/*
 * FilteredListFacade.java
 * Copyright 2011 Connor Petty <cpmeister@users.sourceforge.net>
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * Created on Jan 27, 2011, 11:36:59 PM
 */
package pcgen.gui2.filter;

import java.util.ArrayList;
import java.util.List;

import pcgen.facade.util.event.ListEvent;
import pcgen.facade.util.event.ListListener;
import pcgen.facade.util.AbstractListFacade;
import pcgen.facade.util.ListFacade;

/**
 *
 * @author Connor Petty <cpmeister@users.sourceforge.net>
 */
public class FilteredListFacade<C, E> extends AbstractListFacade<E> implements ListListener<E>
{

	private List<E> data = new ArrayList<>();
	private ListFacade<E> delegate = null;
	private Filter<? super C, ? super E> filter = null;
	private C context = null;

	@Override
	public E getElementAt(int index)
	{
		return data.get(index);
	}

	@Override
	public int getSize()
	{
		return data.size();
	}

	public void setContext(C context)
	{
		C oldContext = this.context;
		this.context = context;
		if (oldContext != context)
		{
			refilter();
		}
	}

	public void setFilter(Filter<? super C, ? super E> filter)
	{
		Filter<? super C, ? super E> oldFilter = this.filter;
		this.filter = filter;
		if (oldFilter != filter)
		{
			refilter();
		}
	}

	public void setDelegate(ListFacade<E> list)
	{
		ListFacade<E> oldList = this.delegate;
		if (oldList != null)
		{
			oldList.removeListListener(this);
		}
		this.delegate = list;
		if (list != null)
		{
			list.addListListener(this);
		}
		refilter();
	}

	public void refilter()
	{
		data.clear();
		if (delegate != null)
		{
			List<E> list = new ArrayList<>(delegate.getSize());
			for (E element : delegate)
			{
				if (filter == null || filter.accept(context, element))
				{
					list.add(element);
				}
			}
			data.addAll(list);
		}
		fireElementsChanged(this);
	}

	@Override
	public void elementAdded(ListEvent<E> e)
	{
		if (filter == null || filter.accept(context, e.getElement()))
		{
			int size = data.size();
			data.add(e.getElement());
			fireElementAdded(this, e.getElement(), size);
		}
	}

	@Override
	public void elementRemoved(ListEvent<E> e)
	{
		int index = data.indexOf(e.getElement());
		data.remove(e.getElement());
		fireElementRemoved(this, e.getElement(), index);
	}

	@Override
	public void elementsChanged(ListEvent<E> e)
	{
		refilter();
	}

	@Override
	public void elementModified(ListEvent<E> e)
	{
		if (data.contains(e.getElement()))
		{
			if (filter != null && !filter.accept(context, e.getElement()))
			{
				elementRemoved(e);
			}
		}
		else
		{
			elementAdded(e);
		}

	}

}