package de.fhdw.wtf.context.model.collections;
   
   import java.util.concurrent.ConcurrentHashMap;
   
   import de.fhdw.wtf.context.model.Anything;
   
   /**
    * A class to represent Key-Value-Pairs of WTF-specific classes or interfaces.
    * 
   * @param <K>
   *            K is a subtype of Anything and represents the Type of keys.
   * @param <V>
   *            V is a subtype of Anything and represents the Type of values.
   */
  public class TransientMap<K extends Anything, V extends Anything> extends MutableMap<K, V> {
  	
  	/**
  	 * The underlying map.
  	 */
  	private final ConcurrentHashMap<K, V> internalMap;
  	
  	/**
  	 * Creates a TransientMap.
  	 */
  	public TransientMap() {
  		this.internalMap = new ConcurrentHashMap<>();
  	}
  	
  	@Override
  	public void put(final K key, final V value) {
  		if (key == null || value == null) {
  			throw new NullPointerException();
  		}
  		this.internalMap.put(key, value);
  	}
  	
  	@Override
  	public V get(final K key) {
  		if (key == null) {
  			throw new NullPointerException();
  		}
  		return this.internalMap.get(key);
  	}
  	
  	@Override
  	public V remove(final K key) {
  		if (key == null) {
  			throw new NullPointerException();
  		}
  		return this.internalMap.remove(key);
  	}
  	
  	// @Override
  	// public void clear() {
  	// internalMap = new ConcurrentHashMap<K,V>();
  	// }
  }