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// Copyright (C) 2021 The Android Open Source Project
//
// 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.
package com.google.gerrit.server.change;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.stream.Collectors.toSet;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.index.IndexConfig;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/** Utility class that gets the ancestor changes and the descendent changes of a specific change. */
@Singleton
public class GetRelatedChangesUtil {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final Provider queryProvider;
private final RelatedChangesSorter sorter;
private final IndexConfig indexConfig;
private final ChangeData.Factory changeDataFactory;
@Inject
GetRelatedChangesUtil(
Provider queryProvider,
RelatedChangesSorter sorter,
IndexConfig indexConfig,
ChangeData.Factory changeDataFactory) {
this.queryProvider = queryProvider;
this.sorter = sorter;
this.indexConfig = indexConfig;
this.changeDataFactory = changeDataFactory;
}
/**
* Gets related changes of a specific change revision.
*
* @param changeData the change of the inputted revision.
* @param basePs the revision that the method checks for related changes.
* @return list of related changes, sorted via {@link RelatedChangesSorter}
*/
public List getRelated(ChangeData changeData, PatchSet basePs)
throws IOException, PermissionBackendException {
List cds = getUnsortedRelated(changeData, basePs, false);
if (cds.isEmpty()) {
return Collections.emptyList();
}
return sorter.sort(cds, basePs);
}
/**
* Gets ancestor changes of a specific change revision.
*
* @param changeData the change of the inputted revision.
* @param basePs the revision that the method checks for related changes.
* @param alwaysIncludeOriginalChange whether to return the given change when no ancestors found.
* @return list of ancestor changes, sorted via {@link RelatedChangesSorter}
*/
public List getAncestors(
ChangeData changeData, PatchSet basePs, boolean alwaysIncludeOriginalChange)
throws IOException, PermissionBackendException {
List cds = getUnsortedRelated(changeData, basePs, alwaysIncludeOriginalChange);
if (cds.isEmpty()) {
return Collections.emptyList();
}
return sorter.sortAncestors(cds, basePs);
}
private List getUnsortedRelated(
ChangeData changeData, PatchSet basePs, boolean alwaysIncludeOriginalChange) {
Set groups = getAllGroups(changeData.patchSets());
logger.atFine().log("groups = %s", groups);
if (groups.isEmpty()) {
return Collections.emptyList();
}
List cds =
InternalChangeQuery.byProjectGroups(
queryProvider, indexConfig, changeData.project(), groups);
if (cds.isEmpty()) {
return Collections.emptyList();
}
if (cds.size() == 1 && cds.get(0).getId().equals(changeData.getId())) {
return alwaysIncludeOriginalChange ? cds : Collections.emptyList();
}
return reloadChangeIfStale(cds, changeData, basePs);
}
private List reloadChangeIfStale(
List changeDatasFromIndex, ChangeData wantedChange, PatchSet wantedPs) {
checkArgument(
wantedChange.getId().equals(wantedPs.id().changeId()),
"change of wantedPs (%s) doesn't match wantedChange (%s)",
wantedPs.id().changeId(),
wantedChange.getId());
List changeDatas = new ArrayList<>(changeDatasFromIndex.size() + 1);
changeDatas.addAll(changeDatasFromIndex);
// Reload the change in case the patch set is absent.
changeDatas.stream()
.filter(
cd -> cd.getId().equals(wantedPs.id().changeId()) && cd.patchSet(wantedPs.id()) == null)
.forEach(ChangeData::reloadChange);
if (changeDatas.stream().noneMatch(cd -> cd.getId().equals(wantedPs.id().changeId()))) {
// The change of the wanted patch set is missing in the result from the index.
// Load it from NoteDb and add it to the result.
changeDatas.add(changeDataFactory.create(wantedChange.change()));
}
return changeDatas;
}
@VisibleForTesting
public static Set getAllGroups(Collection patchSets) {
return patchSets.stream().flatMap(ps -> ps.groups().stream()).collect(toSet());
}
}
