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/*-
* ============LICENSE_START=======================================================
* ONAP CLAMP
* ================================================================================
* Copyright (C) 2019 Nokia 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.onap.clamp.clds.sdc.controller.installer;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.springframework.stereotype.Component;
@Component
public class ChainGenerator {
ChainGenerator() {
}
/**
* Get list of microservices chain.
*
* @param input A set of microservices
* @return The list of microservice chained
*/
public List<BlueprintMicroService> getChainOfMicroServices(Set<BlueprintMicroService> input) {
LinkedList<BlueprintMicroService> returnList = new LinkedList<>();
if (preValidate(input)) {
LinkedList<BlueprintMicroService> theList = new LinkedList<>();
for (BlueprintMicroService ms : input) {
insertNodeTemplateIntoChain(ms, theList);
}
if (postValidate(theList)) {
returnList = theList;
}
}
return returnList;
}
private boolean preValidate(Set<BlueprintMicroService> input) {
List<BlueprintMicroService> noInputs = input.stream().filter(ms -> "".equals(ms.getInputFrom()))
.collect(Collectors.toList());
return noInputs.size() == 1;
}
private boolean postValidate(LinkedList<BlueprintMicroService> microServices) {
for (int i = 1; i < microServices.size() - 1; i++) {
BlueprintMicroService prev = microServices.get(i - 1);
BlueprintMicroService current = microServices.get(i);
if (!current.getInputFrom().equals(prev.getName())) {
return false;
}
}
return true;
}
private void insertNodeTemplateIntoChain(BlueprintMicroService microServicetoInsert,
LinkedList<BlueprintMicroService> chainOfMicroServices) {
int insertIndex = 0;
for (int i = 0; i < chainOfMicroServices.size(); i++) {
BlueprintMicroService current = chainOfMicroServices.get(i);
if (microServicetoInsert.getName().equals(current.getInputFrom())) {
insertIndex = i;
break;
} else if (current.getName().equals(microServicetoInsert.getInputFrom())) {
insertIndex = i + 1;
break;
}
}
chainOfMicroServices.add(insertIndex, microServicetoInsert);
}
}
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