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 java.util;

/**
 * Iterator over the cached set.
 *
 * @param <S> The class type.
 * @since 2018/12/06
 */
final class __ServiceLoaderCachedIterator__<S>
    implements Iterator<S>
{
    /** The search class. */
    private final Class<S> _search;
    
    /** The array to use for this. */
    private final Object[] _items;
    
    /** The next index. */
    private int _next;
    
    /**
     * Wraps the given array and provides an iterator of it.
     *
     * @param __s The search class.
     * @param __it The iterator to wrap.
     * @throws NullPointerException On null arguments.
     * @since 2018/12/06
     */
    __ServiceLoaderCachedIterator__(Class<S> __s, Object[] __it)
        throws NullPointerException
    {
        if (__s == null || __it == null)
            throw new NullPointerException("NARG");
        
        this._search = __s;
        this._items = __it;
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/12/06
     */
    @Override
    public final boolean hasNext()
    {
        return this._next < this._items.length;
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/12/06
     */
    @Override
    public final S next()
    {
        Object[] items = this._items;
        int next = this._next;
        
        // No more?
        if (next >= items.length)
            throw new NoSuchElementException("NSEE");
        
        // Get and iterator
        Object rv = items[next];
        this._next = next + 1;
        return this._search.cast(rv);
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/12/06
     */
    @Override
    public final void remove()
    {
        throw new UnsupportedOperationException("RORO");
    }
}