2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights
7 * ================================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 * ============LICENSE_END=========================================================
22 package org.openecomp.appc.statemachine.impl;
24 import java.util.HashSet;
27 import org.openecomp.appc.statemachine.StateMachine;
28 import org.openecomp.appc.statemachine.objects.*;
31 public class StateMachineImpl implements StateMachine {
33 private final Set<State> states;
35 private final Set<Event> events;
37 StateMachineImpl(StateMachineMetadata metadata){
38 this.states = new HashSet<State>();
39 this.states.addAll(metadata.getStates());
40 this.events = new HashSet<Event>();
41 this.events.addAll(metadata.getEvents());
44 public StateMachineResponse handleEvent(State inputState, Event event) throws InvalidInputException{
46 if(!validateInputs(inputState,event)){
47 throw new InvalidInputException("VNF State or incoming event is invalid. State = " +inputState + " event = " + event );
50 StateMachineResponse response = new StateMachineResponse();
51 State currentState = null,nextState = null;
52 for(State stateInSet:states){
53 if(stateInSet.equals(inputState)){
54 currentState = stateInSet;
58 for(Transition transition : currentState.getTransitions()){
59 if(event.equals(transition.getEvent())){
60 nextState = transition.getNextState();
63 if(nextState == null){
64 response.setResponse(Response.NO_TRANSITION_DEFINED);
66 else if(inputState.equals(nextState)){
67 response.setResponse(Response.NO_STATE_CHANGE);
70 response.setResponse(Response.VALID_TRANSITION);
72 response.setNextState(nextState);
76 private boolean validateInputs(State state,Event event){
77 if(state ==null || event == null){
80 if(!(this.states.contains(state) && this.events.contains(event))){
87 public String toString() {
88 return "StateMachineImpl{" +
90 ", events=" + events +