Line data    Source code

       1             : // Copyright (C) 2022 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.index.query;
      16             : 
      17             : import java.util.Collection;
      18             : import java.util.Optional;
      19             : 
      20             : public class AndCardinalPredicate<T> extends AndPredicate<T> implements HasCardinality {
      21             :   private final int cardinality;
      22             : 
      23             :   public AndCardinalPredicate(Collection<? extends Predicate<T>> that) {
      24           7 :     super(that);
      25           7 :     Optional<Predicate<T>> atLeastOneCardinalPredicate =
      26           7 :         getChildren().stream().filter(p -> (p instanceof HasCardinality)).findAny();
      27           7 :     if (!atLeastOneCardinalPredicate.isPresent()) {
      28           1 :       throw new IllegalArgumentException("No HasCardinality Found");
      29             :     }
      30           6 :     int minCardinality = Integer.MAX_VALUE;
      31           6 :     for (Predicate<T> child : getChildren()) {
      32           6 :       if (child instanceof HasCardinality) {
      33           6 :         minCardinality = Math.min(((HasCardinality) child).getCardinality(), minCardinality);
      34             :       }
      35           6 :     }
      36           6 :     cardinality = minCardinality;
      37           6 :   }
      38             : 
      39             :   @Override
      40             :   public Predicate<T> copy(Collection<? extends Predicate<T>> children) {
      41           0 :     return new AndCardinalPredicate<>(children);
      42             :   }
      43             : 
      44             :   @Override
      45             :   public int getCardinality() {
      46           2 :     return cardinality;
      47             :   }
      48             : }