Convert some Functions/Predicates to streams & lambdas (5)

Change-Id: I4eca94928d77a15a81678dcd91b8d6174b4f6ec3

gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/AbstractDaemonTest.java

@@ -20,7 +20,6 @@ import static com.google.gerrit.extensions.api.changes.SubmittedTogetherOption.N
 import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
 import static org.eclipse.jgit.lib.Constants.HEAD;
 
-import com.google.common.base.Function;
 import com.google.common.base.Optional;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
@@ -887,13 +886,7 @@ public abstract class AbstractDaemonTest {
   }
 
   private static Iterable<String> changeIds(Iterable<ChangeInfo> changes) {
-    return Iterables.transform(changes,
-        new Function<ChangeInfo, String>() {
-          @Override
-          public String apply(ChangeInfo input) {
-            return input.changeId;
-          }
-        });
+    return Iterables.transform(changes, i -> i.changeId);
   }
 
   protected void assertSubmittedTogether(String chId, String... expected)

gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java

@@ -24,7 +24,6 @@ import static com.google.gerrit.server.index.change.ChangeField.PROJECT;
 import static com.google.gerrit.server.index.change.ChangeIndexRewriter.CLOSED_STATUSES;
 import static com.google.gerrit.server.index.change.ChangeIndexRewriter.OPEN_STATUSES;
 
-import com.google.common.base.Function;
 import com.google.common.base.Throwables;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.FluentIterable;
@@ -585,17 +584,12 @@ public class LuceneChangeIndex implements ChangeIndex {
     cd.setStars(stars);
   }
 
-  private void decodeReviewers(Multimap<String, IndexableField> doc, ChangeData cd) {
+  private void decodeReviewers(Multimap<String, IndexableField> doc,
+      ChangeData cd) {
     cd.setReviewers(
         ChangeField.parseReviewerFieldValues(
             FluentIterable.from(doc.get(REVIEWER_FIELD))
-                .transform(
-                    new Function<IndexableField, String>() {
-                      @Override
-                      public String apply(IndexableField in) {
-                        return in.stringValue();
-                      }
-                    })));
+                .transform(IndexableField::stringValue)));
   }
 
   private static <T> List<T> decodeProtos(Multimap<String, IndexableField> doc,

gerrit-server/src/main/java/com/google/gerrit/server/project/ProjectState.java

@@ -17,6 +17,7 @@ package com.google.gerrit.server.project;
 import static com.google.gerrit.common.data.PermissionRule.Action.ALLOW;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
+import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
@@ -365,8 +366,8 @@ public class ProjectState {
    *         from the immediate parent of this project and progresses up the
    *         hierarchy to All-Projects.
    */
-  public Iterable<ProjectState> parents() {
-    return Iterables.skip(tree(), 1);
+  public FluentIterable<ProjectState> parents() {
+    return FluentIterable.from(tree()).skip(1);
   }
 
   public boolean isAllProjects() {

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/AdminSetParent.java

@@ -14,9 +14,6 @@
 
 package com.google.gerrit.sshd.commands;
 
-import com.google.common.base.Function;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Iterables;
 import com.google.gerrit.common.data.GlobalCapability;
 import com.google.gerrit.extensions.annotations.RequiresCapability;
 import com.google.gerrit.extensions.common.ProjectInfo;
@@ -200,15 +197,11 @@ final class AdminSetParent extends SshCommand {
     return childProjects;
   }
 
-  private Set<Project.NameKey> getAllParents(final Project.NameKey projectName) {
+  private Set<Project.NameKey> getAllParents(Project.NameKey projectName) {
     ProjectState ps = projectCache.get(projectName);
-    return ImmutableSet.copyOf(Iterables.transform(
-      ps != null ? ps.parents() : Collections.<ProjectState> emptySet(),
-      new Function<ProjectState, Project.NameKey> () {
-        @Override
-        public Project.NameKey apply(ProjectState in) {
-          return in.getProject().getNameKey();
+    if (ps == null) {
+      return Collections.emptySet();
     }
-      }));
+    return ps.parents().transform(s -> s.getProject().getNameKey()).toSet();
   }
 }

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/BanCommitCommand.java

@@ -16,7 +16,6 @@ package com.google.gerrit.sshd.commands;
 
 import static com.google.gerrit.sshd.CommandMetaData.Mode.MASTER_OR_SLAVE;
 
