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package org.unicode.cldr.util;
import java.util.Iterator;
import java.util.NoSuchElementException;
public class DelegatingIterator<T> implements Iterator<T> {
private Iterator<T>[] iterators;
private int item = 0;
@SuppressWarnings("unchecked")
public DelegatingIterator(Iterator<T>... iterators) {
this.iterators = iterators;
}
public boolean hasNext() {
while (item < iterators.length) {
boolean result = iterators[item].hasNext();
if (result) {
return true;
}
++item;
}
return false;
}
public T next() {
while (item < iterators.length) {
try {
return iterators[item].next();
} catch (NoSuchElementException e) {
++item;
}
}
throw new NoSuchElementException();
}
public void remove() {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
public static <T> Iterable<T> iterable(Iterable<T>... s) {
return new MyIterable<T>(s);
}
@SuppressWarnings("unchecked")
public static <T> T[] array(T... s) {
return s;
}
private static class MyIterable<T> implements Iterable<T> {
public Iterable<T>[] iterables;
@SuppressWarnings("unchecked")
public MyIterable(Iterable<T>... s) {
iterables = s;
}
@SuppressWarnings("unchecked")
public Iterator<T> iterator() {
Iterator<T>[] iterators = new Iterator[iterables.length];
for (int i = 0; i < iterables.length; ++i) {
iterators[i] = iterables[i].iterator();
}
return new DelegatingIterator<T>(iterators);
}
}
}
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