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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022 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.entities;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class FragmentEntityArranger {
/**
* Convert a collection of (related) FragmentExtracts into FragmentEntities (trees) with descendants.
*
* @param anchorEntity the anchor(entity) all the fragments belong to
* @param fragmentExtracts FragmentExtracts to convert
* @return a collection of FragmentEntities (trees) with descendants.
*/
public static Collection<FragmentEntity> toFragmentEntityTrees(final AnchorEntity anchorEntity,
final Collection<FragmentExtract> fragmentExtracts) {
final Map<Long, FragmentEntity> fragmentEntityPerId = new HashMap<>();
for (final FragmentExtract fragmentExtract : fragmentExtracts) {
final FragmentEntity fragmentEntity = toFragmentEntity(anchorEntity, fragmentExtract);
fragmentEntityPerId.put(fragmentEntity.getId(), fragmentEntity);
}
return reuniteChildrenWithTheirParents(fragmentEntityPerId);
}
private static FragmentEntity toFragmentEntity(final AnchorEntity anchorEntity,
final FragmentExtract fragmentExtract) {
final FragmentEntity fragmentEntity = new FragmentEntity();
if (anchorEntity != null) {
fragmentEntity.setAnchor(anchorEntity);
fragmentEntity.setDataspace(anchorEntity.getDataspace());
}
fragmentEntity.setId(fragmentExtract.getId());
fragmentEntity.setXpath(fragmentExtract.getXpath());
fragmentEntity.setAttributes(fragmentExtract.getAttributes());
fragmentEntity.setParentId(fragmentExtract.getParentId());
fragmentEntity.setChildFragments(new HashSet<>());
return fragmentEntity;
}
private static Collection<FragmentEntity> reuniteChildrenWithTheirParents(
final Map<Long, FragmentEntity> fragmentEntityPerId) {
final Collection<FragmentEntity> fragmentEntitiesWithoutParentInResultSet = new HashSet<>();
for (final FragmentEntity fragmentEntity : fragmentEntityPerId.values()) {
final FragmentEntity parentFragmentEntity = fragmentEntityPerId.get(fragmentEntity.getParentId());
if (parentFragmentEntity == null) {
fragmentEntitiesWithoutParentInResultSet.add(fragmentEntity);
} else {
parentFragmentEntity.getChildFragments().add(fragmentEntity);
}
}
return fragmentEntitiesWithoutParentInResultSet;
}
}
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