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Java > Open Source Codes > org > objectweb > medor > eval > api > NodeEvaluatorFactory


1 /**
2  * MEDOR: Middleware Enabling Distributed Object Requests
3  *
4  * Copyright (C) 2001-2004 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.eval.api;
25
26 import org.objectweb.medor.api.MedorException;
27 import org.objectweb.medor.query.api.QueryNode;
28
29 /**
30  * This interface creates the controller object for the evaluation of a given
31  * QueryNode within a QueryTree.
32  */
33 public interface NodeEvaluatorFactory {
34
35     /**
36      * This methods creates a NodeEvaluator.
37      * It chooses the right implementation depending on the type of operation,
38      * the EvaluationMetaData associated to the QueryNode.
39      * It does not create NodeEvaluators for the children QueryNodes of the
40      * parameter QueryNode. It is up to the Evaluator to call the Factory
41      * for creating NodeEvaluators for the subnodes.
42      * @param node: the QueryNode for which the NodeEvaluator is created
43      * @param subEvaluators: the NodeEvaluators for the children QueryTrees
44      * of the QueryNode.
45      * @param evaluationMetaData: the evaluation meta data associated with the
46      * QueryNode.
47      */
48     NodeEvaluator createNodeEvaluator(QueryNode node,
49                                       NodeEvaluator[] subEvaluators,
50                                       EvaluationMetaData evaluationMetaData)
51             throws MedorException;
52 }
53
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