2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.appc.seqgen.impl;
23 import org.onap.appc.domainmodel.lcm.VNFOperation;
24 import org.onap.appc.exceptions.APPCException;
25 import org.onap.appc.seqgen.SequenceGenerator;
27 public class SequenceGeneratorFactory {
29 private static class ReferenceHolder {
30 private static SequenceGeneratorFactory instance = new SequenceGeneratorFactory();
31 private ReferenceHolder(){
36 private SequenceGeneratorFactory(){
40 public static SequenceGeneratorFactory getInstance(){
41 return ReferenceHolder.instance;
44 public SequenceGenerator createSequenceGenerator(VNFOperation operation) throws APPCException {
47 return new StartSequenceGenerator();
49 return new StopSequenceGenerator();
51 throw new APPCException("Sequence Generator does not support operation " + operation.name());