org.openlca.git.actions.GitMerge Maven / Gradle / Ivy
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package org.openlca.git.actions;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.stream.Collectors;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.openlca.core.library.Library;
import org.openlca.core.library.Mounter;
import org.openlca.core.library.PreMountCheck;
import org.openlca.core.library.Unmounter;
import org.openlca.git.Compatibility;
import org.openlca.git.Compatibility.UnsupportedClientVersionException;
import org.openlca.git.RepositoryInfo;
import org.openlca.git.actions.GitMerge.MergeResult;
import org.openlca.git.model.Change;
import org.openlca.git.model.Commit;
import org.openlca.git.model.Diff;
import org.openlca.git.model.DiffType;
import org.openlca.git.model.Reference;
import org.openlca.git.repo.ClientRepository;
import org.openlca.git.util.Constants;
import org.openlca.git.util.ModelRefSet;
import org.openlca.git.writer.DbCommitWriter;
import org.openlca.jsonld.LibraryLink;
public class GitMerge extends GitProgressAction {
private final ClientRepository repo;
private PersonIdent committer;
private ConflictResolver conflictResolver = ConflictResolver.NULL;
private LibraryResolver libraryResolver;
private boolean applyStash;
private Commit localCommit;
private Commit remoteCommit;
private RepositoryInfo info;
private List diffs;
private List mergeResults = new ArrayList<>();
private GitMerge(ClientRepository repo) {
this.repo = repo;
}
public static GitMerge on(ClientRepository repo) {
return new GitMerge(repo);
}
public GitMerge as(PersonIdent committer) {
this.committer = committer;
return this;
}
public GitMerge resolveConflictsWith(ConflictResolver conflictResolver) {
this.conflictResolver = conflictResolver != null ? conflictResolver : ConflictResolver.NULL;
return this;
}
public GitMerge resolveLibrariesWith(LibraryResolver libraryResolver) {
this.libraryResolver = libraryResolver;
return this;
}
GitMerge applyStash() {
this.applyStash = true;
return this;
}
@Override
public MergeResult run() throws IOException, GitAPIException {
if (!prepare())
return MergeResult.NO_CHANGES;
var mountResult = mountLibraries();
if (mountResult == MergeResult.MOUNT_ERROR || mountResult == MergeResult.ABORTED)
return mountResult;
var imported = importData();
deleteData(imported);
unmountLibraries();
progressMonitor.beginTask("Reloading descriptors");
repo.descriptors.reload();
if (applyStash)
return MergeResult.SUCCESS;
var ahead = repo.localHistory.getAheadOf(Constants.REMOTE_REF);
if (ahead.isEmpty()) {
updateHead();
} else {
createMergeCommit();
}
return MergeResult.SUCCESS;
}
private boolean prepare() throws GitAPIException, UnsupportedClientVersionException {
if (repo == null || repo.database == null)
throw new IllegalStateException("Git repository and database must be set");
Compatibility.checkRepositoryClientVersion(repo);
var ref = applyStash
? org.eclipse.jgit.lib.Constants.R_STASH
: Constants.REMOTE_REF;
var behind = repo.localHistory.getBehindOf(ref);
if (behind.isEmpty())
return false;
localCommit = repo.commits.get(repo.commits.resolve(Constants.LOCAL_BRANCH));
remoteCommit = getRemoteCommit();
if (remoteCommit == null)
return false;
var commonParent = repo.localHistory.commonParentOf(ref);
diffs = repo.diffs.find().commit(commonParent).with(remoteCommit);
info = localCommit != null
? repo.getInfo(localCommit).merge(repo.getInfo(remoteCommit))
: repo.getInfo(remoteCommit);
return true;
}
private List importData() {
var addedOrChanged = diffs.stream()
.filter(d -> d.diffType != DiffType.DELETED)
.map(d -> d.newRef)
.collect(Collectors.toList());
if (addedOrChanged.isEmpty())
return addedOrChanged;
var gitStore = new GitStoreReader(repo, localCommit, remoteCommit, addedOrChanged, conflictResolver);
var mergeResults = ImportData.from(gitStore)
.with(progressMonitor)
.into(repo.database)
.run();
this.mergeResults.addAll(mergeResults);
return addedOrChanged;
}
private void deleteData(List imported) {
// if a dataset was added and deleted it means that it was moved, the
// add will result in an updated dataset when during importData() so
// skip the delete in these cases
var dontDelete = new ModelRefSet(imported);
var deleted = diffs.stream()
.filter(d -> d.diffType == DiffType.DELETED)
.filter(d -> !dontDelete.contains(d))
.map(d -> d.oldRef)
.collect(Collectors.toList());
if (deleted.isEmpty())
return;
var mergeResults = DeleteData.from(repo.database)
.with(progressMonitor)
.with(conflictResolver)
.data(deleted)
.run();
this.mergeResults.addAll(mergeResults);
}
private Commit getRemoteCommit() throws GitAPIException {
if (!applyStash)
return repo.commits.get(repo.commits.resolve(Constants.REMOTE_BRANCH));
return repo.commits.stash();
}
private String createMergeCommit() throws IOException {
return new DbCommitWriter(repo)
.as(committer)
.merge(localCommit.id, remoteCommit.id)
.write("Merge remote-tracking branch", mergeResults);
}
private void updateHead() throws IOException {
var update = repo.updateRef(Constants.LOCAL_BRANCH);
update.setNewObjectId(ObjectId.fromString(remoteCommit.id));
update.update();
progressMonitor.beginTask("Updating local index");
repo.index.reload();
}
private MergeResult mountLibraries() {
var newLibraries = resolveNewLibraries();
if (newLibraries.size() == 0)
return MergeResult.NO_CHANGES;
progressMonitor.beginTask("Mounting libraries");
var queue = new ArrayDeque<>(newLibraries);
var handled = new HashSet();
while (!queue.isEmpty()) {
var next = queue.poll();
progressMonitor.subTask(next.name());
if (handled.contains(next))
continue;
handled.add(next);
var checkResult = PreMountCheck.check(repo.database, next);
if (checkResult.isError())
return MergeResult.MOUNT_ERROR;
checkResult.getStates().forEach(p -> handled.add(p.first));
Mounter.of(repo.database, next)
.applyDefaultsOf(checkResult)
.run();
}
return MergeResult.SUCCESS;
}
private List resolveNewLibraries() {
if (info == null)
return new ArrayList<>();
var remoteLibs = info.libraries().stream().map(LibraryLink::id).toList();
var localLibs = repo.database.getLibraries();
var libs = new ArrayList();
for (var remoteLib : remoteLibs) {
if (localLibs.contains(remoteLib))
continue;
if (libraryResolver == null)
throw new IllegalStateException("Could not mount libraries because no library resolver was set");
var lib = libraryResolver.resolve(remoteLib);
if (lib == null)
return null;
libs.add(lib);
}
return libs;
}
private void unmountLibraries() {
var libraries = resolveObsoleteLibraries();
var unmounter = new Unmounter(repo.database);
for (var lib : libraries) {
unmounter.unmountUnsafe(lib);
}
}
private List resolveObsoleteLibraries() {
if (info == null)
return new ArrayList<>();
var remoteLibs = info.libraries().stream().map(LibraryLink::id).toList();
var localLibs = repo.database.getLibraries();
var libs = new ArrayList();
for (var localLib : localLibs) {
if (remoteLibs.contains(localLib))
continue;
libs.add(localLib);
}
return libs;
}
public static enum MergeResult {
NO_CHANGES, SUCCESS, MOUNT_ERROR, ABORTED;
}
}