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/*-
* ============LICENSE_START=======================================================
* openECOMP : APP-C
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.appc.statemachine.impl;
import java.util.HashSet;
import java.util.Set;
import org.openecomp.appc.statemachine.StateMachine;
import org.openecomp.appc.statemachine.objects.*;
public class StateMachineImpl implements StateMachine {
private final Set<State> states;
private final Set<Event> events;
StateMachineImpl(StateMachineMetadata metadata){
this.states = new HashSet<State>();
this.states.addAll(metadata.getStates());
this.events = new HashSet<Event>();
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;
}
}
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){
if(state ==null || event == null){
return false;
}
if(!(this.states.contains(state) && this.events.contains(event))){
return false;
}
return true;
}
@Override
public String toString() {
return "StateMachineImpl{" +
"states=" + states +
", events=" + events +
'}';
}
}
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