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diff --git a/java/com/google/gerrit/server/PatchSetUtil.java b/java/com/google/gerrit/server/PatchSetUtil.java
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+// Copyright (C) 2016 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;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.collect.ImmutableMap.toImmutableMap;
+import static com.google.gerrit.server.ChangeUtil.PS_ID_ORDER;
+import static com.google.gerrit.server.notedb.PatchSetState.PUBLISHED;
+import static java.util.Objects.requireNonNull;
+import static java.util.function.Function.identity;
+
+import com.google.common.collect.ImmutableCollection;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import com.google.common.collect.Streams;
+import com.google.gerrit.common.data.LabelFunction;
+import com.google.gerrit.common.data.LabelType;
+import com.google.gerrit.extensions.restapi.ResourceConflictException;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.reviewdb.client.PatchSetApproval;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.client.RevId;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.notedb.ChangeUpdate;
+import com.google.gerrit.server.notedb.NotesMigration;
+import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectState;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
+
+/** Utilities for manipulating patch sets. */
+@Singleton
+public class PatchSetUtil {
+  private final NotesMigration migration;
+  private final Provider<ApprovalsUtil> approvalsUtilProvider;
+  private final ProjectCache projectCache;
+  private final Provider<ReviewDb> dbProvider;
+  private final GitRepositoryManager repoManager;
+
+  @Inject
+  PatchSetUtil(
+      NotesMigration migration,
+      Provider<ApprovalsUtil> approvalsUtilProvider,
+      ProjectCache projectCache,
+      Provider<ReviewDb> dbProvider,
+      GitRepositoryManager repoManager) {
+    this.migration = migration;
+    this.approvalsUtilProvider = approvalsUtilProvider;
+    this.projectCache = projectCache;
+    this.dbProvider = dbProvider;
+    this.repoManager = repoManager;
+  }
+
+  public PatchSet current(ReviewDb db, ChangeNotes notes) throws OrmException {
+    return get(db, notes, notes.getChange().currentPatchSetId());
+  }
+
+  public PatchSet get(ReviewDb db, ChangeNotes notes, PatchSet.Id psId) throws OrmException {
+    if (!migration.readChanges()) {
+      return db.patchSets().get(psId);
+    }
+    return notes.load().getPatchSets().get(psId);
+  }
+
+  public ImmutableCollection<PatchSet> byChange(ReviewDb db, ChangeNotes notes)
+      throws OrmException {
+    if (!migration.readChanges()) {
+      return PS_ID_ORDER.immutableSortedCopy(db.patchSets().byChange(notes.getChangeId()));
+    }
+    return notes.load().getPatchSets().values();
+  }
+
+  public ImmutableMap<PatchSet.Id, PatchSet> byChangeAsMap(ReviewDb db, ChangeNotes notes)
+      throws OrmException {
+    if (!migration.readChanges()) {
+      ImmutableMap.Builder<PatchSet.Id, PatchSet> result = ImmutableMap.builder();
+      for (PatchSet ps : PS_ID_ORDER.sortedCopy(db.patchSets().byChange(notes.getChangeId()))) {
+        result.put(ps.getId(), ps);
+      }
+      return result.build();
+    }
+    return notes.load().getPatchSets();
+  }
+
+  public ImmutableMap<PatchSet.Id, PatchSet> getAsMap(
+      ReviewDb db, ChangeNotes notes, Set<PatchSet.Id> patchSetIds) throws OrmException {
+    if (!migration.readChanges()) {
+      patchSetIds = Sets.filter(patchSetIds, p -> p.getParentKey().equals(notes.getChangeId()));
+      return Streams.stream(db.patchSets().get(patchSetIds))
+          .sorted(PS_ID_ORDER)
+          .collect(toImmutableMap(PatchSet::getId, identity()));
+    }
