package frame.object.data;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class DataObjectContainer {

	private static DataObjectContainer instance;
	private static Map<String, DataObject> dataObjectMap;
	private Object locker;
	
	
	private DataObjectContainer() {
		dataObjectMap = new ConcurrentHashMap<String, DataObject>();
		locker = new Object();
	}
	
	public synchronized static DataObjectContainer getInstance() {
		if (instance == null) {
			instance = new DataObjectContainer();
		}
		
		return instance;
	}
	
	public DataObject get(String tableName) throws Exception {
		if (tableName == null) {
			return null;
		}
		
		tableName = tableName.toLowerCase();
		DataObject result = dataObjectMap.get(tableName);
		
		if (result == null) {
			synchronized (locker) {
				if (result == null) {
					result = new DataObject(tableName);
					result.getEntityMeta();
				}
			}
		}
		
		return result;
	}

}