Move remaining REST handlers into restapi subpackage

This moves most Collections and all RestViews for
{change,group,account,access} into server/restapi/ . These have to be
done a single change and end up in a single java_library as these four
groups use each other's code.

Resources are left in place, to maintain compatibility for plugins.

Some Json classes (ActionJson, ChangeJson, GroupJson) have many
dependencies on the server library, so they are left in the server
package.

Revisisons (the Collection for RevisionResource) is left in place, as
it is used in ActionJson

This reduces the giant server package from ~1200 to ~900 files.

Change-Id: Id0d9030ad2845d636875e6139a08243f8b624338

java/com/google/gerrit/server/restapi/group/GroupJson.java

@@ -0,0 +1,135 @@
+// Copyright (C) 2013 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.restapi.group;
+
+import static com.google.gerrit.extensions.client.ListGroupsOption.INCLUDES;
+import static com.google.gerrit.extensions.client.ListGroupsOption.MEMBERS;
+
+import com.google.common.base.Strings;
+import com.google.common.base.Suppliers;
+import com.google.gerrit.common.data.GroupDescription;
+import com.google.gerrit.extensions.client.ListGroupsOption;
+import com.google.gerrit.extensions.common.GroupInfo;
+import com.google.gerrit.extensions.common.GroupOptionsInfo;
+import com.google.gerrit.extensions.restapi.Url;
+import com.google.gerrit.reviewdb.client.AccountGroup;
+import com.google.gerrit.server.account.GroupBackend;
+import com.google.gerrit.server.account.GroupControl;
+import com.google.gerrit.server.group.GroupResource;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import java.util.Collection;
+import java.util.EnumSet;
+import java.util.function.Supplier;
+
+public class GroupJson {
+  public static GroupOptionsInfo createOptions(GroupDescription.Basic group) {
+    GroupOptionsInfo options = new GroupOptionsInfo();
+    if (group instanceof GroupDescription.Internal
+        && ((GroupDescription.Internal) group).isVisibleToAll()) {
+      options.visibleToAll = true;
+    }
+    return options;
+  }
+
+  private final GroupBackend groupBackend;
+  private final GroupControl.Factory groupControlFactory;
+  private final Provider<ListMembers> listMembers;
+  private final Provider<ListSubgroups> listSubgroups;
+  private EnumSet<ListGroupsOption> options;
+
+  @Inject
+  GroupJson(
+      GroupBackend groupBackend,
+      GroupControl.Factory groupControlFactory,
+      Provider<ListMembers> listMembers,
+      Provider<ListSubgroups> listSubgroups) {
+    this.groupBackend = groupBackend;
+    this.groupControlFactory = groupControlFactory;
+    this.listMembers = listMembers;
+    this.listSubgroups = listSubgroups;
+
+    options = EnumSet.noneOf(ListGroupsOption.class);
+  }
+
+  public GroupJson addOption(ListGroupsOption o) {
+    options.add(o);
+    return this;
+  }
+
+  public GroupJson addOptions(Collection<ListGroupsOption> o) {
+    options.addAll(o);
+    return this;
+  }
+
+  public GroupInfo format(GroupResource rsrc) throws OrmException {
+    return createGroupInfo(rsrc.getGroup(), rsrc::getControl);
+  }
+
+  public GroupInfo format(GroupDescription.Basic group) throws OrmException {
+    return createGroupInfo(group, Suppliers.memoize(() -> groupControlFactory.controlFor(group)));
+  }
+
+  private GroupInfo createGroupInfo(
+      GroupDescription.Basic group, Supplier<GroupControl> groupControlSupplier)
+      throws OrmException {
+    GroupInfo info = createBasicGroupInfo(group);
+
+    if (group instanceof GroupDescription.Internal) {
+      addInternalDetails(info, (GroupDescription.Internal) group, groupControlSupplier);
+    }
+
+    return info;
+  }
+
+  private static GroupInfo createBasicGroupInfo(GroupDescription.Basic group) {
+    GroupInfo info = new GroupInfo();
+    info.id = Url.encode(group.getGroupUUID().get());
+    info.name = Strings.emptyToNull(group.getName());
+    info.url = Strings.emptyToNull(group.getUrl());
+    info.options = createOptions(group);
+    return info;
+  }
+
+  private void addInternalDetails(
+      GroupInfo info,
+      GroupDescription.Internal internalGroup,
+      Supplier<GroupControl> groupControlSupplier)
+      throws OrmException {
+    info.description = Strings.emptyToNull(internalGroup.getDescription());
+    info.groupId = internalGroup.getId().get();
+
+    AccountGroup.UUID ownerGroupUUID = internalGroup.getOwnerGroupUUID();
+    if (ownerGroupUUID != null) {
+      info.ownerId = Url.encode(ownerGroupUUID.get());
+      GroupDescription.Basic o = groupBackend.get(ownerGroupUUID);
+      if (o != null) {
+        info.owner = o.getName();
+      }
+    }
+
+    info.createdOn = internalGroup.getCreatedOn();
+
+    if (options.contains(MEMBERS)) {
+      info.members = listMembers.get().getDirectMembers(internalGroup, groupControlSupplier.get());
+    }
+
+    if (options.contains(INCLUDES)) {
+      info.includes =
+          listSubgroups.get().getDirectSubgroups(internalGroup, groupControlSupplier.get());
+    }
+  }
+}