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.spi;
27
28 import javax.annotation.Nonnull;
29 import java.util.Collections;
30 import java.util.List;
31 import java.util.Optional;
32 import java.util.stream.Stream;
33 import it.tidalwave.util.Finder;
34 import it.tidalwave.util.Id;
35 import lombok.RequiredArgsConstructor;
36 import static java.util.Collections.emptyList;
37
38 /***************************************************************************************************************************************************************
39 *
40 * A support class for implementing a {@link Finder} that provides filtering by id.
41 *
42 * @param <T> the product abstract type
43 * @param <I> the product concrete type
44 * @param <F> the {@code Finder} type
45 * @since 3.2-ALPHA-15
46 *
47 * @author Fabrizio Giudici
48 * @it.tidalwave.javadoc.experimental
49 *
50 **************************************************************************************************************************************************************/
51 @RequiredArgsConstructor
52 public class FinderWithIdSupport<T, I extends T, F extends ExtendedFinderSupport<T, F>>
53 extends HierarchicFinderSupport<T, F> implements FinderWithId<T, F>
54 {
55 private static final long serialVersionUID = 2L;
56
57 @Nonnull
58 /* package */ final Optional<Id> id;
59
60 public FinderWithIdSupport()
61 {
62 id = Optional.empty();
63 }
64
65 public FinderWithIdSupport (@Nonnull final FinderWithIdSupport<T, I, F> other, @Nonnull final Object override)
66 {
67 super(other, override);
68 final FinderWithIdSupport<T, I, F> source = getSource(FinderWithIdSupport.class, other, override);
69 this.id = source.id;
70 }
71
72 @Override @Nonnull
73 public F withId (@Nonnull final Id id)
74 {
75 return clonedWith(new FinderWithIdSupport<>(Optional.of(id)));
76 }
77
78 @Override @Nonnull
79 protected List<T> computeResults()
80 {
81 return id.map(id -> findById(id).map(Collections::singletonList).orElse(emptyList())).orElse(findAll());
82 }
83
84 @Nonnull
85 protected Optional<T> findById (@Nonnull final Id id)
86 {
87 throw new UnsupportedOperationException("Must be overridden");
88 }
89
90 @Nonnull
91 protected List<T> findAll()
92 {
93 throw new UnsupportedOperationException("Must be overridden");
94 }
95
96 @Nonnull
97 protected Stream<I> streamImpl()
98 {
99 return (Stream<I>)stream();
100 }
101 }
102