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.handlers;
22:
23: import com.db4o.*;
24: import com.db4o.internal.*;
25: import com.db4o.internal.marshall.*;
26: import com.db4o.internal.query.processor.*;
27: import com.db4o.marshall.*;
28:
29: /**
30: * @exclude
31: */
32: public class ArrayHandler0 extends ArrayHandler {
33:
34: public ArrayHandler0(TypeHandler4 template) {
35: super (template);
36: }
37:
38: public void readCandidates(int handlerVersion, Buffer reader,
39: QCandidates candidates) throws Db4oIOException {
40: Transaction transaction = candidates.transaction();
41: Buffer arrayBuffer = reader.readEmbeddedObject(transaction);
42: if (Deploy.debug) {
43: arrayBuffer.readBegin(identifier());
44: }
45: int count = elementCount(transaction, arrayBuffer);
46: for (int i = 0; i < count; i++) {
47: candidates.addByIdentity(new QCandidate(candidates, null,
48: arrayBuffer.readInt(), true));
49: }
50: }
51:
52: public Object read(ReadContext readContext) {
53:
54: InternalReadContext context = (InternalReadContext) readContext;
55:
56: Buffer buffer = readIndirectedBuffer(context);
57: if (buffer == null) {
58: return null;
59: }
60:
61: // With the following line we ask the context to work with
62: // a different buffer. Should this logic ever be needed by
63: // a user handler, it should be implemented by using a Queue
64: // in the UnmarshallingContext.
65:
66: // The buffer has to be set back from the outside! See below
67: Buffer contextBuffer = context.buffer(buffer);
68:
69: Object array = super .read(context);
70:
71: // The context buffer has to be set back.
72: context.buffer(contextBuffer);
73:
74: return array;
75: }
76: }
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