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Java > Open Source Codes > com > db4o > inside > fieldindex > JoinedLeaf


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.inside.fieldindex;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25 import com.db4o.inside.btree.*;
26
27 public class JoinedLeaf implements IndexedNodeWithRange {
28
29     private final QCon _constraint;
30     private final IndexedNodeWithRange _leaf1;
31     private final BTreeRange _range;
32     
33     public JoinedLeaf(final QCon constraint, final IndexedNodeWithRange leaf1, final BTreeRange range) {
34         if (null == constraint || null == leaf1 || null == range) {
35             throw new ArgumentNullException();
36         }
37         _constraint = constraint;
38         _leaf1 = leaf1;
39         _range = range;
40     }
41     
42     public QCon getConstraint() {
43         return _constraint;
44     }
45     
46     public BTreeRange getRange() {
47         return _range;
48     }
49
50     public Iterator4 iterator() {
51         return _range.keys();
52     }
53
54     public TreeInt toTreeInt() {
55         return IndexedNodeBase.addToTree(null, this);
56     }
57
58     public BTree getIndex() {
59         return _leaf1.getIndex();
60     }
61
62     public boolean isResolved() {
63         return _leaf1.isResolved();
64     }
65
66     public IndexedNode resolve() {
67         return IndexedPath.newParentPath(this, _constraint);
68     }
69
70     public int resultSize() {
71         return _range.size();
72     }
73 }
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