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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 Nordix Foundation.
* ================================================================================
* 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.spi.repository;
import java.sql.Connection;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import lombok.RequiredArgsConstructor;
import org.onap.cps.spi.FetchDescendantsOption;
import org.onap.cps.spi.entities.AnchorEntity;
import org.onap.cps.spi.entities.FragmentEntity;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementSetter;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;
@Repository
@RequiredArgsConstructor
public class FragmentPrefetchRepositoryImpl implements FragmentPrefetchRepository {
private final JdbcTemplate jdbcTemplate;
@Override
public Collection<FragmentEntity> prefetchDescendantsOfFragmentEntities(
final FetchDescendantsOption fetchDescendantsOption,
final Collection<FragmentEntity> proxiedFragmentEntities) {
if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
return proxiedFragmentEntities;
}
final List<Long> fragmentEntityIds = proxiedFragmentEntities.stream()
.map(FragmentEntity::getId).collect(Collectors.toList());
final Map<Long, AnchorEntity> anchorEntityPerId = proxiedFragmentEntities.stream()
.map(FragmentEntity::getAnchor)
.collect(Collectors.toMap(AnchorEntity::getId, anchor -> anchor, (anchor1, anchor2) -> anchor1));
final int maxDepth = fetchDescendantsOption.equals(FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
? Integer.MAX_VALUE
: fetchDescendantsOption.getDepth();
return findFragmentEntitiesWithDescendantsByIds(fragmentEntityIds, anchorEntityPerId, maxDepth);
}
private Collection<FragmentEntity> findFragmentEntitiesWithDescendantsByIds(
final Collection<Long> fragmentEntityIds,
final Map<Long, AnchorEntity> anchorEntityPerId,
final int maxDepth) {
final String sql
= "WITH RECURSIVE parent_search AS ("
+ " SELECT id, 0 AS depth "
+ " FROM fragment "
+ " WHERE id = ANY (?) "
+ " UNION "
+ " SELECT child.id, depth + 1 "
+ " FROM fragment child INNER JOIN parent_search parent ON child.parent_id = parent.id"
+ " WHERE depth < ?"
+ ") "
+ "SELECT fragment.id, anchor_id AS anchorId, xpath, parent_id AS parentId, "
+ " CAST(attributes AS TEXT) AS attributes "
+ "FROM fragment INNER JOIN parent_search ON fragment.id = parent_search.id";
final PreparedStatementSetter preparedStatementSetter = preparedStatement -> {
final Connection connection = preparedStatement.getConnection();
final java.sql.Array idArray = connection.createArrayOf("bigint", fragmentEntityIds.toArray());
preparedStatement.setArray(1, idArray);
preparedStatement.setInt(2, maxDepth);
};
final RowMapper<FragmentEntity> fragmentEntityRowMapper = (resultSet, rowNum) -> {
final FragmentEntity fragmentEntity = new FragmentEntity();
fragmentEntity.setId(resultSet.getLong("id"));
fragmentEntity.setXpath(resultSet.getString("xpath"));
fragmentEntity.setParentId(resultSet.getLong("parentId"));
fragmentEntity.setAttributes(resultSet.getString("attributes"));
fragmentEntity.setAnchor(anchorEntityPerId.get(resultSet.getLong("anchorId")));
fragmentEntity.setChildFragments(new HashSet<>());
return fragmentEntity;
};
final Map<Long, FragmentEntity> fragmentEntityPerId;
try (final Stream<FragmentEntity> fragmentEntityStream = jdbcTemplate.queryForStream(sql,
preparedStatementSetter, fragmentEntityRowMapper)) {
fragmentEntityPerId = fragmentEntityStream.collect(
Collectors.toMap(FragmentEntity::getId, Function.identity()));
}
return reuniteChildrenWithTheirParents(fragmentEntityPerId);
}
private static Collection<FragmentEntity> reuniteChildrenWithTheirParents(
final Map<Long, FragmentEntity> fragmentEntityPerId) {
final Collection<FragmentEntity> fragmentEntitiesWithoutParent = new HashSet<>();
for (final FragmentEntity fragmentEntity : fragmentEntityPerId.values()) {
final FragmentEntity parentFragmentEntity = fragmentEntityPerId.get(fragmentEntity.getParentId());
if (parentFragmentEntity == null) {
fragmentEntitiesWithoutParent.add(fragmentEntity);
} else {
parentFragmentEntity.getChildFragments().add(fragmentEntity);
}
}
return fragmentEntitiesWithoutParent;
}
}
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