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 cc.squirreljme.runtime.cldc.io;

import java.io.Closeable;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

/**
 * This is an {@link Appendable} which does not implement {@link Closeable}
 * but refers to the argument via a weak reference.
 *
 * @since 2022/06/23
 */
public final class NonClosedWeakAppendable
    implements Appendable
{
    /** The target appendable. */
    private final Reference<Appendable> _wrapped;
    
    /**
     * 
     * 
     * @param __wrapped The wrapped appendable.
     * @throws NullPointerException On null arguments.
     * @since 2022/06/23
     */
    public NonClosedWeakAppendable(Appendable __wrapped)
        throws NullPointerException
    {
        if (__wrapped == null)
            throw new NullPointerException("NARG");
        
        this._wrapped = new WeakReference<>(__wrapped);
    }
    
    /**
     * {@inheritDoc}
     * @since 2022/06/23
     */
    @Override
    public Appendable append(CharSequence __c)
        throws IOException
    {
        return this.__get().append(__c);
    }
    
    /**
     * {@inheritDoc}
     * @since 2022/06/23
     */
    @Override
    public Appendable append(CharSequence __c, int __s, int __e)
        throws IndexOutOfBoundsException, IOException
    {
        return this.__get().append(__c, __s, __e);
    }
    
    /**
     * {@inheritDoc}
     * @since 2022/06/23
     */
    @Override
    public Appendable append(char __c)
        throws IOException
    {
        return this.__get().append(__c);
    }
    
    /**
     * Returns the appendable.
     * 
     * @return The appendable.
     * @throws IllegalStateException If it was garbage collected.
     * @since 2022/06/23
     */
    private Appendable __get()
        throws IllegalStateException
    {
        Appendable rv = this._wrapped.get();
        if (rv == null)
            throw new IllegalStateException("GCGC");
        
        return rv;
    }
}