1
22
23 package com.liferay.portlet.words.util;
24
25 import com.liferay.portlet.words.ScramblerException;
26 import com.liferay.portlet.words.util.comparator.WordComparator;
27
28 import java.util.Set;
29 import java.util.TreeSet;
30
31
37 public class Scrambler {
38
39 public Scrambler(String word) throws ScramblerException {
40 if (word == null || word.length() < 3) {
41 throw new ScramblerException();
42 }
43
44 _word = word;
45 _words = new TreeSet<String>(new WordComparator());
46 }
47
48 public String[] scramble() {
49 if (_word == null) {
50 return new String[0];
51 }
52
53 _scramble(0, _word.length(), _word.toCharArray());
54
55 return _words.toArray(new String[_words.size()]);
56 }
57
58 private void _rotate(char[] charArray, int start) {
59 char temp = charArray[start];
60
61 for (int i = charArray.length - start -1; i > 0; i--) {
62 charArray[start] = charArray[++start];
63 }
64
65 charArray[start] = temp;
66 }
67
68 private void _scramble(int start, int length, char[] charArray) {
69 if (length == 0) {
70 String word = new String(charArray);
71
72 for (int i = 3; i <= charArray.length; i++) {
73 _words.add(word.substring(0, i));
74 }
75 }
76 else {
77 for (int i = 0; i < length; i++) {
78 _scramble(start + 1, length - 1, charArray);
79 _rotate(charArray, start);
80 }
81 }
82 }
83
84 private String _word;
85 private Set<String> _words;
86
87 }