/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.me.storage;


import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import appeng.api.networking.storage.IStackWatcher;
import appeng.api.networking.storage.IStackWatcherHost;
import appeng.api.storage.data.IAEStack;
import appeng.me.cache.GridStorageCache;


/**
 * Maintain my interests, and a global watch list, they should always be fully synchronized.
 */
public class ItemWatcher implements IStackWatcher
{

	private final GridStorageCache gsc;
	private final IStackWatcherHost myObject;
	private final Set<IAEStack> myInterests = new HashSet<IAEStack>();

	public ItemWatcher( final GridStorageCache cache, final IStackWatcherHost host )
	{
		this.gsc = cache;
		this.myObject = host;
	}

	public IStackWatcherHost getHost()
	{
		return this.myObject;
	}

	@Override
	public boolean add( final IAEStack e )
	{
		if( this.myInterests.contains( e ) )
		{
			return false;
		}

		return this.myInterests.add( e.copy() ) && this.gsc.getInterestManager().put( e, this );
	}

	@Override
	public boolean remove( final IAEStack o )
	{
		return this.myInterests.remove( o ) && this.gsc.getInterestManager().remove( (IAEStack) o, this );
	}

	@Override
	public void reset()
	{
		final Iterator<IAEStack> i = this.myInterests.iterator();

		while( i.hasNext() )
		{
			this.gsc.getInterestManager().remove( i.next(), this );
			i.remove();
		}
	}
}