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Stream API from Java 8 rewrited on iterators for Java 7 and below.

There is a newer version: 1.2.2

package com.annimon.stream;

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 *
 * @author aNNiMON
 */
abstract class LsaIterator implements Iterator {
 
    @Override
    public void remove() {
        throw new UnsupportedOperationException("remove not supported");
    }

    @Override
    public final T next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        return nextIteration();
    }

    public abstract T nextIteration();
}