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Java > Open Source Codes > org > objectweb > medor > query > lib > BasicQueryTree


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, S. Chassande-Barrioz
22  */
23
24 package org.objectweb.medor.query.lib;
25
26 import org.objectweb.medor.api.MedorException;
27 import org.objectweb.medor.api.TupleStructure;
28 import org.objectweb.medor.lib.BasicTupleStructure;
29 import org.objectweb.medor.query.api.OrderField;
30 import org.objectweb.medor.query.api.QueryTree;
31
32 import java.util.Map JavaDoc;
33
34 /**
35  * A BasicQueryNode is an implementation of QueryNode.
36  * It also implements QueryIndexGenerator and RWTupleStructure (it is its own
37  * TupleStructure).
38  * @author Sebastien Chassande-Barrioz
39  */
40 public abstract class BasicQueryTree extends BasicTupleStructure
41     implements QueryTree {
42
43     protected String JavaDoc name = null;
44     /**
45      * Contains ranges of attribute to be projected from the tuple resulting
46      * of the concatenation of the tuples from the children QueryTrees.
47      */
48     protected int[] indexes;
49
50     protected boolean distinct = false;
51
52     protected OrderField[] orderfields = null;
53
54     public BasicQueryTree() {
55     }
56
57     public BasicQueryTree(String JavaDoc _name) {
58         super();
59         this.name = _name;
60     }
61
62     public Object JavaDoc clone(Object JavaDoc clone,
63                         Map JavaDoc obj2clone) throws CloneNotSupportedException JavaDoc {
64         clone = super.clone(clone, obj2clone);
65         BasicQueryTree bqt = (BasicQueryTree) clone;
66         bqt.name = name;
67         bqt.distinct = distinct;
68         if (indexes != null) {
69             bqt.indexes = new int[indexes.length];
70             System.arraycopy(indexes, 0, bqt.indexes, 0, indexes.length);
71         }
72         if (orderfields != null) {
73             bqt.orderfields = new OrderField[orderfields.length];
74             for(int i=0; i<orderfields.length; i++) {
75                 bqt.orderfields[i] = (OrderField) getClone(orderfields[i],obj2clone);
76             }
77         }
78         return clone;
79     }
80
81     public String JavaDoc getName() {
82         return name;
83     }
84
85     public TupleStructure getTupleStructure() {
86         return this;
87     }
88
89     public void setDistinct(boolean distinct) throws MedorException {
90         this.distinct = distinct;
91     }
92
93     public boolean getDistinct() {
94         return distinct;
95     }
96
97     public void setOrderBy(OrderField[] orderfields) {
98         this.orderfields = orderfields;
99     }
100
101     public OrderField[] getOrderBy() {
102         return orderfields;
103     }
104 }
105
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