diff options
Diffstat (limited to 'appc-lifecycle-management/state-machine-lib/src/main/java/org/onap/appc/statemachine/impl/StateMachineImpl.java')
-rw-r--r-- | appc-lifecycle-management/state-machine-lib/src/main/java/org/onap/appc/statemachine/impl/StateMachineImpl.java | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/appc-lifecycle-management/state-machine-lib/src/main/java/org/onap/appc/statemachine/impl/StateMachineImpl.java b/appc-lifecycle-management/state-machine-lib/src/main/java/org/onap/appc/statemachine/impl/StateMachineImpl.java new file mode 100644 index 000000000..b56250708 --- /dev/null +++ b/appc-lifecycle-management/state-machine-lib/src/main/java/org/onap/appc/statemachine/impl/StateMachineImpl.java @@ -0,0 +1,103 @@ +/*- + * ============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.onap.appc.statemachine.impl; + +import java.util.HashSet; +import java.util.Set; + +import org.onap.appc.exceptions.InvalidInputException; +import org.onap.appc.statemachine.StateMachine; +import org.onap.appc.statemachine.objects.Event; +import org.onap.appc.statemachine.objects.Response; +import org.onap.appc.statemachine.objects.State; +import org.onap.appc.statemachine.objects.StateMachineMetadata; +import org.onap.appc.statemachine.objects.StateMachineResponse; +import org.onap.appc.statemachine.objects.Transition; + +/** + * Implementation of StateMachine + */ +public class StateMachineImpl implements StateMachine { + private static final String invalidInputFormat = "VNF State or incoming event is invalid. State = %s event = %s"; + static final String toStringFormat = "StateMachineImpl{states=%s, events=%s}"; + + private final Set<State> states; + private final Set<Event> events; + + StateMachineImpl(StateMachineMetadata metadata){ + this.states = new HashSet<>(); + this.states.addAll(metadata.getStates()); + this.events = new HashSet<>(); + this.events.addAll(metadata.getEvents()); + } + + @Override + public StateMachineResponse handleEvent(State inputState, Event event) throws InvalidInputException{ + + if(!validateInputs(inputState,event)){ + throw new InvalidInputException(String.format(invalidInputFormat, inputState, event)); + } + + StateMachineResponse response = new StateMachineResponse(); + State currentState = null; + State 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; + } + + boolean validateInputs(State state,Event event) { + return state != null + && event != null + && this.states.contains(state) + && this.events.contains(event); + } + + @Override + public String toString() { + return String.format(toStringFormat, states, events); + } +} |