@Override
public List<List<Node<String>>> search() {
boolean canStart = checkWords(wordsPair);
canStart &= checkDictionary(dictionary);
if (!canStart) {
return null;
}
Tree.Node<String> root = new Tree.Node<>();
root.setData(wordsPair[0]);
Tree<String> tree = new Tree<>();
tree.setRootElement(root);
String word = root.getItem();
dictionary.remove(word);
Node<String> currentNode = root;
List<Node<String>> nodes = new ArrayList<>();
while (!word.equals(wordsPair[1]) && currentNode != null) {
// потенциальные слова
List<String> words = generateCandidates(word);
// отсекаем слова, которых нет в словаре
for (Iterator<String> iterator = words.iterator(); iterator.hasNext(); ) {
String s = iterator.next();
if (!dictionary.contains(s)) {
iterator.remove();
}
}
// удаляем полученные слова из словаря (для исключения цикличности поиска)
for (String c : words) {
if (!c.equals(wordsPair[1])) {
dictionary.remove(c);
}
}
// формируем очередной уровень дерева
for (String c : words) {
Node<String> n = new Node<>(c);
currentNode.addChild(n);
if (c.equals(wordsPair[1])) {
nodes.add(n);
}
}
currentNode = tree.getNextElement(currentNode, !nodes.isEmpty());
if (currentNode != null) {
word = currentNode.getItem();
} else if (nodes.isEmpty()) {
return null;
}
}
return tree.getPaths(nodes);
}
public static void main(String[] args) throws IOException {
PrintWriter out = null;
if (args.length < 1) {
System.err.println("Usage: java Filter input [output]");
System.exit(2); // POSIX
} else if (args.length < 2)
// Optional arg: use stdout if no output file given.
out = new PrintWriter(System.out);
else
// Wrap a BufferedWriter around the FileWriter as it may be costly.
out = new PrintWriter(new BufferedWriter(new FileWriter(args[1])));
StreamTokenizer tokenizer = null;
String res = resourceLoc(args[0]);
try {
tokenizer = new StreamTokenizer(new FileReader(res));
tokenizer.lowerCaseMode(true);
} catch (FileNotFoundException e) {
System.err.printf("Input file %s was not found.\n", res);
System.exit(-1);
}
Dictionary dictionary = new Dictionary();
while (tokenizer.nextToken() != StreamTokenizer.TT_EOF) {
if (tokenizer.ttype == StreamTokenizer.TT_WORD && dictionary.contains(tokenizer.sval))
out.println(tokenizer.sval);
}
out.close();
}