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


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.Field;
27
28 /**
29  * A PropagatedField is a Field that takes its value from Fields of the
30  * children query trees (called previous fields).
31  * @author Sebastien Chassande-Barrioz
32  */
33 public interface PropagatedField extends QueryTreeField {
34
35     Field[] getPreviousFields();
36
37     Field[] getPreviousFields(String JavaDoc oldFieldName);
38
39     Field[] getOriginFields();
40
41     /**
42      * The index of this Field in the array made of the concatenation of the
43      * tuples from the children QueryTrees.
44      * This information is used to pick the right value at evaluation time
45      * from this concatenated tuple to put it in the result Tuple.
46      */
47     int getIndex();
48
49     void setIndex(int idx);
50
51     void replacePreviousField(Field[] neo);
52 }
53
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