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1
11 package org.eclipse.jdt.internal.ui.packageview;
12
13 import org.eclipse.jface.util.Assert;
14 import org.eclipse.jface.viewers.IElementComparer;
15
16
22 public final class TreePath {
23 private Object  [] fSegments;
24 private int fHash;
25
26 public TreePath(Object [] segments) {
27 Assert.isNotNull(segments);
28 for (int i= 0; i < segments.length; i++) {
29 Assert.isNotNull(segments[i]);
30 }
31 fSegments= segments;
32 }
33
34 public Object getSegment(int index) {
35 return fSegments[index];
36 }
37
38 public int getSegmentCount() {
39 return fSegments.length;
40 }
41
42 public Object getFirstSegment() {
43 if (fSegments.length == 0)
44 return null;
45 return fSegments[0];
46 }
47
48 public Object getLastSegment() {
49 if (fSegments.length == 0)
50 return null;
51 return fSegments[fSegments.length - 1];
52 }
53
54 public boolean equals(Object other) {
55 if (!(other instanceof TreePath))
56 return false;
57 TreePath otherPath= (TreePath)other;
58 if (fSegments.length != otherPath.fSegments.length)
59 return false;
60 for (int i= 0; i < fSegments.length; i++) {
61 if (!fSegments[i].equals(otherPath.fSegments[i]))
62 return false;
63 }
64 return true;
65 }
66
67 public int hashCode() {
68 if (fHash != 0)
69 return fHash;
70 for (int i= 0; i < fSegments.length; i++) {
71 fHash= fHash + fSegments[i].hashCode();
72 }
73 return fHash;
74 }
75
76 public boolean equals(TreePath otherPath, IElementComparer comparer) {
77 if (comparer == null)
78 comparer= DefaultElementComparer.INSTANCE;
79 if (otherPath == null)
80 return false;
81 if (fSegments.length != otherPath.fSegments.length)
82 return false;
83 for (int i= 0; i < fSegments.length; i++) {
84 if (!comparer.equals(fSegments[i], otherPath.fSegments[i]))
85 return false;
86 }
87 return true;
88 }
89 }
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