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package eu.siacs.conversations.crypto.sasl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
/**
* A tokenizer for GS2 header strings
*/
public final class Tokenizer implements Iterator<String>, Iterable<String> {
private final List<String> parts;
private int index;
public Tokenizer(final byte[] challenge) {
final String challengeString = new String(challenge);
parts = new ArrayList<>(Arrays.asList(challengeString.split(",")));
// Trim parts.
for (int i = 0; i < parts.size(); i++) {
parts.set(i, parts.get(i).trim());
}
index = 0;
}
/**
* Returns true if there is at least one more element, false otherwise.
*
* @see #next
*/
@Override
public boolean hasNext() {
return parts.size() != index + 1;
}
/**
* Returns the next object and advances the iterator.
*
* @return the next object.
* @throws java.util.NoSuchElementException if there are no more elements.
* @see #hasNext
*/
@Override
public String next() {
if (hasNext()) {
return parts.get(index++);
} else {
throw new NoSuchElementException("No such element. Size is: " + parts.size());
}
}
/**
* Removes the last object returned by {@code next} from the collection.
* This method can only be called once between each call to {@code next}.
*
* @throws UnsupportedOperationException if removing is not supported by the collection being
* iterated.
* @throws IllegalStateException if {@code next} has not been called, or {@code remove} has
* already been called after the last call to {@code next}.
*/
@Override
public void remove() {
if(index <= 0) {
throw new IllegalStateException("You can't delete an element before first next() method call");
}
parts.remove(--index);
}
/**
* Returns an {@link java.util.Iterator} for the elements in this object.
*
* @return An {@code Iterator} instance.
*/
@Override
public Iterator<String> iterator() {
return parts.iterator();
}
}
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