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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.collect.ImmutableList.toImmutableList;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.entities.Change;
import com.google.gerrit.index.query.FieldBundle;
import com.google.gerrit.index.query.LazyResultSet;
import com.google.gerrit.index.query.OrPredicate;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.index.query.ResultSet;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
public class OrSource extends OrPredicate<ChangeData> implements ChangeDataSource {
private int cardinality = -1;
public OrSource(Collection<? extends Predicate<ChangeData>> that) {
super(that);
Optional<Predicate<ChangeData>> nonChangeDataSource =
getChildren().stream().filter(p -> !(p instanceof ChangeDataSource)).findAny();
if (nonChangeDataSource.isPresent()) {
throw new IllegalArgumentException("No ChangeDataSource: " + nonChangeDataSource.get());
}
}
@Override
public ResultSet<ChangeData> read() {
// ResultSets are lazy. Calling #read here first and then dealing with ResultSets only when
// requested allows the index to run asynchronous queries.
List<ResultSet<ChangeData>> results =
getChildren().stream().map(p -> ((ChangeDataSource) p).read()).collect(toImmutableList());
return new LazyResultSet<>(
() -> {
ImmutableList.Builder<ChangeData> r = ImmutableList.builder();
Set<Change.Id> have = new HashSet<>();
for (ResultSet<ChangeData> resultSet : results) {
for (ChangeData result : resultSet) {
if (have.add(result.getId())) {
r.add(result);
}
}
}
return r.build();
});
}
@Override
public ResultSet<FieldBundle> readRaw() {
throw new UnsupportedOperationException("not implemented");
}
@Override
public boolean hasChange() {
for (Predicate<ChangeData> p : getChildren()) {
if (!(p instanceof ChangeDataSource) || !((ChangeDataSource) p).hasChange()) {
return false;
}
}
return true;
}
@Override
public int getCardinality() {
if (cardinality < 0) {
cardinality = 0;
for (Predicate<ChangeData> p : getChildren()) {
if (p instanceof ChangeDataSource) {
cardinality += ((ChangeDataSource) p).getCardinality();
}
}
}
return cardinality;
}
}