-import com.google.common.base.Function;
 import com.google.common.base.Joiner;
 import com.google.common.collect.Lists;
 import com.google.gerrit.extensions.restapi.RestApiException;
@@ -56,14 +55,8 @@ public class BanCommitCommand extends SshCommand {
   @Override
   protected void run() throws Failure {
     try {
-      BanCommit.Input input =
-          BanCommit.Input.fromCommits(Lists.transform(commitsToBan,
-              new Function<ObjectId, String>() {
-                @Override
-                public String apply(ObjectId oid) {
-                  return oid.getName();
-                }
-              }));
+      BanCommit.Input input = BanCommit.Input.fromCommits(
+          Lists.transform(commitsToBan, ObjectId::getName));
       input.reason = reason;
 
       BanResultInfo r = banCommit.apply(new ProjectResource(projectControl), input);

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/CreateAccountCommand.java

@@ -16,7 +16,6 @@ package com.google.gerrit.sshd.commands;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 
-import com.google.common.base.Function;
 import com.google.common.collect.Lists;
 import com.google.gerrit.common.data.GlobalCapability;
 import com.google.gerrit.extensions.annotations.RequiresCapability;
@@ -74,12 +73,7 @@ final class CreateAccountCommand extends SshCommand {
     input.name = fullName;
     input.sshKey = readSshKey();
     input.httpPassword = httpPassword;
-    input.groups = Lists.transform(groups, new Function<AccountGroup.Id, String>() {
-      @Override
-      public String apply(AccountGroup.Id id) {
-        return id.toString();
-      }
-    });
+    input.groups = Lists.transform(groups, AccountGroup.Id::toString);
     try {
       createAccountFactory.create(username).apply(TopLevelResource.INSTANCE, input);
     } catch (RestApiException e) {

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/CreateGroupCommand.java

@@ -14,8 +14,8 @@
 
 package com.google.gerrit.sshd.commands;
 
-import com.google.common.base.Function;
-import com.google.common.collect.FluentIterable;
+import static java.util.stream.Collectors.toList;
+
 import com.google.gerrit.common.data.GlobalCapability;
 import com.google.gerrit.extensions.annotations.RequiresCapability;
 import com.google.gerrit.extensions.api.groups.GroupInput;
@@ -123,30 +123,15 @@ final class CreateGroupCommand extends SshCommand {
 
   private void addMembers(GroupResource rsrc) throws RestApiException,
       OrmException, IOException {
-    AddMembers.Input input =
-        AddMembers.Input.fromMembers(FluentIterable
-            .from(initialMembers)
-            .transform(new Function<Account.Id, String>() {
-              @Override
-              public String apply(Account.Id id) {
-                return String.valueOf(id.get());
-              }
-            })
-            .toList());
+    AddMembers.Input input = AddMembers.Input.fromMembers(
+        initialMembers.stream().map(Object::toString).collect(toList()));
     addMembers.apply(rsrc, input);
   }
 
   private void addIncludedGroups(GroupResource rsrc) throws RestApiException,
       OrmException {
-    AddIncludedGroups.Input input =
-        AddIncludedGroups.Input.fromGroups(FluentIterable.from(initialGroups)
-            .transform(new Function<AccountGroup.UUID, String>() {
-              @Override
-              public String apply(AccountGroup.UUID id) {
-                return id.get();
-              }
-            }).toList());
-
+    AddIncludedGroups.Input input = AddIncludedGroups.Input.fromGroups(
+        initialGroups.stream().map(AccountGroup.UUID::get).collect(toList()));
     addIncludedGroups.apply(rsrc, input);
   }
 }

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/CreateProjectCommand.java

@@ -15,7 +15,6 @@
 package com.google.gerrit.sshd.commands;
 
 import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Function;
 import com.google.common.base.Splitter;
 import com.google.common.collect.Lists;
 import com.google.gerrit.common.data.GlobalCapability;
@@ -140,13 +139,7 @@ final class CreateProjectCommand extends SshCommand {
         ProjectInput input = new ProjectInput();
         input.name = projectName;
         if (ownerIds != null) {
-          input.owners = Lists.transform(ownerIds,
-            new Function<AccountGroup.UUID, String>() {
-              @Override
-              public String apply(AccountGroup.UUID uuid) {
-                return uuid.get();
-              }
-            });
+          input.owners = Lists.transform(ownerIds, AccountGroup.UUID::get);
         }
         if (newParent != null) {
           input.parent = newParent.getProject().getName();

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/SetMembersCommand.java

@@ -14,11 +14,10 @@
 
 package com.google.gerrit.sshd.commands;
 
