package com.comphenix.protocol.injector.netty;
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;
import net.minecraft.util.io.netty.channel.Channel;
// Hopefully, CB won't version these as well
import net.minecraft.util.io.netty.channel.ChannelFuture;
import net.minecraft.util.io.netty.channel.ChannelHandler;
class BootstrapList 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 BootstrapList(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
public synchronized int size() {
return delegate.size();
}
public synchronized boolean isEmpty() {
return delegate.isEmpty();
}
public boolean contains(Object o) {
return delegate.contains(o);
}
public synchronized Iterator<Object> iterator() {
return delegate.iterator();
}
public synchronized Object[] toArray() {
return delegate.toArray();
}
public synchronized <T> T[] toArray(T[] a) {
return delegate.toArray(a);
}
public synchronized boolean remove(Object o) {
return delegate.remove(o);
}
public synchronized boolean containsAll(Collection<?> c) {
return delegate.containsAll(c);
}
public synchronized boolean addAll(int index, Collection<? extends Object> c) {
return delegate.addAll(index, c);
}
public synchronized boolean removeAll(Collection<?> c) {
return delegate.removeAll(c);
}
public synchronized boolean retainAll(Collection<?> c) {
return delegate.retainAll(c);
}
public synchronized void clear() {
delegate.clear();
}
public synchronized Object get(int index) {
return delegate.get(index);
}
public synchronized void add(int index, Object element) {
delegate.add(index, element);
}
public synchronized Object remove(int index) {
return delegate.remove(index);
}
public synchronized int indexOf(Object o) {
return delegate.indexOf(o);
}
public synchronized int lastIndexOf(Object o) {
return delegate.lastIndexOf(o);
}
public synchronized ListIterator<Object> listIterator() {
return delegate.listIterator();
}
public synchronized ListIterator<Object> listIterator(int index) {
return delegate.listIterator(index);
}
public synchronized List<Object> subList(int fromIndex, int toIndex) {
return delegate.subList(fromIndex, toIndex);
}
// End boiler plate
}