l2j-server-game/L2J_Server_BETA/java/com/l2jserver/gameserver/util/L2SyncMap.java

/*
 * This program 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 program 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, see <http://www.gnu.org/licenses/>.
 */
package com.l2jserver.gameserver.util;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

import com.l2jserver.util.L2FastMap;
import com.l2jserver.util.L2FastMap.I2ForEach;
import com.l2jserver.util.L2FastMap.I2ForEachKey;
import com.l2jserver.util.L2FastMap.I2ForEachValue;

/**
 * Fully synchronized version of L2FastMap class.<br>
 * In addition it`s provide ForEach methods and interfaces that can be used for iterating collection without using iterators.<br>
 * As addition its provide full lock on entire class if needed<br>
 * <font color="red">WARNING!!! methods: keySet(), values() and entrySet() are removed!</font> <br>
 * @author Julian Version: 1.0.0 <2008-02-07> - Original release
 * @author Julian Varsion: 1.0.1 <2008-06-17> - Changed underlying map to L2FastMap
 * @param <K>
 * @param <V>
 */
public class L2SyncMap<K extends Object, V extends Object> implements Map<K, V>
{
	private final L2FastMap<K, V> _map = new L2FastMap<>();
	
	@Override
	public synchronized V put(K key, V value)
	{
		return _map.put(key, value);
	}
	
	@Override
	public synchronized V get(Object key)
	{
		return _map.get(key);
	}
	
	@Override
	public synchronized V remove(Object key)
	{
		return _map.remove(key);
	}
	
	@Override
	public synchronized boolean containsKey(Object key)
	{
		return _map.containsKey(key);
	}
	
	@Override
	public synchronized int size()
	{
		return _map.size();
	}
	
	@Override
	public synchronized boolean isEmpty()
	{
		return _map.isEmpty();
	}
	
	@Override
	public synchronized void clear()
	{
		_map.clear();
	}
	
	/**
	 * This method use specific locking strategy: map which have lowest hashCode() will be locked first
	 * @see java.util.Map#putAll(java.util.Map)
	 */
	@Override
	public void putAll(Map<? extends K, ? extends V> map)
	{
		if ((map == null) || (this == map))
		{
			return;
		}
		if (this.hashCode() <= map.hashCode())
		{
			synchronized (this)
			{
				synchronized (map)
				{
					_map.putAll(map);
				}
			}
		}
		else
		{
			synchronized (map)
			{
				synchronized (this)
				{
					_map.putAll(map);
				}
			}
		}
	}
	
	@Override
	public synchronized boolean containsValue(Object value)
	{
		return _map.containsValue(value);
	}
	
	@Override
	public synchronized boolean equals(Object o)
	{
		return _map.equals(o);
	}
	
	@Override
	public synchronized int hashCode()
	{
		return _map.hashCode();
	}
	
	@Override
	public synchronized String toString()
	{
		return _map.toString();
	}
	
	/**
	 * Public method that iterate entire collection.<br>
	 * <br>
	 * @param func - a class method that must be executed on every element of collection.<br>
	 * @return - returns true if entire collection is iterated, false if it`s been interrupted by check method (I2ForEach.forEach())<br>
	 */
	public synchronized final boolean ForEach(I2ForEach<K, V> func)
	{
		return _map.ForEach(func);
	}
	
	public synchronized final boolean ForEachValue(I2ForEachValue<V> func)
	{
		return _map.ForEachValue(func);
	}
	
	public synchronized final boolean ForEachKey(I2ForEachKey<K> func)
	{
		return _map.ForEachKey(func);
	}
	
	/**
	 * <font color="red">Unsupported operation!!!</font>
	 * @deprecated
	 * @throws UnsupportedOperationException
	 * @see java.util.Map#values()
	 */
	@Override
	@Deprecated
	public Collection<V> values()
	{
		throw new UnsupportedOperationException();
	}
	
	/**
	 * <font color="red">Unsupported operation!!!</font>
	 * @return
	 * @deprecated
	 * @throws UnsupportedOperationException
	 */
	@Override
	@Deprecated
	public Set<K> keySet()
	{
		throw new UnsupportedOperationException();
	}
	
	/**
	 * <font color="red">Unsupported operation!!!</font>
	 * @deprecated
	 * @throws UnsupportedOperationException
	 * @see java.util.Map#entrySet()
	 */
	@Override
	@Deprecated
	public Set<Map.Entry<K, V>> entrySet()
	{
		throw new UnsupportedOperationException();
	}
}