ListenerHelper.java

/*****************************************************************************
 *  Limpet - the Lightweight InforMation ProcEssing Toolkit
 *  http://limpet.info
 *
 *  (C) 2015-2016, Deep Blue C Technologies Ltd
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the Eclipse Public License v1.0
 *  (http://www.eclipse.org/legal/epl-v10.html)
 *
 *  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.
 *****************************************************************************/
package info.limpet.data.impl;

import info.limpet.IChangeListener;
import info.limpet.IStoreItem;

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

public class ListenerHelper
{

	private List<IChangeListener> _listeners;

	public ListenerHelper()
	{
		_listeners = new ArrayList<IChangeListener>();
	}

	public void add(IChangeListener listener)
	{
		_listeners.add(listener);
	}

	public void fireDataChange(IStoreItem subject)
	{
		Iterator<IChangeListener> iter = _listeners.iterator();
		while (iter.hasNext())
		{
			IChangeListener iL = (IChangeListener) iter.next();
			iL.dataChanged(subject);
		}
	}
	
	public void fireMetadataChange(IStoreItem subject)
	{
		Iterator<IChangeListener> iter = _listeners.iterator();
		while (iter.hasNext())
		{
			IChangeListener iL = (IChangeListener) iter.next();
			iL.metadataChanged(subject);
		}
	}
	
	public void beingDeleted(IStoreItem subject)
	{
		Iterator<IChangeListener> iter = _listeners.iterator();
		while (iter.hasNext())
		{
			IChangeListener iL = (IChangeListener) iter.next();
			iL.collectionDeleted(subject);
		}
	}

	public void remove(IChangeListener listener)
	{
		_listeners.remove(listener);
	}

	
}