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/*
* ============LICENSE_START=======================================================
* Copyright (c) 2021 Bell Canada.
* ================================================================================
* 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.temporal.repository;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.onap.cps.temporal.domain.NetworkData;
import org.onap.cps.temporal.domain.SearchCriteria;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Slice;
import org.springframework.data.domain.SliceImpl;
import org.springframework.stereotype.Repository;
@Repository
@Slf4j
public class NetworkDataRepositoryImpl implements NetworkDataQueryRepository {
@PersistenceContext
private EntityManager entityManager;
/*
Slice is the response type instead of List<NetworkData> to provide the information if next set of data is available.
To identify if next slice is available, the getDatNetworkDataList fetches one record extra ( n+1).
If ( n +1) records are fetched, it means that the next slice exist, otherwise it does not.
*/
@Override
public Slice<NetworkData> findBySearchCriteria(final SearchCriteria searchCriteria) {
final var searchCriteriaQueryBuilder = new SearchCriteriaQueryBuilder(searchCriteria);
searchCriteriaQueryBuilder.buildQuery();
final List<NetworkData> data = getNetworkDataList(searchCriteriaQueryBuilder.getDataNativeQuery(),
searchCriteriaQueryBuilder.getQueryParameters(), searchCriteria.getPageable());
final boolean hasNextSlice = data.size() > searchCriteria.getPageable().getPageSize();
final List<NetworkData> sliceData = new ArrayList<>(data);
if (hasNextSlice) {
sliceData.remove(searchCriteria.getPageable().getPageSize());
}
return new SliceImpl<>(sliceData, searchCriteria.getPageable(), hasNextSlice);
}
private List<NetworkData> getNetworkDataList(final String nativeDataQuery,
final Map<String, Object> queryParameters, final Pageable pageable) {
final var dataQuery = entityManager.createNativeQuery(nativeDataQuery, NetworkData.class);
queryParameters.forEach(dataQuery::setParameter);
dataQuery.setFirstResult(Math.toIntExact(pageable.getOffset()));
dataQuery.setMaxResults(pageable.getPageSize() + 1);
return dataQuery.getResultList();
}
private static class SearchCriteriaQueryBuilder {
@Getter
private Map<String, Object> queryParameters = new HashMap<>();
private StringBuilder queryBuilder = new StringBuilder();
private String dataQuery;
private final SearchCriteria searchCriteria;
SearchCriteriaQueryBuilder(final SearchCriteria searchCriteria) {
this.searchCriteria = searchCriteria;
}
private void buildQuery() {
queryBuilder.append("SELECT * FROM network_data nd WHERE dataspace = :dataspace ");
queryParameters.put("dataspace", searchCriteria.getDataspaceName());
addAnchorCondition();
addSchemaSetCondition();
addObservedAfterCondition();
addSimplePayloadCondition();
addCreatedBeforeCondition();
addOrderBy();
dataQuery = queryBuilder.toString();
}
private void addSchemaSetCondition() {
if (!StringUtils.isEmpty(searchCriteria.getSchemaSetName())) {
queryBuilder.append(" AND schema_set = :schemaSetName ");
queryParameters.put("schemaSetName", searchCriteria.getSchemaSetName());
}
}
private void addAnchorCondition() {
if (!StringUtils.isEmpty(searchCriteria.getAnchorName())) {
queryBuilder.append(" AND anchor = :anchorName");
queryParameters.put("anchorName", searchCriteria.getAnchorName());
}
}
private void addSimplePayloadCondition() {
if (!StringUtils.isEmpty(searchCriteria.getSimplePayloadFilter())) {
queryBuilder.append(" AND payload @> :simplePayloadFilter\\:\\:jsonb ");
queryParameters.put("simplePayloadFilter", searchCriteria.getSimplePayloadFilter());
}
}
private void addCreatedBeforeCondition() {
if (searchCriteria.getCreatedBefore() != null) {
queryBuilder.append(" AND created_timestamp <= :createdBefore");
queryParameters.put("createdBefore", searchCriteria.getCreatedBefore());
}
}
private void addObservedAfterCondition() {
if (searchCriteria.getObservedAfter() != null) {
queryBuilder.append(" AND observed_timestamp >= :observedAfter");
queryParameters.put("observedAfter", searchCriteria.getObservedAfter());
}
}
private void addOrderBy() {
final var sortBy = searchCriteria.getPageable().getSort();
queryBuilder.append(" ORDER BY ");
final String orderByQuery = sortBy.stream().map(order -> {
final var direction = order.isAscending() ? "asc" : "desc";
return order.getProperty() + " " + direction;
}).collect(Collectors.joining(","));
queryBuilder.append(orderByQuery);
}
String getDataNativeQuery() {
return dataQuery;
}
}
}
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