01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: 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.internal.fieldindex;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25: import com.db4o.internal.btree.*;
26: import com.db4o.internal.query.processor.*;
27:
28: public class FieldIndexProcessorResult {
29:
30: public static final FieldIndexProcessorResult NO_INDEX_FOUND = new FieldIndexProcessorResult(
31: null);
32:
33: public static final FieldIndexProcessorResult FOUND_INDEX_BUT_NO_MATCH = new FieldIndexProcessorResult(
34: null);
35:
36: private final IndexedNode _indexedNode;
37:
38: public FieldIndexProcessorResult(IndexedNode indexedNode) {
39: _indexedNode = indexedNode;
40: }
41:
42: public Tree toQCandidate(QCandidates candidates) {
43: return TreeInt.toQCandidate(toTreeInt(), candidates);
44: }
45:
46: public TreeInt toTreeInt() {
47: if (foundMatch()) {
48: return _indexedNode.toTreeInt();
49: }
50: return null;
51: }
52:
53: public boolean foundMatch() {
54: return foundIndex() && !noMatch();
55: }
56:
57: public boolean foundIndex() {
58: return this != NO_INDEX_FOUND;
59: }
60:
61: public boolean noMatch() {
62: return this == FOUND_INDEX_BUT_NO_MATCH;
63: }
64:
65: public Iterator4 iterateIDs() {
66: return new MappingIterator(_indexedNode.iterator()) {
67: protected Object map(Object current) {
68: FieldIndexKey composite = (FieldIndexKey) current;
69: return new Integer(composite.parentID());
70: }
71: };
72: }
73:
74: }
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