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11 package org.eclipse.team.internal.ccvs.ui;
12
13
14 import java.util.ArrayList  ;
15 import java.util.Iterator ;
16 import java.util.List ;
17
18
21 public class VersionCollator {
22 public int compare(String revision1, String revision2) {
23 if (revision1 == null && revision2 == null) return 0;
24 if (revision1 == null) return -1;
25 if (revision2 == null) return 1;
26 int[] revision1Segments = getIntSegments(revision1);
27 int[] revision2Segments = getIntSegments(revision2);
28 for (int i = 0; i < revision1Segments.length && i < revision2Segments.length; i++) {
29 int i1 = revision1Segments[i];
30 int i2 = revision2Segments[i];
31 if (i1 != i2) {
32 return i1 > i2 ? 1 : -1;
33 }
34 }
35 if (revision1Segments.length != revision2Segments.length) {
36 return revision1Segments.length > revision2Segments.length ? 1 : -1;
37 }
38 return 0;
39 }
40
41 int[] getIntSegments(String string) {
42 int size = string.length();
43 if (size == 0) return new int[0];
44 StringBuffer buffer = new StringBuffer ();
45 List list = new ArrayList ();
46 for (int i = 0; i < size; i++) {
47 char ch = string.charAt(i);
48 if (ch == '.') {
49 list.add(new Integer (buffer.toString()));
50 buffer = new StringBuffer ();
51 } else {
52 buffer.append(ch);
53 }
54 }
55 list.add(new Integer (buffer.toString()));
56 int[] result = new int[list.size()];
57 Iterator it = list.iterator();
58 for (int i = 0; i < result.length; i++) {
59 result[i] = ((Integer )it.next()).intValue();
60 }
61 return result;
62 }
63 }
64
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