Convert ChangeInserter to the builder pattern

Like PatchSetInserter, the goal is to cut down on proliferating
methods and reuse this code from more places. However, because of the
way it is currently used from ReceiveCommits, some things like commit
validation and ref updates will be harder to move into ChangeInserter.

Change-Id: I457c92ffeb7f5de1fa9aa8f0da21e4b2b3fed1b1

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeInserter.java

@@ -26,8 +26,11 @@ import com.google.gerrit.server.ApprovalsUtil;
 import com.google.gerrit.server.ChangeUtil;
 import com.google.gerrit.server.config.TrackingFooters;
 import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
+import com.google.gerrit.server.project.RefControl;
 import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.assistedinject.Assisted;
 
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.revwalk.RevCommit;
@@ -36,40 +39,72 @@ import java.util.Collections;
 import java.util.Set;
 
 public class ChangeInserter {
+  public static interface Factory {
+    ChangeInserter create(RefControl ctl, Change c, PatchSet ps, RevCommit rc,
+        PatchSetInfo psi);
+  }
+
+  private final Provider<ReviewDb> dbProvider;
   private final GitReferenceUpdated gitRefUpdated;
   private final ChangeHooks hooks;
   private final ApprovalsUtil approvalsUtil;
   private final TrackingFooters trackingFooters;
 
+  private final RefControl refControl;
+  private final Change change;
+  private final PatchSet patchSet;
+  private final RevCommit commit;
+  private final PatchSetInfo patchSetInfo;
+
+  private ChangeMessage changeMessage;
+  private Set<Account.Id> reviewers;
+
   @Inject
-  public ChangeInserter(final GitReferenceUpdated gitRefUpdated,
-      ChangeHooks hooks, ApprovalsUtil approvalsUtil,
-      TrackingFooters trackingFooters) {
+  ChangeInserter(Provider<ReviewDb> dbProvider,
+      GitReferenceUpdated gitRefUpdated,
+      ChangeHooks hooks,
+      ApprovalsUtil approvalsUtil,
+      TrackingFooters trackingFooters,
+      @Assisted RefControl refControl,
+      @Assisted Change change,
+      @Assisted PatchSet patchSet,
+      @Assisted RevCommit commit,
+      @Assisted PatchSetInfo patchSetInfo) {
+    this.dbProvider = dbProvider;
     this.gitRefUpdated = gitRefUpdated;
     this.hooks = hooks;
     this.approvalsUtil = approvalsUtil;
     this.trackingFooters = trackingFooters;
+    this.refControl = refControl;
+    this.change = change;
+    this.patchSet = patchSet;
+    this.commit = commit;
+    this.patchSetInfo = patchSetInfo;
+
+    this.reviewers = Collections.emptySet();
   }
 
-  public void insertChange(ReviewDb db, Change change, PatchSet ps,
-      RevCommit commit, LabelTypes labelTypes, PatchSetInfo info,
-      Set<Account.Id> reviewers) throws OrmException {
-    insertChange(db, change, null, ps, commit, labelTypes, info, reviewers);
+  public ChangeInserter setMessage(ChangeMessage changeMessage) {
+    this.changeMessage = changeMessage;
+    return this;
   }
 
-  public void insertChange(ReviewDb db, Change change,
-      ChangeMessage changeMessage, PatchSet ps, RevCommit commit,
-      LabelTypes labelTypes, PatchSetInfo info, Set<Account.Id> reviewers)
-      throws OrmException {
+  public ChangeInserter setReviewers(Set<Account.Id> reviewers) {
+    this.reviewers = reviewers;
+    return this;
+  }
 
+  public void insert() throws OrmException {
+    ReviewDb db = dbProvider.get();
     db.changes().beginTransaction(change.getId());
     try {
-      ChangeUtil.insertAncestors(db, ps.getId(), commit);
-      db.patchSets().insert(Collections.singleton(ps));
+      ChangeUtil.insertAncestors(db, patchSet.getId(), commit);
+      db.patchSets().insert(Collections.singleton(patchSet));
       db.changes().insert(Collections.singleton(change));
       ChangeUtil.updateTrackingIds(db, change, trackingFooters, commit.getFooterLines());
-      approvalsUtil.addReviewers(db, labelTypes, change, ps, info, reviewers,
-          Collections.<Account.Id> emptySet());
+      LabelTypes labelTypes = refControl.getProjectControl().getLabelTypes();
+      approvalsUtil.addReviewers(db, labelTypes, change, patchSet, patchSetInfo,
+          reviewers, Collections.<Account.Id> emptySet());
       db.commit();
     } finally {
       db.rollback();
@@ -78,8 +113,8 @@ public class ChangeInserter {
       db.changeMessages().insert(Collections.singleton(changeMessage));
     }
 
-    gitRefUpdated.fire(change.getProject(), ps.getRefName(), ObjectId.zeroId(),
-        commit);
-    hooks.doPatchsetCreatedHook(change, ps, db);
+    gitRefUpdated.fire(change.getProject(), patchSet.getRefName(),
+        ObjectId.zeroId(), commit);
+    hooks.doPatchsetCreatedHook(change, patchSet, db);
   }
 }