oxedyne/fe2o3 — fe2o3_text/tests/detect

1.2 KiB, 1 run

created by r1870400018:11986, which is this file's identity for as long as the history lasts, whatever it is later renamed to

1	import java.util.HashMap;
2	import java.util.Map;
3	import java.util.Optional;
4
5	public class Registry<T> {
6
7	private final Map<String, T> entries = new HashMap<>();
8	private final String name;
9
10	public Registry(String name) {
11	this.name = name;
12	}
13
14	public void register(String key, T value) {
15	if (entries.containsKey(key)) {
16	throw new IllegalArgumentException("duplicate key: " + key);
17	}
18	entries.put(key, value);
19	}
20
21	public Optional<T> lookup(String key) {
22	return Optional.ofNullable(entries.get(key));
23	}
24
25	public boolean contains(String key) {
26	return entries.containsKey(key);
27	}
28
29	public int size() {
30	return entries.size();
31	}
32
33	@Override
34	public String toString() {
35	return String.format("Registry[%s, %d entries]", name, entries.size());
36	}
37
38	public static void main(String[] args) {
39	Registry<String> reg = new Registry<>("colours");
40	reg.register("red", "#ff0000");
41	reg.register("green", "#00ff00");
42	reg.register("blue", "#0000ff");
43
44	System.out.println(reg);
45
46	reg.lookup("red").ifPresent(v ->
47	System.out.println("red = " + v)
48	);
49	}
50	}