/**
* Copyright (c) 2000-2005 Liferay, LLC. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.liferay.portlet.words.util;
import java.util.Set;
import java.util.TreeSet;
import com.liferay.portlet.words.ScramblerException;
/**
* <a href="Scrambler.java.html"><b><i>View Source</i></b></a>
*
* @author Brian Wing Shun Chan
* @version $Revision: 1.4 $
*
*/
public class Scrambler {
public Scrambler(String word) throws ScramblerException {
if (word == null || word.length() < 3) {
throw new ScramblerException();
}
_word = word;
_words = new TreeSet(new WordComparator());
}
public String[] scramble() {
if (_word == null) {
return new String[0];
}
_scramble(0, _word.length(), _word.toCharArray());
return (String[])_words.toArray(new String[0]);
}
private void _rotate(char[] charArray, int start) {
char temp = charArray[start];
for (int i = charArray.length - start -1; i > 0; i--) {
charArray[start] = charArray[++start];
}
charArray[start] = temp;
}
private void _scramble(int start, int length, char[] charArray) {
if (length == 0) {
String word = new String(charArray);
for (int i = 3; i <= charArray.length; i++) {
_words.add(word.substring(0, i));
}
}
else {
for (int i = 0; i < length; i++) {
_scramble(start + 1, length - 1, charArray);
_rotate(charArray, start);
}
}
}
private String _word;
private Set _words;
}