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.cs;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25:
26: /**
27: * @exclude
28: */
29: public class LazyClientIdIterator implements IntIterator4 {
30:
31: private final LazyClientQueryResult _queryResult;
32:
33: private int _current;
34:
35: private int[] _ids;
36:
37: private final int _batchSize;
38:
39: private int _available;
40:
41: public LazyClientIdIterator(LazyClientQueryResult queryResult) {
42: _queryResult = queryResult;
43: _batchSize = queryResult.config().prefetchObjectCount();
44: _ids = new int[_batchSize];
45: _current = -1;
46: }
47:
48: public int currentInt() {
49: if (_current < 0) {
50: throw new IllegalStateException();
51: }
52: return _ids[_current];
53: }
54:
55: public Object current() {
56: return new Integer(currentInt());
57: }
58:
59: public boolean moveNext() {
60: if (_available < 0) {
61: return false;
62: }
63: if (_available == 0) {
64: _queryResult.fetchIDs(_batchSize);
65: _available--;
66: _current = 0;
67: return (_available > 0);
68: }
69: _current++;
70: _available--;
71: return true;
72: }
73:
74: public void reset() {
75: _queryResult.reset();
76: _available = 0;
77: _current = -1;
78: }
79:
80: public void loadFromIdReader(Buffer reader, int count) {
81: for (int i = 0; i < count; i++) {
82: _ids[i] = reader.readInt();
83: }
84: if (count > 0) {
85: _available = count;
86: return;
87: }
88: _available = -1;
89: }
90:
91: }
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