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