SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package net.multiphasicapps.collections;

import java.util.Iterator;
import java.util.Map;

/**
 * An iterator over a key set view for identity maps.
 *
 * @param <K> The key type.
 * @param <V> The value type.
 * @since 2021/11/28
 */
final class __IdentityKeySetIterator__<K, V>
    implements Iterator<Map.Entry<K, V>>
{
    /** The iterator over map entries. */
    private final Iterator<Map.Entry<Identity<K>, V>> _iterator;
    
    /**
     * Initializes the iterator for identity items.
     * 
     * @param __iterator The iterator to move over.
     * @throws NullPointerException On null arguments.
     * @since 2021/11/28
     */
    __IdentityKeySetIterator__(
        Iterator<Map.Entry<Identity<K>, V>> __iterator)
        throws NullPointerException
    {
        if (__iterator == null)
            throw new NullPointerException("NARG");
        
        this._iterator = __iterator;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/11/28
     */
    @Override
    public boolean hasNext()
    {
        return this._iterator.hasNext();
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/11/28
     */
    @Override
    public Map.Entry<K, V> next()
    {
        return new __IdentityMapEntry__<K, V>(this._iterator.next());
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/11/28
     */
    @Override
    public void remove()
    {
        this._iterator.remove();
    }
}