves a CompiledQuery for a given QueryDefinition. The compiled query
43      * can be a new instance or not (caching).
44      *
45      * @param qd defines the expected query.
46      * @return a CompiledQuery instance (never null).
47      */
48     CompiledQuery getQueryCompiler(QueryDefinition qd);
49 }
50
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