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
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.Supplier;
34 import it.tidalwave.util.Finder;
35 import it.tidalwave.util.spi.SimpleFinderSupport;
36
37 /***************************************************************************************************************************************************************
38 *
39 * A {@link Finder} which retrieve results from a {@link Supplier}.
40 *
41 * @author Fabrizio Giudici
42 *
43 **************************************************************************************************************************************************************/
44 @Immutable
45 public class SupplierFinder<T> extends SimpleFinderSupport<T>
46 {
47 private static final long serialVersionUID = 1344191036948400804L;
48
49 @Nonnull
50 private final Supplier<? extends Collection<? extends T>> supplier;
51
52 public SupplierFinder (@Nonnull final Supplier<? extends Collection<? extends T>> supplier)
53 {
54 this.supplier = supplier;
55 }
56
57 public SupplierFinder (@Nonnull final SupplierFinder<T> other, @Nonnull final Object override)
58 {
59 super(other, override);
60 final SupplierFinder<T> source = getSource(SupplierFinder.class, other, override);
61 this.supplier = source.supplier;
62 }
63
64 @Override @Nonnull
65 protected List<T> computeResults() // FIXME: or computeNeededResults()?
66 {
67 return new CopyOnWriteArrayList<>(supplier.get());
68 }
69 }