01: /**
02: * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
03: *
04: * Permission is hereby granted, free of charge, to any person obtaining a copy
05: * of this software and associated documentation files (the "Software"), to deal
06: * in the Software without restriction, including without limitation the rights
07: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08: * copies of the Software, and to permit persons to whom the Software is
09: * furnished to do so, subject to the following conditions:
10: *
11: * The above copyright notice and this permission notice shall be included in
12: * all copies or substantial portions of the Software.
13: *
14: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17: * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20: * SOFTWARE.
21: */package com.liferay.portlet.words.util;
22:
23: import com.liferay.portlet.words.ScramblerException;
24: import com.liferay.portlet.words.util.comparator.WordComparator;
25:
26: import java.util.Set;
27: import java.util.TreeSet;
28:
29: /**
30: * <a href="Scrambler.java.html"><b><i>View Source</i></b></a>
31: *
32: * @author Brian Wing Shun Chan
33: *
34: */
35: public class Scrambler {
36:
37: public Scrambler(String word) throws ScramblerException {
38: if (word == null || word.length() < 3) {
39: throw new ScramblerException();
40: }
41:
42: _word = word;
43: _words = new TreeSet(new WordComparator());
44: }
45:
46: public String[] scramble() {
47: if (_word == null) {
48: return new String[0];
49: }
50:
51: _scramble(0, _word.length(), _word.toCharArray());
52:
53: return (String[]) _words.toArray(new String[0]);
54: }
55:
56: private void _rotate(char[] charArray, int start) {
57: char temp = charArray[start];
58:
59: for (int i = charArray.length - start - 1; i > 0; i--) {
60: charArray[start] = charArray[++start];
61: }
62:
63: charArray[start] = temp;
64: }
65:
66: private void _scramble(int start, int length, char[] charArray) {
67: if (length == 0) {
68: String word = new String(charArray);
69:
70: for (int i = 3; i <= charArray.length; i++) {
71: _words.add(word.substring(0, i));
72: }
73: } else {
74: for (int i = 0; i < length; i++) {
75: _scramble(start + 1, length - 1, charArray);
76: _rotate(charArray, start);
77: }
78: }
79: }
80:
81: private String _word;
82: private Set _words;
83:
84: }
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