package foundation.data.object;

import foundation.data.loader.DataObjectLoader;
import foundation.server.Container;
import foundation.util.Util;

public class DataObjectContainer extends Container<DataObject> {

	private static DataObjectContainer instance;
	
	
	private DataObjectContainer() {
		
	}
	
	public synchronized static DataObjectContainer getInstance() {
		if (instance == null) {
			instance = new DataObjectContainer();
		}
		
		return instance;
	}

	public DataObject get(String name, boolean force) {
		if (name == null) {
			return null;
		}
		
		DataObject result = super.get(name);
		
		if (result != null || !force) {
			return result;
		}
		
		return createOne(name);
	}
	
	@Override
	public DataObject get(String name) {
		if (name == null) {
			return null;
		}
		
		DataObject result = super.get(name);
		
		if (result != null) {
			return result;
		}
		
		return createOne(name);
	}
	
	public DataObject refresh(String dataName) throws Exception {
		if (name == null) {
			return null;
		}
		
		DataObject result = DataObjectLoader.loadOneDataObject(dataName);
				
		if (result == null) {
			result = createOne(dataName);
		}
		
		synchronized (this) {
			add(dataName, result);
		}

		return result;
	}
	
    public synchronized DataObject createOne(String name) {
        if (Util.isEmpty(name)) {
            return null;
        } 
        
        synchronized (this) {
        	DataObject result = null;
        	
			try {
				result = super.get(name);
				
				if (result == null) {
					result = DataObjectCreator.createDataObject(name);
					this.add(name, result);
				}				
			}
			catch (Exception e) {
			}
			
			return result;
        }
    }

}