Rework SUBM label in LabelId

Use a static method instead of a public LabelId field. LabelId is
mutable, so naming it like a constant is misleading at best. At worst,
a caller could call SUBMIT.set(newValue) and change the value seen by
all callers in the process. (Fortunately no callers were doing this as
far as I could tell.)

While we're in there, rename methods to refer to this as a "legacy"
submit label, as we want to eventually get rid of it in NoteDb.

Change-Id: Id7fbddfaac1d625839c66c73231d4e4ba2550c50

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/git/SubmitOnPushIT.java

@@ -225,7 +225,7 @@ public class SubmitOnPushIT extends AbstractDaemonTest {
 
   private void assertSubmitApproval(PatchSet.Id patchSetId) throws Exception {
     PatchSetApproval a = getSubmitter(patchSetId);
-    assertThat(a.isSubmit()).isTrue();
+    assertThat(a.isLegacySubmit()).isTrue();
     assertThat(a.getValue()).isEqualTo((short) 1);
     assertThat(a.getAccountId()).isEqualTo(admin.id);
   }

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/change/AbstractSubmit.java

@@ -356,7 +356,7 @@ public abstract class AbstractSubmit extends AbstractDaemonTest {
     PatchSetApproval submitter = approvalsUtil.getSubmitter(
         db, cn, new PatchSet.Id(cn.getChangeId(), psId));
     assertThat(submitter).isNotNull();
-    assertThat(submitter.isSubmit()).isTrue();
+    assertThat(submitter.isLegacySubmit()).isTrue();
     assertThat(submitter.getAccountId()).isEqualTo(admin.getId());
   }
 

gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/LabelId.java

@@ -20,7 +20,11 @@ import com.google.gwtorm.client.StringKey;
 public class LabelId extends StringKey<com.google.gwtorm.client.Key<?>> {
   private static final long serialVersionUID = 1L;
 
-  public static final LabelId SUBMIT = new LabelId("SUBM");
+  static final String LEGACY_SUBMIT_NAME = "SUBM";
+
+  public static LabelId legacySubmit() {
+    return new LabelId(LEGACY_SUBMIT_NAME);
+  }
 
   @Column(id = 1)
   public String id;

gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/PatchSetApproval.java

@@ -149,8 +149,8 @@ public final class PatchSetApproval {
     return getLabelId().get();
   }
 
-  public boolean isSubmit() {
-    return LabelId.SUBMIT.get().equals(getLabel());
+  public boolean isLegacySubmit() {
+    return LabelId.LEGACY_SUBMIT_NAME.equals(getLabel());
   }
 
   @Override

gerrit-server/src/main/java/com/google/gerrit/server/ApprovalsUtil.java

@@ -321,7 +321,7 @@ public class ApprovalsUtil {
     }
     PatchSetApproval submitter = null;
     for (PatchSetApproval a : approvals) {
-      if (a.getPatchSetId().equals(c) && a.getValue() > 0 && a.isSubmit()) {
+      if (a.getPatchSetId().equals(c) && a.getValue() > 0 && a.isLegacySubmit()) {
         if (submitter == null
             || a.getGranted().compareTo(submitter.getGranted()) > 0) {
           submitter = a;

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

@@ -611,7 +611,7 @@ public class PostReview implements RestModifyView<RevisionResource, ReviewInput>
 
       for (PatchSetApproval a : approvalsUtil.byPatchSetUser(
           ctx.getDb(), ctx.getControl(), psId, user.getAccountId())) {
-        if (a.isSubmit()) {
+        if (a.isLegacySubmit()) {
           continue;
         }
 

gerrit-server/src/main/java/com/google/gerrit/server/git/LabelNormalizer.java

@@ -127,7 +127,7 @@ public class LabelNormalizer {
       checkArgument(changeId.equals(ctl.getId()),
           "Approval %s does not match change %s",
           psa.getKey(), ctl.getChange().getKey());
-      if (psa.isSubmit()) {
+      if (psa.isLegacySubmit()) {
         unchanged.add(psa);
         continue;
       }

gerrit-server/src/main/java/com/google/gerrit/server/git/MergeUtil.java

@@ -253,7 +253,7 @@ public class MergeUtil {
         continue;
       }
 
-      if (a.isSubmit()) {
+      if (a.isLegacySubmit()) {
         // Submit is treated specially, below (becomes committer)
         //
         if (submitAudit == null

gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java

@@ -2565,7 +2565,7 @@ public class ReceiveCommits {
                 new PatchSetApproval.Key(
                     change.currentPatchSetId(),
                     ctx.getUser().getAccountId(),
-                    LabelId.SUBMIT),
+                    LabelId.legacySubmit()),
                     (short) 1, ctx.getWhen());
           update.putApproval(submitter.getLabel(), submitter.getValue());
           ctx.getDb().patchSetApprovals().upsert(

gerrit-server/src/main/java/com/google/gerrit/server/git/ReplaceOp.java

@@ -301,7 +301,7 @@ public class ReplaceOp extends BatchUpdate.Op {
       for (PatchSetApproval a : approvalsUtil.byPatchSetUser(ctx.getDb(),
           ctx.getControl(), priorPatchSetId,
           ctx.getUser().getAccountId())) {
-        if (a.isSubmit()) {
+        if (a.isLegacySubmit()) {
           continue;
         }
 

gerrit-server/src/main/java/com/google/gerrit/server/git/strategy/SubmitStrategyOp.java

@@ -337,7 +337,7 @@ abstract class SubmitStrategyOp extends BatchUpdate.Op {
           new PatchSetApproval.Key(
               psId,
               ctx.getUser().getAccountId(),
-              LabelId.SUBMIT),
+              LabelId.legacySubmit()),
               (short) 1, ctx.getWhen());
     byKey.put(submitter.getKey(), submitter);
     submitter.setValue((short) 1);
@@ -373,7 +373,7 @@ abstract class SubmitStrategyOp extends BatchUpdate.Op {
     // TODO(dborowitz): Don't use a label in notedb; just check when status
     // change happened.
     for (PatchSetApproval psa : normalized.unchanged()) {
-      if (includeUnchanged || psa.isSubmit()) {
+      if (includeUnchanged || psa.isLegacySubmit()) {
         logDebug("Adding submit label " + psa);
         update.putApprovalFor(
             psa.getAccountId(), psa.getLabel(), psa.getValue());

gerrit-server/src/main/java/com/google/gerrit/server/index/ChangeField.java

@@ -359,7 +359,7 @@ public class ChangeField {
           Set<String> allApprovals = Sets.newHashSet();
           Set<String> distinctApprovals = Sets.newHashSet();
           for (PatchSetApproval a : input.currentApprovals()) {
-            if (a.getValue() != 0 && !a.isSubmit()) {
+            if (a.getValue() != 0 && !a.isLegacySubmit()) {
               allApprovals.add(formatLabel(a.getLabel(), a.getValue(),
                   a.getAccountId()));
               distinctApprovals.add(formatLabel(a.getLabel(), a.getValue()));

gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeData.java

@@ -857,7 +857,7 @@ public class ChangeData {
   public Optional<PatchSetApproval> getSubmitApproval()
     throws OrmException {
     for (PatchSetApproval psa : currentApprovals()) {
-      if (psa.isSubmit()) {
+      if (psa.isLegacySubmit()) {
         return Optional.fromNullable(psa);
       }
     }