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Java > Open Source Codes > com > db4o > QPending


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

21 package com.db4o;
22
23 import com.db4o.foundation.*;
24
25 /**
26  * @exclude
27  */

28 class QPending extends Tree{
29     
30     final QConJoin _join;
31     QCon _constraint;
32     
33     int _result;
34
35     // Constants, so QConJoin.evaluatePending is made easy:
36
static final int FALSE = -4;
37     static final int BOTH = 1;
38     static final int TRUE = 2;
39     
40     QPending(QConJoin a_join, QCon a_constraint, boolean a_firstResult){
41         _join = a_join;
42         _constraint = a_constraint;
43         
44         _result = a_firstResult ? TRUE : FALSE;
45     }
46     
47     public int compare(Tree a_to) {
48         return _constraint.i_id - ((QPending)a_to)._constraint.i_id;
49     }
50
51     void changeConstraint(){
52         _constraint = _join.getOtherConstraint(_constraint);
53     }
54
55     public Object JavaDoc shallowClone() {
56         QPending pending = new QPending(_join, _constraint, false);
57         pending._result=_result;
58         super.shallowCloneInternal(pending);
59         return pending;
60     }
61     
62     public Object JavaDoc key(){
63         throw new NotImplementedException();
64     }
65
66 }
67
68
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