-import com.google.common.base.Function;
-import com.google.common.base.Joiner;
+import static java.util.stream.Collectors.joining;
+import static java.util.stream.Collectors.toList;
+
 import com.google.common.base.MoreObjects;
-import com.google.common.collect.Iterables;
-import com.google.common.collect.Lists;
 import com.google.gerrit.extensions.restapi.IdString;
 import com.google.gerrit.extensions.restapi.TopLevelResource;
 import com.google.gerrit.reviewdb.client.Account;
@@ -110,55 +109,37 @@ public class SetMembersCommand extends SshCommand {
   private void reportMembersAction(String action, GroupResource group,
       List<Account.Id> accountIdList) throws UnsupportedEncodingException,
       IOException {
-    out.write(String.format(
-        "Members %s group %s: %s\n",
-        action,
-        group.getName(),
-        Joiner.on(", ").join(
-            Iterables.transform(accountIdList,
-                new Function<Account.Id, String>() {
-                  @Override
-                  public String apply(Account.Id accountId) {
-                    return MoreObjects.firstNonNull(accountCache.get(accountId)
-                        .getAccount().getPreferredEmail(), "n/a");
-                  }
-                }))).getBytes(ENC));
+    String names = accountIdList.stream()
+        .map(accountId ->
+            MoreObjects.firstNonNull(
+                accountCache.get(accountId).getAccount().getPreferredEmail(),
+                "n/a"))
+        .collect(joining(", "));
+    out.write(
+        String.format(
+                "Members %s group %s: %s\n", action, group.getName(), names)
+            .getBytes(ENC));
   }
 
   private void reportGroupsAction(String action, GroupResource group,
       List<AccountGroup.UUID> groupUuidList)
       throws UnsupportedEncodingException, IOException {
-    out.write(String.format(
-        "Groups %s group %s: %s\n",
-        action,
-        group.getName(),
-        Joiner.on(", ").join(
-            Iterables.transform(groupUuidList,
-                new Function<AccountGroup.UUID, String>() {
-                  @Override
-                  public String apply(AccountGroup.UUID uuid) {
-                    return groupCache.get(uuid).getName();
-                  }
-                }))).getBytes(ENC));
+    String names = groupUuidList.stream()
+      .map(uuid -> groupCache.get(uuid).getName())
+      .collect(joining(", "));
+    out.write(
+        String.format(
+                "Groups %s group %s: %s\n", action, group.getName(), names)
+            .getBytes(ENC));
   }
 
   private AddIncludedGroups.Input fromGroups(List<AccountGroup.UUID> accounts) {
-    return AddIncludedGroups.Input.fromGroups(Lists.newArrayList(Iterables
-        .transform(accounts, new Function<AccountGroup.UUID, String>() {
-          @Override
-          public String apply(AccountGroup.UUID uuid) {
-            return uuid.toString();
-          }
-        })));
+    return AddIncludedGroups.Input.fromGroups(
+        accounts.stream().map(Object::toString).collect(toList()));
   }
 
   private AddMembers.Input fromMembers(List<Account.Id> accounts) {
-    return AddMembers.Input.fromMembers(Lists.newArrayList(Iterables.transform(
-        accounts, new Function<Account.Id, String>() {
-          @Override
-          public String apply(Account.Id id) {
-            return id.toString();
-          }
-        })));
+    return AddMembers.Input.fromMembers(
+        accounts.stream().map(Object::toString).collect(toList()));
   }
 }

gerrit-util-http/src/test/java/com/google/gerrit/util/http/testutil/FakeHttpServletRequest.java

@@ -18,7 +18,6 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
-import com.google.common.base.Function;
 import com.google.common.base.Splitter;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.LinkedListMultimap;
@@ -143,18 +142,12 @@ public class FakeHttpServletRequest implements HttpServletRequest {
     return Iterables.getFirst(parameters.get(name), null);
   }
 
-  private static final Function<Collection<String>, String[]> STRING_COLLECTION_TO_ARRAY =
-      new Function<Collection<String>, String[]>() {
-        @Override
-        public String[] apply(Collection<String> values) {
-          return values.toArray(new String[0]);
-        }
-      };
-
   @Override
   public Map<String, String[]> getParameterMap() {
     return Collections.unmodifiableMap(
-        Maps.transformValues(parameters.asMap(), STRING_COLLECTION_TO_ARRAY));
+        Maps.transformValues(
+            parameters.asMap(),
+            vs -> vs.toArray(new String[0])));
   }
 
   @Override
@@ -164,7 +157,7 @@ public class FakeHttpServletRequest implements HttpServletRequest {
 
   @Override
   public String[] getParameterValues(String name) {
-    return STRING_COLLECTION_TO_ARRAY.apply(parameters.get(name));
+    return parameters.get(name).toArray(new String[0]);
   }
 
   public void setQueryString(String qs) {