1 /*
2 * Copyright (c) 2004, Henri Yandell
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or
6 * without modification, are permitted provided that the
7 * following conditions are met:
8 *
9 * + Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * + Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * + Neither the name of OSJava nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 package org.osjava.taglib.trail;
34
35 import java.util.List;
36 import java.util.ArrayList;
37 import java.util.Iterator;
38
39 public class BreadCrumbs {
40
41 private List trail = new ArrayList();
42 private List normalizedTrail = new ArrayList();
43
44 // needs lots of thought, this current version breaks after
45 // the first norm
46
47 // i need to be able to look at the http-referer too
48 // if someone hits back once or twice etc, then chooses a
49 // sibling, i have to be able to see that
50
51 // also have to fix the .do/.jsp problem. servlet filter?
52
53 public void addToTrail(String referer, BreadCrumb bc) {
54 trail.add(bc);
55
56 // if crumb equals last crumb, do not add to norm
57 if( !normalizedTrail.isEmpty() ) {
58 BreadCrumb last = (BreadCrumb) normalizedTrail.get( normalizedTrail.size() - 1 );
59 if(bc.equals(last)) {
60 return;
61 }
62 }
63
64 // if crumb can be found in the trail, remove all entries
65 // after the crumb, and don't add to norm
66 if(normalizedTrail.contains(bc)) {
67 int idx = normalizedTrail.indexOf(bc);
68 normalizedTrail = normalizedTrail.subList(0, idx + 1);
69 return;
70 }
71
72 // if crumb's referer can be found in the trail, remove
73 // all entries after the crumb's referer, then add to norm
74 if(referer != null) {
75 Iterator itr = normalizedTrail.iterator();
76 while(itr.hasNext()) {
77 BreadCrumb tmp = (BreadCrumb) itr.next();
78 if(tmp.getUrl().equals(referer)) {
79 int idx = normalizedTrail.indexOf(tmp);
80 normalizedTrail = normalizedTrail.subList(0, idx + 1);
81 break;
82 }
83 }
84 }
85
86 normalizedTrail.add( bc );
87 }
88
89 public Iterator iterateTrail() {
90 return trail.iterator();
91 }
92
93 public Iterator iterateNormalizedTrail() {
94 return normalizedTrail.iterator();
95 }
96
97 }
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