forked from assertj/assertj
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathMaps.java
More file actions
116 lines (105 loc) · 3.41 KB
/
Maps.java
File metadata and controls
116 lines (105 loc) · 3.41 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
/**
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* Copyright 2012-2014 the original author or authors.
*/
package org.assertj.core.util;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.assertj.core.presentation.Representation;
import org.assertj.core.presentation.StandardRepresentation;
/**
* Utility methods related to maps.
*
* @author Yvonne Wang
* @author Alex Ruiz
*/
public class Maps {
/**
* Returns a <em>mutable</em> {@code HashMap} that is empty.
*
* @return the created {@code HashMap}.
*/
public static <K, V> Map<K, V> newHashMap() {
return new HashMap<>();
}
/**
* Returns a <em>mutable</em> {@code ConcurrentMap} that is empty.
*
* @return the created {@code ConcurrentMap}.
*/
public static <K, V> ConcurrentMap<K, V> newConcurrentHashMap() {
return new ConcurrentHashMap<>();
}
/**
* Returns a <em>mutable</em> {@code WeakHashMap} that is empty.
*
* @return the created {@code WeakHashMap}.
*/
public static <K, V> WeakHashMap<K, V> newWeakHashMap() {
return new WeakHashMap<>();
}
/**
* Indicates whether the given {@code Map} is {@code null} or empty.
*
* @param map the map to check.
* @return {@code true} if the given {@code Map} is {@code null} or empty, otherwise {@code false}.
*/
public static boolean isNullOrEmpty(Map<?, ?> map) {
return map == null || map.isEmpty();
}
/**
* Returns the {@code String} {@link org.assertj.core.presentation.StandardRepresentation standard representation} of
* the given map, or {@code null} if the given map is {@code null}.
*
* @param map the map to format.
* @return the {@code String} representation of the given map.
*/
public static String format(Map<?, ?> map) {
return format(new StandardRepresentation(), map);
}
/**
* Returns the {@code String} representation of the given map, or {@code null} if the given map is {@code null}.
*
* @param map the map to format.
* @return the {@code String} representation of the given map.
*/
public static String format(Representation p, Map<?, ?> map) {
if (map == null) {
return null;
}
Iterator<?> i = map.entrySet().iterator();
if (!i.hasNext()) {
return "{}";
}
StringBuilder buffer = new StringBuilder();
buffer.append("{");
for (;;) {
Entry<?, ?> e = (Entry<?, ?>) i.next();
buffer.append(format(map, e.getKey(), p));
buffer.append('=');
buffer.append(format(map, e.getValue(), p));
if (!i.hasNext()) {
return buffer.append("}").toString();
}
buffer.append(", ");
}
}
private static Object format(Map<?, ?> map, Object o, Representation p) {
return o == map ? "(this Map)" : p.toStringOf(o);
}
private Maps() {
}
}