ArrayIterator.java

package com.osroyale.util;
 
import com.google.common.collect.PeekingIterator;
 
import java.util.ArrayList;
import java.util.Iterator;

public final class ArrayIterator<E> implements PeekingIterator<E> {

    private final E[] array;

    private int index;

    private int lastIndex = -1;

    public ArrayIterator(E[] array) {
        this.array = array;
    }
 
    @Override
    public boolean hasNext() {
        return !(index + 1 > array.length);
    }
 
    @Override
    public E peek() {
        return array[index];
    }
 
    @Override
    public E next() {
        if(index >= array.length)
            throw new ArrayIndexOutOfBoundsException("There are no elements left to iterate over!");
        lastIndex = index;
        index++;
        return array[lastIndex];
    }
 
    @Override
    public void remove() {
        if(lastIndex == -1)
            throw new IllegalStateException("This method can only be called once after \"next\".");
        array[lastIndex] = null;
        lastIndex = -1;
    }
}