code: public ManagementGate getOutputGate(final int index) {
  
  		if (index < this.outputGates.size()) {
  			return this.outputGates.get(index);
  		}
  
  		return null;
  	}
docs: Returns the output gate at the given index.
  
  @param index
  the index of the output gate to be returned
  @return the output gate at the given index or <code>null</code> if no such output gate exists