public boolean isAccessible(Byte source) {
		if (this.oneToOne.containsKey(source) == false)
			return false;
		
		if (this.oneToOne.get(source).getValue() == (byte)0)
			return false;
					
		if (this.oneToOne.get(source).getKey() == (byte) 0)
			return false;
		
		return true;
		
	}