public Language exponentiaton(final Language language, final int exponent) {
Language result = new Language();
if (exponent == 0) {
result.addWord(EMPTY_WORD);
} else if (exponent == 1) {
cloneLanguage(language, result);
} else if (exponent > 1) {
Language aux = new Language();
String word = null;
cloneLanguage(language, aux);
for (int i = 1; i < exponent; i++) {
for (String word1 : aux.getWordList()) {
for (String word2 : language.getWordList()) {
word = word1.concat(word2);
if (!result.belongs(word)) {
result.addWord(word);
}
}
}
cloneLanguage(result, aux);
}
}
return result;
}
public Language union(final Language language1, final Language language2) {
Language result = new Language();
cloneLanguage(language1, result);
for (String word : language2.getWordList()) {
if (!result.belongs(word)) {
result.addWord(word);
}
}
if (result.getWordList().isEmpty()) {
result.addWord(EMPTY_LANGUAGE);
}
return result;
}
private Language star(final boolean isKleeneStar, final Language language, final int exponent) {
Language result = new Language();
Language aux = new Language();
if (isKleeneStar) {
result.addWord(EMPTY_WORD);
}
for (int i = 1; i <= exponent; i++) {
for (String word : union(result, exponentiaton(language, i)).getWordList()) {
aux.addWord(word);
}
result.getWordList().clear();
cloneLanguage(aux, result);
aux.getWordList().clear();
}
return result;
}
public Language reverse(final Language language) {
Language result = new Language();
String word = "";
for (String wordAux : language.getWordList()) {
for (int i = wordAux.length() - 1; i >= 0; i--) {
word = word.concat(String.valueOf(wordAux.charAt(i)));
}
result.addWord(word);
word = "";
}
return result;
}
/**
* Creates a new Language and adds it into the Collection.
*
* @param words Words of the language that will be created.
* @throws JOpLenException If something goes wrong.
*/
public void newLanguage(String[] words) throws JOpLenException {
Language language = new Language();
for (String word : words) {
if (belongsToAlphabet(word)) {
language.addWord(word);
} else {
throw new JOpLenException(
"Los símbolos de la palabra '" + word + "' no pertenecen al alfabeto");
}
}
language.setName(NameFactory.getInstance().getLanguageName());
addLanguage(language);
}
public Language product(final Language language1, final Language language2) {
Language result = new Language();
String word = null;
for (String word1 : language1.getWordList()) {
for (String word2 : language2.getWordList()) {
word = word1.concat(word2);
if (!result.belongs(word)) {
result.addWord(word);
}
}
}
return result;
}
