com.comphenix.protocol.compat.netty.independent.NettyBootstrapList.java Source code

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Here is the source code for com.comphenix.protocol.compat.netty.independent.NettyBootstrapList.java

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/**
 *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
 *  Copyright (C) 2015 dmulloy2
 *
 *  This program is free software; you can redistribute it and/or modify it under the terms of the
 *  GNU General Public License as published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with this program;
 *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307 USA
 */
package com.comphenix.protocol.compat.netty.independent;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandler;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.concurrent.Callable;

import com.google.common.collect.Lists;

public class NettyBootstrapList implements List<Object> {
    private List<Object> delegate;
    private ChannelHandler handler;

    /**
     * Construct a new bootstrap list.
     * @param delegate - the delegate.
     * @param handler - the channel handler to add.
     */
    public NettyBootstrapList(List<Object> delegate, ChannelHandler handler) {
        this.delegate = delegate;
        this.handler = handler;

        // Process all existing bootstraps
        for (Object item : this) {
            processElement(item);
        }
    }

    @Override
    public synchronized boolean add(Object element) {
        processElement(element);
        return delegate.add(element);
    }

    @Override
    public synchronized boolean addAll(Collection<? extends Object> collection) {
        List<Object> copy = Lists.newArrayList(collection);

        // Process the collection before we pass it on
        for (Object element : copy) {
            processElement(element);
        }
        return delegate.addAll(copy);
    }

    @Override
    public synchronized Object set(int index, Object element) {
        Object old = delegate.set(index, element);

        // Handle the old future, and the newly inserted future
        if (old != element) {
            unprocessElement(old);
            processElement(element);
        }
        return old;
    }

    /**
     * Process a single element.
     * @param element - the element.
     */
    protected void processElement(Object element) {
        if (element instanceof ChannelFuture) {
            processBootstrap((ChannelFuture) element);
        }
    }

    /**
     * Unprocess a single element.
     * @param element - the element to unprocess.
     */
    protected void unprocessElement(Object element) {
        if (element instanceof ChannelFuture) {
            unprocessBootstrap((ChannelFuture) element);
        }
    }

    /**
     * Process a single channel future.
     * @param future - the future.
     */
    protected void processBootstrap(ChannelFuture future) {
        // Important: Must be addFirst()
        future.channel().pipeline().addFirst(handler);
    }

    /**
     * Revert any changes we made to the channel future.
     * @param future - the future.
     */
    protected void unprocessBootstrap(ChannelFuture future) {
        final Channel channel = future.channel();

        // For thread safety - see ChannelInjector.close()
        channel.eventLoop().submit(new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                channel.pipeline().remove(handler);
                return null;
            }
        });
    }

    /**
     * Close and revert all changes.
     */
    public synchronized void close() {
        for (Object element : this)
            unprocessElement(element);
    }

    // Boiler plate
    @Override
    public synchronized int size() {
        return delegate.size();
    }

    @Override
    public synchronized boolean isEmpty() {
        return delegate.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return delegate.contains(o);
    }

    @Override
    public synchronized Iterator<Object> iterator() {
        return delegate.iterator();
    }

    @Override
    public synchronized Object[] toArray() {
        return delegate.toArray();
    }

    @Override
    public synchronized <T> T[] toArray(T[] a) {
        return delegate.toArray(a);
    }

    @Override
    public synchronized boolean remove(Object o) {
        return delegate.remove(o);
    }

    @Override
    public synchronized boolean containsAll(Collection<?> c) {
        return delegate.containsAll(c);
    }

    @Override
    public synchronized boolean addAll(int index, Collection<? extends Object> c) {
        return delegate.addAll(index, c);
    }

    @Override
    public synchronized boolean removeAll(Collection<?> c) {
        return delegate.removeAll(c);
    }

    @Override
    public synchronized boolean retainAll(Collection<?> c) {
        return delegate.retainAll(c);
    }

    @Override
    public synchronized void clear() {
        delegate.clear();
    }

    @Override
    public synchronized Object get(int index) {
        return delegate.get(index);
    }

    @Override
    public synchronized void add(int index, Object element) {
        delegate.add(index, element);
    }

    @Override
    public synchronized Object remove(int index) {
        return delegate.remove(index);
    }

    @Override
    public synchronized int indexOf(Object o) {
        return delegate.indexOf(o);
    }

    @Override
    public synchronized int lastIndexOf(Object o) {
        return delegate.lastIndexOf(o);
    }

    @Override
    public synchronized ListIterator<Object> listIterator() {
        return delegate.listIterator();
    }

    @Override
    public synchronized ListIterator<Object> listIterator(int index) {
        return delegate.listIterator(index);
    }

    @Override
    public synchronized List<Object> subList(int fromIndex, int toIndex) {
        return delegate.subList(fromIndex, toIndex);
    }
    // End boiler plate
}