SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// Multi-Phasic Applications: 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;

/**
 * Wraps weak hash map entry keys.
 *
 * @param <K> The key type.
 * @param <V> The value stored.
 * @since 2023/02/09
 */
final class __WeakHashMapEntry__<K, V>
    implements Map.Entry<K, V>
{
    /** The entry used. */
    private final Map.Entry<__WeakHashMapKey__<K>, V> _entry;
    
    /** The key used. */
    private final K _key;
    
    /**
     * Initializes the entry wrapper.
     * 
     * @param __key The key used.
     * @param __entry The entry used.
     * @throws NullPointerException On null arguments.
     * @since 2023/02/09
     */
    __WeakHashMapEntry__(K __key, Map.Entry<__WeakHashMapKey__<K>, V> __entry)
        throws NullPointerException
    {
        if (__entry == null)
            throw new NullPointerException("NARG");
        
        this._key = __key;
        this._entry = __entry;
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/02/09
     */
    @Override
    public final boolean equals(Object __o)
    {
        if (__o == this)
            return true;
        
        if (!(__o instanceof Map.Entry))
            return false;
        
        Map.Entry<?, ?> o = (Map.Entry<?, ?>)__o;
        return Objects.equals(this.getKey(), o.getKey()) &&
            Objects.equals(this.getValue(), o.getValue());
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/02/09
     */
    @Override
    public final int hashCode()
    {
        K key = this.getKey();
        V value = this.getValue();
        return (key == null ? 0 : key.hashCode()) ^
            (value == null ? 0 : value.hashCode());
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/02/09
     */
    @Override
    public K getKey()
    {
        return this._key;
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/02/09
     */
    @Override
    public V getValue()
    {
        return this._entry.getValue();
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/02/09
     */
    @Override
    public V setValue(V __v)
    {
        return this._entry.setValue(__v);
    }
}