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Ultra-high performance non-blocking XML processor (Stax/Stax2, SAX/SAX2)

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package com.fasterxml.aalto.util;

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

/**
 * Simple read-only iterator that iterators over one specific item, passed
 * in as constructor argument.
 */
public final class SingletonIterator
    implements Iterator
{
    private final String _value;

    private boolean _done = false;

    public SingletonIterator(String value) {
        _value = value;
    }

    @Override
    public boolean hasNext() {
        return !_done;
    }

    @Override
    public String next() {
        if (_done) {
            throw new NoSuchElementException();
        }
        _done = true;
        return _value;
    }

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