ProviderFinder.java

  1. /*
  2.  * *************************************************************************************************************************************************************
  3.  *
  4.  * TheseFoolishThings: Miscellaneous utilities
  5.  * http://tidalwave.it/projects/thesefoolishthings
  6.  *
  7.  * Copyright (C) 2009 - 2024 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 the License.
  12.  * 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 an "AS IS" BASIS, WITHOUT WARRANTIES OR
  17.  * CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and limitations under the License.
  18.  *
  19.  * *************************************************************************************************************************************************************
  20.  *
  21.  * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
  22.  * git clone https://github.com/tidalwave-it/thesefoolishthings-src
  23.  *
  24.  * *************************************************************************************************************************************************************
  25.  */
  26. package it.tidalwave.util.impl.finder;

  27. import javax.annotation.Nonnull;
  28. import javax.annotation.concurrent.Immutable;
  29. import java.util.Collection;
  30. import java.util.List;
  31. import java.util.concurrent.CopyOnWriteArrayList;
  32. import java.util.function.BiFunction;
  33. import java.util.function.Supplier;
  34. import it.tidalwave.util.Finder;
  35. import it.tidalwave.util.spi.SimpleFinderSupport;

  36. /***************************************************************************************************************************************************************
  37.  *
  38.  * A {@link Finder} which retrieve results from a {@link Supplier}.
  39.  *
  40.  * @author  Fabrizio Giudici
  41.  *
  42.  **************************************************************************************************************************************************************/
  43. @Immutable
  44. public class ProviderFinder<T> extends SimpleFinderSupport<T>
  45.   {
  46.     private static final long serialVersionUID = 1344191036948400804L;

  47.     @Nonnull
  48.     private final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier;

  49.     @SuppressWarnings("BoundedWildcard")
  50.     public ProviderFinder (@Nonnull final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier)
  51.       {
  52.         this.supplier = supplier;
  53.       }

  54.     public ProviderFinder (@Nonnull final ProviderFinder<T> other, @Nonnull final Object override)
  55.       {
  56.         super(other, override);
  57.         final ProviderFinder<T> source = getSource(ProviderFinder.class, other, override);
  58.         this.supplier = source.supplier;
  59.       }

  60.     @Override @Nonnull
  61.     protected List<T> computeNeededResults()
  62.       {
  63.         return new CopyOnWriteArrayList<>(supplier.apply(firstResult, maxResults));
  64.       }
  65.   }