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Collections utilities used in various Yandex projects

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package ru.yandex.bolts.collection.impl;

import java.util.Iterator;

import ru.yandex.bolts.collection.IteratorF;
import ru.yandex.bolts.collection.Unmodifiable;


public class UnmodifiableDefaultIteratorF extends DefaultIteratorF implements Unmodifiable {
    protected UnmodifiableDefaultIteratorF(Iterator target) {
        super(target);
    }

    public IteratorF unmodifiable() {
        return this;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException("immutable");
    }

    public static  IteratorF wrap(Iterator iterator) {
        if (iterator instanceof IteratorF && iterator instanceof Unmodifiable) return (IteratorF) iterator;
        else return new UnmodifiableDefaultIteratorF<>(iterator);
    }
} //~