/*
 * 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
 */
/*
 * GameObjectStreamData.java
 * 
 * Created on January 3, 2002, 2:48 PM
 */
package games.strategy.engine.data;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

/**
 * 
 * @author Sean Bridges
 */
public class GameObjectStreamData implements Externalizable
{
	private static final long serialVersionUID = 740501183336843321L;
	
	
	enum GameType
	{
		PLAYERID, UNITTYPE, TERRITORY, PRODUCTIONRULE, PRODUCTIONFRONTIER
	}
	
	public static boolean canSerialize(final Named obj)
	{
		return obj instanceof PlayerID || obj instanceof UnitType || obj instanceof Territory || obj instanceof ProductionRule || obj instanceof IAttachment || obj instanceof ProductionFrontier;
	}
	
	private String m_name;
	private GameType m_type;
	
	public GameObjectStreamData()
	{
	}
	
	/**
	 * Creates a new instance of GameObjectStreamData
	 * 
	 * @param named
	 *            named entity
	 */
	public GameObjectStreamData(final Named named)
	{
		m_name = named.getName();
		if (named instanceof PlayerID)
		{
			m_type = GameType.PLAYERID;
		}
		else if (named instanceof Territory)
		{
			m_type = GameType.TERRITORY;
		}
		else if (named instanceof UnitType)
		{
			m_type = GameType.UNITTYPE;
		}
		else if (named instanceof ProductionRule)
		{
			m_type = GameType.PRODUCTIONRULE;
		}
		else if (named instanceof ProductionFrontier)
		{
			m_type = GameType.PRODUCTIONFRONTIER;
		}
		else
			throw new IllegalArgumentException("Wrong type:" + named);
	}
	
	public Named getReference(final GameData data)
	{
		if (data == null)
			throw new IllegalArgumentException("Data cant be null");
		data.acquireReadLock();
		try
		{
			switch (m_type)
			{
				case PLAYERID:
					return data.getPlayerList().getPlayerID(m_name);
				case TERRITORY:
					return data.getMap().getTerritory(m_name);
				case UNITTYPE:
					return data.getUnitTypeList().getUnitType(m_name);
				case PRODUCTIONRULE:
					return data.getProductionRuleList().getProductionRule(m_name);
				case PRODUCTIONFRONTIER:
					return data.getProductionFrontierList().getProductionFrontier(m_name);
			}
			throw new IllegalStateException("Unknown type" + this);
		} finally
		{
			data.releaseReadLock();
		}
	}
	
	public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException
	{
		m_name = (String) in.readObject();
		m_type = GameType.values()[in.readByte()];
	}
	
	public void writeExternal(final ObjectOutput out) throws IOException
	{
		out.writeObject(m_name);
		out.writeByte((byte) m_type.ordinal());
	}
}
