1 /*
2 * *************************************************************************************************************************************************************
3 *
4 * TheseFoolishThings: Miscellaneous utilities
5 * http://tidalwave.it/projects/thesefoolishthings
6 *
7 * Copyright (C) 2009 - 2025 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
28 import javax.annotation.Nonnull;
29 import javax.annotation.concurrent.Immutable;
30 import java.util.Collection;
31 import java.util.List;
32 import java.util.concurrent.CopyOnWriteArrayList;
33 import java.util.function.BiFunction;
34 import java.util.function.Supplier;
35 import it.tidalwave.util.Finder;
36 import it.tidalwave.util.spi.SimpleFinderSupport;
37
38 /***************************************************************************************************************************************************************
39 *
40 * A {@link Finder} which retrieve results from a {@link Supplier}.
41 *
42 * @author Fabrizio Giudici
43 *
44 **************************************************************************************************************************************************************/
45 @Immutable
46 public class ProviderFinder<T> extends SimpleFinderSupport<T>
47 {
48 private static final long serialVersionUID = 1344191036948400804L;
49
50 @Nonnull
51 private final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier;
52
53 @SuppressWarnings("BoundedWildcard")
54 public ProviderFinder (@Nonnull final BiFunction<Integer, Integer, ? extends Collection<? extends T>> supplier)
55 {
56 this.supplier = supplier;
57 }
58
59 public ProviderFinder (@Nonnull final ProviderFinder<T> other, @Nonnull final Object override)
60 {
61 super(other, override);
62 final ProviderFinder<T> source = getSource(ProviderFinder.class, other, override);
63 this.supplier = source.supplier;
64 }
65
66 @Override @Nonnull
67 protected List<T> computeNeededResults()
68 {
69 return new CopyOnWriteArrayList<>(supplier.apply(firstResult, maxResults));
70 }
71 }