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.role.impl;
27
28 import javax.annotation.Nonnull;
29 import javax.annotation.concurrent.Immutable;
30 import java.util.Collections;
31 import java.util.HashMap;
32 import java.util.Map;
33 import java.util.Optional;
34 import java.util.Set;
35 import java.util.concurrent.CopyOnWriteArraySet;
36 import it.tidalwave.role.Aggregate;
37 import lombok.ToString;
38
39 /***************************************************************************************************************************************************************
40 *
41 * A map-based implementation of {@link Aggregate}.
42 * This is no more a public class; use {@link Aggregate#of(String, Object)} instead.
43 * @stereotype Role
44 *
45 * @param <T> the type of the aggregate
46 *
47 * @author Fabrizio Giudici
48 *
49 **************************************************************************************************************************************************************/
50 @Immutable @ToString
51 public class MapAggregate<T> implements Aggregate<T>
52 {
53 private final Map<String, T> mapByName;
54
55 /***********************************************************************************************************************************************************
56 **********************************************************************************************************************************************************/
57 public MapAggregate()
58 {
59 this.mapByName = Collections.emptyMap();
60 }
61
62 /***********************************************************************************************************************************************************
63 **********************************************************************************************************************************************************/
64 public MapAggregate (@Nonnull final Map<String, T> mapByName)
65 {
66 this.mapByName = Map.copyOf(mapByName);
67 }
68
69 /***********************************************************************************************************************************************************
70 * {@inheritDoc}
71 **********************************************************************************************************************************************************/
72 @Override @Nonnull
73 public Optional<T> getByName (@Nonnull final String name)
74 {
75 return Optional.ofNullable(mapByName.get(name));
76 }
77
78 /***********************************************************************************************************************************************************
79 * {@inheritDoc}
80 **********************************************************************************************************************************************************/
81 @Override @Nonnull
82 public Set<String> getNames()
83 {
84 return new CopyOnWriteArraySet<>(mapByName.keySet());
85 }
86
87 /***********************************************************************************************************************************************************
88 * {@inheritDoc}
89 **********************************************************************************************************************************************************/
90 @Override @Nonnull
91 public Aggregate<T> with (@Nonnull final String name, @Nonnull final T object)
92 {
93 final Map<String, T> clone = new HashMap<>(mapByName);
94 clone.put(name, object);
95 return new MapAggregate<>(clone);
96 }
97 }