RepositoryOptimizedTrackFinder.java

  1. /*
  2.  * *********************************************************************************************************************
  3.  *
  4.  * blueMarine II: Semantic Media Centre
  5.  * http://tidalwave.it/projects/bluemarine2
  6.  *
  7.  * Copyright (C) 2015 - 2021 by Tidalwave s.a.s. (http://tidalwave.it)
  8.  *
  9.  * *********************************************************************************************************************
  10.  *
  11.  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  12.  * the License. You may obtain a copy of the License at
  13.  *
  14.  *     http://www.apache.org/licenses/LICENSE-2.0
  15.  *
  16.  * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
  17.  * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
  18.  * specific language governing permissions and limitations under the License.
  19.  *
  20.  * *********************************************************************************************************************
  21.  *
  22.  * git clone https://bitbucket.org/tidalwave/bluemarine2-src
  23.  * git clone https://github.com/tidalwave-it/bluemarine2-src
  24.  *
  25.  * *********************************************************************************************************************
  26.  */
  27. package it.tidalwave.bluemarine2.model.impl.catalog.finder;

  28. import javax.annotation.Nonnegative;
  29. import javax.annotation.Nonnull;
  30. import java.util.Optional;
  31. import org.eclipse.rdf4j.repository.Repository;
  32. import lombok.ToString;

  33. /***********************************************************************************************************************
  34.  *
  35.  * An optimised specialisation of {@link RepositoryTrackFinder} that eventually uses an optional pre-computed value for
  36.  * the track count.
  37.  *
  38.  * @stereotype  Finder
  39.  *
  40.  * @author  Fabrizio Giudici
  41.  *
  42.  **********************************************************************************************************************/
  43. @ToString
  44. public class RepositoryOptimizedTrackFinder extends RepositoryTrackFinder
  45.   {
  46.     private static final long serialVersionUID = -4361362680267527615L;

  47.     @Nonnull
  48.     private final Optional<Integer> trackCount;

  49.     public RepositoryOptimizedTrackFinder (@Nonnull final Repository repository,
  50.                                            @Nonnull final Optional<Integer> trackCount)
  51.       {
  52.         super(repository);
  53.         this.trackCount = trackCount;
  54.       }

  55.     public RepositoryOptimizedTrackFinder (@Nonnull final RepositoryOptimizedTrackFinder other,
  56.                                            @Nonnull final Object override)
  57.       {
  58.         super(other, override);
  59.         final RepositoryOptimizedTrackFinder source = getSource(RepositoryOptimizedTrackFinder.class, other, override);
  60.         this.trackCount = source.trackCount;
  61.       }

  62.     @Override @Nonnegative
  63.     public int count()
  64.       {
  65.         // in case other parameters are added, remember to check for them
  66.         return (recordId.isPresent() && makerId.isEmpty()) ? trackCount.orElseGet(super::count) : super.count();
  67.       }
  68.   }