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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 TechMahindra Ltd.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.api.impl;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.onap.cps.api.CpsDeltaService;
import org.onap.cps.spi.model.DataNode;
import org.onap.cps.spi.model.DeltaReport;
import org.onap.cps.spi.model.DeltaReportBuilder;
import org.springframework.stereotype.Service;
@Slf4j
@Service
@NoArgsConstructor
public class CpsDeltaServiceImpl implements CpsDeltaService {
@Override
public List<DeltaReport> getDeltaReports(final Collection<DataNode> sourceDataNodes,
final Collection<DataNode> targetDataNodes) {
final List<DeltaReport> deltaReport = new ArrayList<>();
final Map<String, DataNode> xpathToSourceDataNodes = convertToXPathToDataNodesMap(sourceDataNodes);
final Map<String, DataNode> xpathToTargetDataNodes = convertToXPathToDataNodesMap(targetDataNodes);
deltaReport.addAll(getRemovedDeltaReports(xpathToSourceDataNodes, xpathToTargetDataNodes));
deltaReport.addAll(getAddedDeltaReports(xpathToSourceDataNodes, xpathToTargetDataNodes));
return Collections.unmodifiableList(deltaReport);
}
private static Map<String, DataNode> convertToXPathToDataNodesMap(
final Collection<DataNode> dataNodes) {
final Map<String, DataNode> xpathToDataNode = new LinkedHashMap<>();
for (final DataNode dataNode : dataNodes) {
xpathToDataNode.put(dataNode.getXpath(), dataNode);
final Collection<DataNode> childDataNodes = dataNode.getChildDataNodes();
if (!childDataNodes.isEmpty()) {
xpathToDataNode.putAll(convertToXPathToDataNodesMap(childDataNodes));
}
}
return xpathToDataNode;
}
private static List<DeltaReport> getRemovedDeltaReports(
final Map<String, DataNode> xpathToSourceDataNodes,
final Map<String, DataNode> xpathToTargetDataNodes) {
final List<DeltaReport> removedDeltaReportEntries = new ArrayList<>();
for (final Map.Entry<String, DataNode> entry: xpathToSourceDataNodes.entrySet()) {
final String xpath = entry.getKey();
final DataNode sourceDataNode = entry.getValue();
final DataNode targetDataNode = xpathToTargetDataNodes.get(xpath);
if (targetDataNode == null) {
final Map<String, Serializable> sourceDataNodeLeaves = sourceDataNode.getLeaves();
final DeltaReport removedData = new DeltaReportBuilder().actionRemove().withXpath(xpath)
.withSourceData(sourceDataNodeLeaves).build();
removedDeltaReportEntries.add(removedData);
}
}
return removedDeltaReportEntries;
}
private static List<DeltaReport> getAddedDeltaReports(final Map<String, DataNode> xpathToSourceDataNodes,
final Map<String, DataNode> xpathToTargetDataNodes) {
final List<DeltaReport> addedDeltaReportEntries = new ArrayList<>();
final Map<String, DataNode> xpathToAddedNodes = new LinkedHashMap<>(xpathToTargetDataNodes);
xpathToAddedNodes.keySet().removeAll(xpathToSourceDataNodes.keySet());
for (final Map.Entry<String, DataNode> entry: xpathToAddedNodes.entrySet()) {
final String xpath = entry.getKey();
final DataNode dataNode = entry.getValue();
final DeltaReport addedDataForDeltaReport = new DeltaReportBuilder().actionAdd().withXpath(xpath)
.withTargetData(dataNode.getLeaves()).build();
addedDeltaReportEntries.add(addedDataForDeltaReport);
}
return addedDeltaReportEntries;
}
}
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