Line data    Source code

       1             : // Copyright (C) 2010 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.query.change;
      16             : 
      17             : import static com.google.common.collect.ImmutableList.toImmutableList;
      18             : 
      19             : import com.google.common.collect.ImmutableList;
      20             : import com.google.gerrit.entities.Change;
      21             : import com.google.gerrit.index.query.FieldBundle;
      22             : import com.google.gerrit.index.query.LazyResultSet;
      23             : import com.google.gerrit.index.query.OrPredicate;
      24             : import com.google.gerrit.index.query.Predicate;
      25             : import com.google.gerrit.index.query.ResultSet;
      26             : import java.util.Collection;
      27             : import java.util.HashSet;
      28             : import java.util.List;
      29             : import java.util.Optional;
      30             : import java.util.Set;
      31             : 
      32             : public class OrSource extends OrPredicate<ChangeData> implements ChangeDataSource {
      33           1 :   private int cardinality = -1;
      34             : 
      35             :   public OrSource(Collection<? extends Predicate<ChangeData>> that) {
      36           1 :     super(that);
      37           1 :     Optional<Predicate<ChangeData>> nonChangeDataSource =
      38           1 :         getChildren().stream().filter(p -> !(p instanceof ChangeDataSource)).findAny();
      39           1 :     if (nonChangeDataSource.isPresent()) {
      40           1 :       throw new IllegalArgumentException("No ChangeDataSource: " + nonChangeDataSource.get());
      41             :     }
      42           1 :   }
      43             : 
      44             :   @Override
      45             :   public ResultSet<ChangeData> read() {
      46             :     // ResultSets are lazy. Calling #read here first and then dealing with ResultSets only when
      47             :     // requested allows the index to run asynchronous queries.
      48           1 :     List<ResultSet<ChangeData>> results =
      49           1 :         getChildren().stream().map(p -> ((ChangeDataSource) p).read()).collect(toImmutableList());
      50           1 :     return new LazyResultSet<>(
      51             :         () -> {
      52           1 :           ImmutableList.Builder<ChangeData> r = ImmutableList.builder();
      53           1 :           Set<Change.Id> have = new HashSet<>();
      54           1 :           for (ResultSet<ChangeData> resultSet : results) {
      55           0 :             for (ChangeData result : resultSet) {
      56           0 :               if (have.add(result.getId())) {
      57           0 :                 r.add(result);
      58             :               }
      59           0 :             }
      60           0 :           }
      61           0 :           return r.build();
      62             :         });
      63             :   }
      64             : 
      65             :   @Override
      66             :   public ResultSet<FieldBundle> readRaw() {
      67           0 :     throw new UnsupportedOperationException("not implemented");
      68             :   }
      69             : 
      70             :   @Override
      71             :   public boolean hasChange() {
      72           0 :     for (Predicate<ChangeData> p : getChildren()) {
      73           0 :       if (!(p instanceof ChangeDataSource) || !((ChangeDataSource) p).hasChange()) {
      74           0 :         return false;
      75             :       }
      76           0 :     }
      77           0 :     return true;
      78             :   }
      79             : 
      80             :   @Override
      81             :   public int getCardinality() {
      82           0 :     if (cardinality < 0) {
      83           0 :       cardinality = 0;
      84           0 :       for (Predicate<ChangeData> p : getChildren()) {
      85           0 :         if (p instanceof ChangeDataSource) {
      86           0 :           cardinality += ((ChangeDataSource) p).getCardinality();
      87             :         }
      88           0 :       }
      89             :     }
      90           0 :     return cardinality;
      91             :   }
      92             : }