gamecontext.java

本代码为java编写的泡泡龙游戏

import java.util.Vector;
import java.util.Hashtable;
/**
 * A convenient way to maintain all objects required by the game, 
 * it allows data exchange between GameScreens
 */

public class GameContext
{
	private Vector dataList;
	private Vector keyList;
	
	public GameContext()
	{
		dataList = new Vector();
		keyList = new Vector();
	}
	
	public final void addObject(String key, Object object)
	{
		int index = findObject(key);
		
		if (index == -1)
		{
			keyList.addElement(key);
			dataList.addElement(object);
		}
		else
		{
			dataList.setElementAt(object, index);
		}
	}
	
	public final void removeObject(String key)
	{
		int index = findObject(key);
		
		if (index != -1)
		{
			keyList.removeElementAt(index);
			dataList.removeElementAt(index);
		}
	}
	
	public final Object getObject(String key)
	{
		int index = findObject(key);
		
		if (index != -1)
		{
			return dataList.elementAt(index);
		}
		
		return null;
	}
	
	private int findObject(String key)
	{
		for (int i=0 ; i<keyList.size() ; i++)
		{
			if (((String)keyList.elementAt(i)).equals(key))
			{
				return i;
			}
		}
		
		return -1;
	}
}