public abstract class AbstractTable implements Function {
	//Abstract methods
	public abstract Object get(Object key);
	public abstract Object put(Object key,Object value);
	public abstract Object remove(Object key);
	public abstract java.util.Iterator keys();
	public abstract java.util.Iterator values();
	
	
	//Function methods implementation
	public boolean containsKey(Object key) {
		return keySet().contains(key);
	}
	
	public boolean containsValue(Object value) {
		throw new UnsupportedOperationException();
	}
	
	public boolean isEmpty() { return entrySet().isEmpty(); }
	
	public boolean equals(Object obj) {
		throw new UnsupportedOperationException();
	}	
	
	public int size() { return entrySet().size(); }
	 	
  	public java.util.Set keySet() {
  		java.util.Set result = new java.util.HashSet();
  		java.util.Iterator it = keys();
  		while(it.hasNext())
  			result.add(it.next());
  		return result;
	}
	
	public java.util.Collection entryValues() {
		throw new UnsupportedOperationException();
	}
	
	public java.util.Set entrySet() {
		java.util.Set result = new java.util.HashSet();
  		java.util.Iterator it = keys();
  		while(it.hasNext()) {
  			Object key = it.next();
  			Entry m = new Entry(key);
  			m.setValue(get(key));
  			result.add(m);
  		}
  		return result;
	}
	
	//Override
	public String toString() {
		String result = "";
		java.util.Iterator it = keys();
  		while(it.hasNext()) {
  			Object key = it.next();
  			Entry m = new Entry(key);
  			m.setValue(get(key));
  			result = result + m + "\n";
  		}
  		return result;	
	}
}