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Java > Open Source Codes > org > objectweb > medor > query > api > QueryNodeFactory


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.query.api;
25
26 import org.objectweb.medor.api.TupleStructure;
27 import org.objectweb.medor.api.QueryNodeException;
28 import org.objectweb.medor.expression.api.Expression;
29
30 /**
31  * This interface is used for creating QueryNodes.
32  */
33 public interface QueryNodeFactory {
34
35     /**
36      * This methods creates the links between the children QueryTrees and
37      * the created QueryNode. It is used when building a QueryNode from existing
38      * QueryTrees.
39      * It typically verifies that all Fields defined in the tupleStructure are
40      * present in one of the children.
41      * It also propagates the indexes in the associated TupleLoaders for
42      * evaluation purposes.
43      */
44     QueryNode createQueryNode(QueryTree[] children, short OperationType,
45                               Expression filter, TupleStructure tupleStructure)
46         throws QueryNodeException;
47
48 }
49
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