Use java.util.Optional in change edit paths

Change-Id: I75c39993b07f3c28f5c5df2f165887b2ca4a42d0

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/edit/ChangeEditIT.java

@@ -20,7 +20,6 @@ import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
@@ -87,6 +86,7 @@ import java.util.Date;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 
 public class ChangeEditIT extends AbstractDaemonTest {
 

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/CatServlet.java

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.httpd.raw;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.Url;
 import com.google.gerrit.reviewdb.client.Change;
@@ -33,6 +32,7 @@ import com.google.inject.Provider;
 import com.google.inject.Singleton;
 
 import java.io.IOException;
+import java.util.Optional;
 
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;

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

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.change;
 
-import com.google.common.base.Optional;
 import com.google.common.base.Strings;
 import com.google.common.collect.FluentIterable;
 import com.google.gerrit.common.Nullable;
@@ -65,6 +64,7 @@ import org.kohsuke.args4j.Option;
 
 import java.io.IOException;
 import java.util.List;
+import java.util.Optional;
 
 @Singleton
 public class ChangeEdits implements

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

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.change;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.Response;
@@ -27,6 +26,7 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 import java.io.IOException;
+import java.util.Optional;
 
 @Singleton
 public class DeleteChangeEdit implements RestModifyView<ChangeResource, Input> {

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

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.change;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.common.data.Capable;
 import com.google.gerrit.extensions.api.changes.PublishChangeEditInput;
 import com.google.gerrit.extensions.registration.DynamicMap;
@@ -37,6 +36,7 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 import java.io.IOException;
+import java.util.Optional;
 
 @Singleton
 public class PublishChangeEdit implements

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

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.change;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.extensions.registration.DynamicMap;
 import com.google.gerrit.extensions.restapi.AcceptsPost;
 import com.google.gerrit.extensions.restapi.AuthException;
@@ -39,6 +38,7 @@ import com.google.inject.Provider;
 import com.google.inject.Singleton;
 
 import java.io.IOException;
+import java.util.Optional;
 
 @Singleton
 public class RebaseChangeEdit implements

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

@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.change;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.extensions.restapi.RestResource;
 import com.google.gerrit.extensions.restapi.RestResource.HasETag;
 import com.google.gerrit.extensions.restapi.RestView;
@@ -28,6 +27,8 @@ import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.project.ChangeControl;
 import com.google.inject.TypeLiteral;
 
+import java.util.Optional;
+
 public class RevisionResource implements RestResource, HasETag {
   public static final TypeLiteral<RestView<RevisionResource>> REVISION_KIND =
       new TypeLiteral<RestView<RevisionResource>>() {};
@@ -38,7 +39,7 @@ public class RevisionResource implements RestResource, HasETag {
   private boolean cacheable = true;
 
   public RevisionResource(ChangeResource change, PatchSet ps) {
-    this(change, ps, Optional.<ChangeEdit> absent());
+    this(change, ps, Optional.empty());
   }
 
   public RevisionResource(ChangeResource change, PatchSet ps,

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

@@ -15,7 +15,6 @@
 package com.google.gerrit.server.change;
 
 import com.google.common.base.Joiner;
-import com.google.common.base.Optional;
 import com.google.common.collect.Lists;
 import com.google.gerrit.extensions.registration.DynamicMap;
 import com.google.gerrit.extensions.restapi.AuthException;
@@ -38,6 +37,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 @Singleton
 public class Revisions implements ChildCollection<ChangeResource, RevisionResource> {

gerrit-server/src/main/java/com/google/gerrit/server/edit/ChangeEditUtil.java

@@ -16,7 +16,6 @@ package com.google.gerrit.server.edit;
 
 import static com.google.common.base.Preconditions.checkArgument;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.common.TimeUtil;
 import com.google.gerrit.extensions.api.changes.NotifyHandling;
 import com.google.gerrit.extensions.client.ChangeKind;
@@ -56,6 +55,7 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 
 import java.io.IOException;
+import java.util.Optional;
 
 /**
  * Utility functions to manipulate change edits.
@@ -144,7 +144,7 @@ public class ChangeEditUtil {
       }
       Ref ref = repo.getRefDatabase().firstExactRef(refNames);
       if (ref == null) {
-        return Optional.absent();
+        return Optional.empty();
       }
       try (RevWalk rw = new RevWalk(repo)) {
         RevCommit commit = rw.parseCommit(ref.getObjectId());

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

@@ -33,7 +33,6 @@ import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTF
 import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
 
 import com.google.common.base.Function;
-import com.google.common.base.Optional;
 import com.google.common.base.Splitter;
 import com.google.common.base.Strings;
 import com.google.common.collect.ArrayListMultimap;
@@ -168,6 +167,7 @@ import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutionException;
 import java.util.regex.Matcher;

gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptFactory.java

@@ -16,7 +16,6 @@ package com.google.gerrit.server.patch;
 
 import static com.google.common.base.Preconditions.checkArgument;
 
-import com.google.common.base.Optional;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.common.data.CommentDetail;
 import com.google.gerrit.common.data.PatchScript;
@@ -59,6 +58,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.concurrent.Callable;