/*- * ============LICENSE_START======================================================= * ONAP : APPC * ================================================================================ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. * ================================================================================ * Copyright (C) 2017 Amdocs * ============================================================================= * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * ECOMP is a trademark and service mark of AT&T Intellectual Property. * ============LICENSE_END========================================================= */ package org.openecomp.appc.statemachine.impl; import java.util.HashSet; import java.util.Set; import org.openecomp.appc.exceptions.InvalidInputException; import org.openecomp.appc.statemachine.StateMachine; import org.openecomp.appc.statemachine.objects.Event; import org.openecomp.appc.statemachine.objects.Response; import org.openecomp.appc.statemachine.objects.State; import org.openecomp.appc.statemachine.objects.StateMachineMetadata; import org.openecomp.appc.statemachine.objects.StateMachineResponse; import org.openecomp.appc.statemachine.objects.Transition; public class StateMachineImpl implements StateMachine { private final Set states; private final Set events; StateMachineImpl(StateMachineMetadata metadata){ this.states = new HashSet<>(); this.states.addAll(metadata.getStates()); this.events = new HashSet<>(); this.events.addAll(metadata.getEvents()); } public StateMachineResponse handleEvent(State inputState, Event event) throws InvalidInputException{ if(!validateInputs(inputState,event)){ throw new InvalidInputException("VNF State or incoming event is invalid. State = " +inputState + " event = " + event ); } StateMachineResponse response = new StateMachineResponse(); State currentState = null,nextState = null; for(State stateInSet:states){ if(stateInSet.equals(inputState)){ currentState = stateInSet; break; } } if (currentState != null) { for (Transition transition : currentState.getTransitions()) { if (event.equals(transition.getEvent())) { nextState = transition.getNextState(); } } } if(nextState == null){ response.setResponse(Response.NO_TRANSITION_DEFINED); } else if(inputState.equals(nextState)){ response.setResponse(Response.NO_STATE_CHANGE); } else{ response.setResponse(Response.VALID_TRANSITION); } response.setNextState(nextState); return response; } private boolean validateInputs(State state,Event event) { return state != null && event != null && this.states.contains(state) && this.events.contains(event); } @Override public String toString() { return "StateMachineImpl{" + "states=" + states + ", events=" + events + '}'; } }