01: /*
02: * hgcommons 7
03: * Hammurapi Group Common Library
04: * Copyright (C) 2003 Hammurapi Group
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: *
20: * URL: http://www.hammurapi.biz/hammurapi-biz/ef/xmenu/hammurapi-group/products/products/hgcommons/index.html
21: * e-Mail: support@hammurapi.biz
22: */
23: package biz.hammurapi.legacy.review;
24:
25: import java.util.Comparator;
26:
27: /**
28: * @author Pavel Vlasov
29: * @version $Revision: 1.3 $
30: */
31: public class SourceMarkerComparator implements Comparator {
32:
33: public static int _compare(Object o1, Object o2) {
34: if (o1 == null) {
35: return o2 == null ? 0 : 1;
36: } else if (o2 == null) {
37: return -1;
38: } else if (o1 instanceof SourceMarker
39: && o2 instanceof SourceMarker) {
40: SourceMarker sm1 = (SourceMarker) o1;
41: SourceMarker sm2 = (SourceMarker) o2;
42: int compareIds = _compare(sm1.getSourceId(), sm2
43: .getSourceId());
44: if (compareIds == 0) {
45: int compareSourceURLs = _compare(sm1.getSourceURL(),
46: sm2.getSourceURL());
47: if (compareSourceURLs == 0) {
48: return comparePosition(sm1, sm2);
49: } else {
50: return compareSourceURLs;
51: }
52: } else {
53: return compareIds;
54: }
55: } else if (o1 instanceof Comparable) {
56: return ((Comparable) o1).compareTo(o2);
57: } else {
58: throw new UnsupportedOperationException(
59: "Comparision of objects other than SourceMarker is not supported");
60: }
61: }
62:
63: private static int comparePosition(SourceMarker sm1,
64: SourceMarker sm2) {
65: if (sm1.getLine() == sm2.getLine()) {
66: return sm1.getColumn() - sm2.getColumn();
67: } else {
68: return sm1.getLine() - sm2.getLine();
69: }
70: }
71:
72: public int compare(Object o1, Object o2) {
73: return _compare(o1, o2);
74: }
75: }
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