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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;
27:
28: import javax.annotation.Nonnull;
29: import java.util.Collections;
30: import java.util.Map;
31: import java.util.Optional;
32: import java.util.Set;
33: import it.tidalwave.role.impl.MapAggregate;
34:
35: /***************************************************************************************************************************************************************
36: *
37: * The role of an aggregate object, that is an object which contains other named objects.
38: *
39: * @stereotype Role
40: *
41: * @author Fabrizio Giudici
42: *
43: **************************************************************************************************************************************************************/
44: @FunctionalInterface
45: public interface Aggregate<T>
46: {
47: public static final Class<Aggregate> _Aggregate_ = Aggregate.class;
48:
49: /***********************************************************************************************************************************************************
50: * Returns an object given its name.
51: * @param name the name
52: * @return the object
53: **********************************************************************************************************************************************************/
54: @Nonnull
55: public Optional<T> getByName (@Nonnull String name);
56:
57: /***********************************************************************************************************************************************************
58: * Returns the names of contained objects.
59: * @return the names of the objects
60: * @since 3.1-ALPHA-8
61: **********************************************************************************************************************************************************/
62: @Nonnull
63: public default Set<String> getNames()
64: {
65: return Collections.emptySet();
66: }
67:
68: /***********************************************************************************************************************************************************
69: * Returns a new instance with the specified (name, value) pairs.
70: * @param <T> the static type of the value
71: * @param mapByName the map containing the pairs
72: * @return the new instance
73: * @since 3.2-ALPHA-1
74: **********************************************************************************************************************************************************/
75: @Nonnull
76: public static <T> Aggregate<T> of (@Nonnull final Map<String, T> mapByName)
77: {
78: return new MapAggregate<>(mapByName);
79: }
80:
81: /***********************************************************************************************************************************************************
82: * Returns a new empty instance that will be populated by means of {@link #with(String, Object)}.
83: * @param <T> the static type of the aggregate
84: * @return the new instance
85: * @since 3.2-ALPHA-2
86: **********************************************************************************************************************************************************/
87: @Nonnull
88: public static <T> Aggregate<T> newInstance()
89: {
90: return new MapAggregate<>();
91: }
92:
93: /***********************************************************************************************************************************************************
94: * Returns a new instance with the specified (name, value) pair.
95: * @param <T> the static type of the aggregate
96: * @param name the name in the pair
97: * @param value the value in the pair
98: * @return the new instance
99: * @since 3.2-ALPHA-1
100: **********************************************************************************************************************************************************/
101: @Nonnull
102: public static <T> Aggregate<T> of (@Nonnull final String name, @Nonnull final T value)
103: {
104: return new MapAggregate<T>().with(name, value);
105: }
106:
107: /***********************************************************************************************************************************************************
108: * Returns a new instance with the specified (name, value) pair.
109: * @param name the name in the pair
110: * @param value the value in the pair
111: * @return the new instance
112: * @since 3.2-ALPHA-1
113: **********************************************************************************************************************************************************/
114: @Nonnull
115: public default Aggregate<T> with (@Nonnull final String name, @Nonnull final T value)
116: {
117: return new MapAggregate<T>().with(name, value);
118: }
119: }