/*

 * Copyright (C) 2020, University of the Basque Country (UPV/EHU)

 *  Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
 *
 * The original file was part of Open Source IMSDROID
 *  Copyright (C) 2010-2011, Mamadou Diop.
 *  Copyright (C) 2011, Doubango Telecom.
 *
 *
 * Contact: Mamadou Diop <diopmamadou(at)doubango(dot)org>
 *
 * This file is part of Open Source Doubango Framework.
 *
 * This 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 3
 * of the License, or (at your option) any later version.
 *
 * This 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.
 */
 package org.doubango.ngn.utils;
 
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Observable;
 import java.util.Observer;
 import java.util.Set;
 
 public class NgnObservableHashMap<K, V>  extends NgnObservableObject implements Observer{
 	private final HashMap<K, V> mHashMap;
 	private final boolean mWatchValueChanged;
 	
 	public NgnObservableHashMap(boolean watchValueChanged){
 		super();
 		mHashMap = new HashMap<K, V>();
 		if((mWatchValueChanged = watchValueChanged)){
 			
 		}
 	}
 	
 	public V put(K key, V value){
 		if(value == null){
 			return null;
 		}
 		V result = mHashMap.put(key, value);
 		if(mWatchValueChanged && value instanceof Observable){
 			((Observable)value).addObserver(this);
 		}
 		super.setChangedAndNotifyObservers(result);
 		return result;
 	}
 	
 	public V get(K key){
 		return mHashMap.get(key);
 	}
 	
 	public V getAt(int position){
 		int index = 0;
 		for(Map.Entry<K, V> entry : mHashMap.entrySet()) {
 			if(index == position){
 				return entry.getValue();
 			}
 		    index++;
 		}
 		return null;
 	}
 	
 	public Collection<V> values(){
 		return this.mHashMap.values();
 	}
 	
 	public V remove(K key){
 		V result = this.mHashMap.remove(key);
 		if(this.mWatchValueChanged && result != null && result instanceof Observable){
 			((Observable)result).deleteObserver(this);
 		}
 		super.setChangedAndNotifyObservers(result);
 		return result;
 	}
 	
 	public boolean isEmpty(){
 		return this.mHashMap.isEmpty();
 	}
 	
 	public boolean containsKey(K key){
 		return this.mHashMap.containsKey(key);
 	}
 	
 	public Set<Entry<K, V>> entrySet(){
 		return this.mHashMap.entrySet();
 	}
 	
 	public int size(){
 		return this.mHashMap.size();
 	}
 	
 	@Override
 	public void update(Observable observable, Object data) {
 		super.setChangedAndNotifyObservers(data);
 	}
 }