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// Copyright (C) 2012 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.account;
import static com.google.gerrit.server.account.GroupBackends.GROUP_REF_NAME_COMPARATOR;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import com.google.gerrit.common.data.GroupDescription;
import com.google.gerrit.common.data.GroupReference;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.project.ProjectControl;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Universal implementation of the GroupBackend that works with the injected
* set of GroupBackends.
*/
@Singleton
public class UniversalGroupBackend implements GroupBackend {
private static final Logger log =
LoggerFactory.getLogger(UniversalGroupBackend.class);
private final DynamicSet<GroupBackend> backends;
@Inject
UniversalGroupBackend(DynamicSet<GroupBackend> backends) {
this.backends = backends;
}
@Nullable
private GroupBackend backend(AccountGroup.UUID uuid) {
if (uuid != null) {
for (GroupBackend g : backends) {
if (g.handles(uuid)) {
return g;
}
}
}
return null;
}
@Override
public boolean handles(AccountGroup.UUID uuid) {
return backend(uuid) != null;
}
@Override
public GroupDescription.Basic get(AccountGroup.UUID uuid) {
GroupBackend b = backend(uuid);
if (b == null) {
log.warn("Unknown GroupBackend for UUID: " + uuid);
return null;
}
return b.get(uuid);
}
@Override
public Collection<GroupReference> suggest(String name, ProjectControl project) {
Set<GroupReference> groups = Sets.newTreeSet(GROUP_REF_NAME_COMPARATOR);
for (GroupBackend g : backends) {
groups.addAll(g.suggest(name, project));
}
return groups;
}
@Override
public GroupMembership membershipsOf(IdentifiedUser user) {
return new UniversalGroupMembership(user);
}
private class UniversalGroupMembership implements GroupMembership {
private final Map<GroupBackend, GroupMembership> memberships;
private UniversalGroupMembership(IdentifiedUser user) {
ImmutableMap.Builder<GroupBackend, GroupMembership> builder =
ImmutableMap.builder();
for (GroupBackend g : backends) {
builder.put(g, g.membershipsOf(user));
}
this.memberships = builder.build();
}
@Nullable
private GroupMembership membership(AccountGroup.UUID uuid) {
if (uuid != null) {
for (Map.Entry<GroupBackend, GroupMembership> m : memberships.entrySet()) {
if (m.getKey().handles(uuid)) {
return m.getValue();
}
}
}
return null;
}
@Override
public boolean contains(AccountGroup.UUID uuid) {
GroupMembership m = membership(uuid);
if (m == null) {
log.warn("Unknown GroupMembership for UUID: " + uuid);
return false;
}
return m.contains(uuid);
}
@Override
public boolean containsAnyOf(Iterable<AccountGroup.UUID> uuids) {
Multimap<GroupMembership, AccountGroup.UUID> lookups =
ArrayListMultimap.create();
for (AccountGroup.UUID uuid : uuids) {
GroupMembership m = membership(uuid);
if (m == null) {
log.warn("Unknown GroupMembership for UUID: " + uuid);
continue;
}
lookups.put(m, uuid);
}
for (Map.Entry<GroupMembership, Collection<AccountGroup.UUID>> entry
: lookups .asMap().entrySet()) {
GroupMembership m = entry.getKey();
Collection<AccountGroup.UUID> ids = entry.getValue();
if (ids.size() == 1) {
if (m.contains(Iterables.getOnlyElement(ids))) {
return true;
}
} else if (m.containsAnyOf(ids)) {
return true;
}
}
return false;
}
@Override
public Set<AccountGroup.UUID> intersection(Iterable<AccountGroup.UUID> uuids) {
Multimap<GroupMembership, AccountGroup.UUID> lookups =
ArrayListMultimap.create();
for (AccountGroup.UUID uuid : uuids) {
GroupMembership m = membership(uuid);
if (m == null) {
log.warn("Unknown GroupMembership for UUID: " + uuid);
continue;
}
lookups.put(m, uuid);
}
Set<AccountGroup.UUID> groups = Sets.newHashSet();
for (Map.Entry<GroupMembership, Collection<AccountGroup.UUID>> entry
: lookups.asMap().entrySet()) {
groups.addAll(entry.getKey().intersection(entry.getValue()));
}
return groups;
}
@Override
public Set<AccountGroup.UUID> getKnownGroups() {
Set<AccountGroup.UUID> groups = Sets.newHashSet();
for (GroupMembership m : memberships.values()) {
groups.addAll(m.getKnownGroups());
}
return groups;
}
}
}
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