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;

/**
 * This is the value set for an abstract map.
 *
 * @param <K> The key type.
 * @param <V> The value type.
 * @since 2018/10/29
 */
final class __AbstractMapValues__<K, V>
    extends AbstractCollection<V>
{
    /** The backing map. */
    protected final Map<K, V> map;
    
    /**
     * Initializes the set.
     *
     * @param __map The backing map
     * @throws NullPointerException On null arguments.
     * @since 2018/11/01
     */
    __AbstractMapValues__(Map<K, V> __map)
        throws NullPointerException
    {
        if (__map == null)
            throw new NullPointerException("NARG");
        
        this.map = __map;
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/11/01
     */
    @Override
    public final boolean contains(Object __o)
    {
        return this.map.containsValue(__o);
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/10/19
     */
    @Override
    public final Iterator<V> iterator()
    {
        return new __Iterator__<K, V>(this.map.entrySet().iterator());
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/10/19
     */
    @Override
    public final int size()
    {
        return this.map.size();
    }
    
    /**
     * This is the iterator over the map's value set.
     *
     * @param <K> The key type.
     * @param <V> The value type.
     * @since 2018/11/01
     */
    static final class __Iterator__<K, V>
        implements Iterator<V>
    {
        /** The entry set iterator. */
        protected final Iterator<Map.Entry<K, V>> iterator;
        
        /**
         * Initializes the iterator.
         *
         * @param __it The backing iterator.
         * @throws NullPointerException On null arguments.
         * @since 2018/11/01
         */
        __Iterator__(Iterator<Map.Entry<K, V>> __it)
            throws NullPointerException
        {
            if (__it == null)
                throw new NullPointerException("NARG");
            
            this.iterator = __it;
        }
        
        /**
         * {@inheritDoc}
         * @since 2018/11/01
         */
        @Override
        public boolean hasNext()
        {
            return this.iterator.hasNext();
        }
        
        /**
         * {@inheritDoc}
         * @since 2018/11/01
         */
        @Override
        public V next()
            throws NoSuchElementException
        {
            return this.iterator.next().getValue();
        }
        
        /**
         * {@inheritDoc}
         * @since 2018/11/01
         */
        @Override
        public void remove()
        {
            this.iterator.remove();
        }
    }
}