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// Copyright (C) 2010 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.query.change;
import static com.google.common.base.Preconditions.checkState;
import static com.google.gerrit.server.query.change.ChangeQueryBuilder.FIELD_LIMIT;
import com.google.gerrit.extensions.common.PluginDefinedInfo;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.index.IndexConfig;
import com.google.gerrit.index.QueryOptions;
import com.google.gerrit.index.query.IndexPredicate;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.index.query.QueryProcessor;
import com.google.gerrit.metrics.MetricMaker;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.account.AccountLimits;
import com.google.gerrit.server.index.change.ChangeIndexCollection;
import com.google.gerrit.server.index.change.ChangeIndexRewriter;
import com.google.gerrit.server.index.change.ChangeSchemaDefinitions;
import com.google.gerrit.server.index.change.IndexedChangeQuery;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* Query processor for the change index.
*
* <p>Instances are one-time-use. Other singleton classes should inject a Provider rather than
* holding on to a single instance.
*/
public class ChangeQueryProcessor extends QueryProcessor<ChangeData>
implements PluginDefinedAttributesFactory {
/**
* Register a ChangeAttributeFactory in a config Module like this:
*
* <p>bind(ChangeAttributeFactory.class) .annotatedWith(Exports.named("export-name"))
* .to(YourClass.class);
*/
public interface ChangeAttributeFactory {
PluginDefinedInfo create(ChangeData a, ChangeQueryProcessor qp, String plugin);
}
private final Provider<ReviewDb> db;
private final Provider<CurrentUser> userProvider;
private final ChangeNotes.Factory notesFactory;
private final DynamicMap<ChangeAttributeFactory> attributeFactories;
private final PermissionBackend permissionBackend;
static {
// It is assumed that basic rewrites do not touch visibleto predicates.
checkState(
!ChangeIsVisibleToPredicate.class.isAssignableFrom(IndexPredicate.class),
"ChangeQueryProcessor assumes visibleto is not used by the index rewriter.");
}
@Inject
ChangeQueryProcessor(
Provider<CurrentUser> userProvider,
AccountLimits.Factory limitsFactory,
MetricMaker metricMaker,
IndexConfig indexConfig,
ChangeIndexCollection indexes,
ChangeIndexRewriter rewriter,
Provider<ReviewDb> db,
ChangeNotes.Factory notesFactory,
DynamicMap<ChangeAttributeFactory> attributeFactories,
PermissionBackend permissionBackend) {
super(
metricMaker,
ChangeSchemaDefinitions.INSTANCE,
indexConfig,
indexes,
rewriter,
FIELD_LIMIT,
() -> limitsFactory.create(userProvider.get()).getQueryLimit());
this.db = db;
this.userProvider = userProvider;
this.notesFactory = notesFactory;
this.attributeFactories = attributeFactories;
this.permissionBackend = permissionBackend;
}
@Override
public ChangeQueryProcessor enforceVisibility(boolean enforce) {
super.enforceVisibility(enforce);
return this;
}
@Override
protected QueryOptions createOptions(
IndexConfig indexConfig, int start, int limit, Set<String> requestedFields) {
return IndexedChangeQuery.createOptions(indexConfig, start, limit, requestedFields);
}
@Override
public List<PluginDefinedInfo> create(ChangeData cd) {
List<PluginDefinedInfo> plugins = new ArrayList<>(attributeFactories.plugins().size());
for (String plugin : attributeFactories.plugins()) {
for (Provider<ChangeAttributeFactory> provider :
attributeFactories.byPlugin(plugin).values()) {
PluginDefinedInfo pda = null;
try {
pda = provider.get().create(cd, this, plugin);
} catch (RuntimeException e) {
/* Eat runtime exceptions so that queries don't fail. */
}
if (pda != null) {
pda.name = plugin;
plugins.add(pda);
}
}
}
if (plugins.isEmpty()) {
plugins = null;
}
return plugins;
}
@Override
protected Predicate<ChangeData> enforceVisibility(Predicate<ChangeData> pred) {
return new AndChangeSource(
pred,
new ChangeIsVisibleToPredicate(db, notesFactory, userProvider.get(), permissionBackend),
start);
}
}
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