org.jhotdraw8.icollection.impl.iteration.Iterators Maven / Gradle / Ivy
/*
* @(#)Iterators.java
* Copyright © 2023 The authors and contributors of JHotDraw. MIT License.
*/
package org.jhotdraw8.icollection.impl.iteration;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Provides static utility methods for iterators.
*
* @author Werner Randelshofer
*/
public class Iterators {
/**
* Don't let anyone instantiate this class.
*/
private Iterators() {
}
/**
* Creates a list from an {@code Iterable}.
* If the {@code Iterable} is a list, it is returned.
*
* @param the value type
* @param iterable the iterable
* @return the list
*/
public static List toList(Iterable iterable) {
if (iterable instanceof List) {
return (List) iterable;
}
ArrayList list = new ArrayList<>();
iterable.forEach(list::add);
return list;
}
public static Iterator unmodifiableIterator(Iterator iterator) {
return new Iterator<>() {
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public E next() {
return iterator.next();
}
};
}
}