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.btree.algebra;
22:
23: import com.db4o.internal.btree.*;
24:
25: /**
26: * @exclude
27: */
28: public abstract class BTreeRangeOperation implements BTreeRangeVisitor {
29:
30: private BTreeRange _resultingRange;
31:
32: public BTreeRangeOperation() {
33: super ();
34: }
35:
36: public BTreeRange dispatch(BTreeRange range) {
37: range.accept(this );
38: return _resultingRange;
39: }
40:
41: public final void visit(BTreeRangeSingle single) {
42: _resultingRange = execute(single);
43: }
44:
45: public final void visit(BTreeRangeUnion union) {
46: _resultingRange = execute(union);
47: }
48:
49: protected abstract BTreeRange execute(BTreeRangeUnion union);
50:
51: protected abstract BTreeRange execute(BTreeRangeSingle single);
52:
53: }
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