+    return ImmutableMap.copyOf(Maps.filterKeys(notes.load().getPatchSets(), patchSetIds::contains));
+  }
+
+  public PatchSet insert(
+      ReviewDb db,
+      RevWalk rw,
+      ChangeUpdate update,
+      PatchSet.Id psId,
+      ObjectId commit,
+      List<String> groups,
+      String pushCertificate,
+      String description)
+      throws OrmException, IOException {
+    requireNonNull(groups, "groups may not be null");
+    ensurePatchSetMatches(psId, update);
+
+    PatchSet ps = new PatchSet(psId);
+    ps.setRevision(new RevId(commit.name()));
+    ps.setUploader(update.getAccountId());
+    ps.setCreatedOn(new Timestamp(update.getWhen().getTime()));
+    ps.setGroups(groups);
+    ps.setPushCertificate(pushCertificate);
+    ps.setDescription(description);
+    db.patchSets().insert(Collections.singleton(ps));
+
+    update.setCommit(rw, commit, pushCertificate);
+    update.setPsDescription(description);
+    update.setGroups(groups);
+
+    return ps;
+  }
+
+  public void publish(ReviewDb db, ChangeUpdate update, PatchSet ps) throws OrmException {
+    ensurePatchSetMatches(ps.getId(), update);
+    update.setPatchSetState(PUBLISHED);
+    db.patchSets().update(Collections.singleton(ps));
+  }
+
+  private static void ensurePatchSetMatches(PatchSet.Id psId, ChangeUpdate update) {
+    Change.Id changeId = update.getChange().getId();
+    checkArgument(
+        psId.getParentKey().equals(changeId),
+        "cannot modify patch set %s on update for change %s",
+        psId,
+        changeId);
+    if (update.getPatchSetId() != null) {
+      checkArgument(
+          update.getPatchSetId().equals(psId),
+          "cannot modify patch set %s on update for %s",
+          psId,
+          update.getPatchSetId());
+    } else {
+      update.setPatchSetId(psId);
+    }
+  }
+
+  public void setGroups(ReviewDb db, ChangeUpdate update, PatchSet ps, List<String> groups)
+      throws OrmException {
+    ps.setGroups(groups);
+    update.setGroups(groups);
+    db.patchSets().update(Collections.singleton(ps));
+  }
+
+  /** Check if the current patch set of the change is locked. */
+  public void checkPatchSetNotLocked(ChangeNotes notes)
+      throws OrmException, IOException, ResourceConflictException {
+    if (isPatchSetLocked(notes)) {
+      throw new ResourceConflictException(
+          String.format("The current patch set of change %s is locked", notes.getChangeId()));
+    }
+  }
+
+  /** Is the current patch set locked against state changes? */
+  public boolean isPatchSetLocked(ChangeNotes notes) throws OrmException, IOException {
+    Change change = notes.getChange();
+    if (change.getStatus() == Change.Status.MERGED) {
+      return false;
+    }
+
+    ProjectState projectState = projectCache.checkedGet(notes.getProjectName());
+    requireNonNull(
+        projectState, () -> String.format("Failed to load project %s", notes.getProjectName()));
+
+    ApprovalsUtil approvalsUtil = approvalsUtilProvider.get();
+    for (PatchSetApproval ap :
+        approvalsUtil.byPatchSet(dbProvider.get(), notes, change.currentPatchSetId(), null, null)) {
+      LabelType type = projectState.getLabelTypes(notes).byLabel(ap.getLabel());
+      if (type != null
+          && ap.getValue() == 1
+          && type.getFunction() == LabelFunction.PATCH_SET_LOCK) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /** Returns the commit for the given project at the given patchset revision */
+  public RevCommit getRevCommit(Project.NameKey project, PatchSet patchSet) throws IOException {
+    try (Repository repo = repoManager.openRepository(project);
+        RevWalk rw = new RevWalk(repo)) {
+      RevCommit src = rw.parseCommit(ObjectId.fromString(patchSet.getRevision().get()));
+      rw.parseBody(src);
+      return src;
+    }
+  }
+}