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
|
package design.persistence;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.core.StreamReadFeature;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
import design.model.Course;
import design.model.Golfer;
import design.model.League;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
public class JSONLeagueDatabase implements LeagueDatabase {
private static JSONLeagueDatabase INSTANCE;
public static JSONLeagueDatabase instance() {
if (INSTANCE == null) {
INSTANCE = new JSONLeagueDatabase("data/leaguedb.json");
}
return INSTANCE;
}
private final Map<Integer, League> cache;
private final ObjectMapper mapper;
private final File file;
private int nextLeagueID;
public JSONLeagueDatabase(String filename) {
this.file = new File(filename);
this.cache = new HashMap<>();
this.mapper = JsonMapper.builder().enable(StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION).build();
SimpleModule module = new SimpleModule();
module.addDeserializer(Course.class, new Serializers.CourseIdDeserializer());
module.addSerializer(Course.class, new Serializers.CourseIdSerializer());
module.addDeserializer(Golfer.class, new Serializers.GolferUsernameDeserializer());
module.addSerializer(Golfer.class, new Serializers.GolferUsernameSerializer());
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.registerModule(module);
mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
mapper.registerModule(new ParameterNamesModule(JsonCreator.Mode.PROPERTIES));
mapper.registerModule(new JavaTimeModule());
try {
load();
} catch (IOException ex) {
throw new RuntimeException(ex);
}
this.nextLeagueID = cache.values().stream().mapToInt(League::getId).max().orElse(0) + 1;
}
private void load() throws IOException {
League[] data = mapper.readValue(file, League[].class);
cache.clear();
Arrays.stream(data).forEach(i -> cache.put(i.getId(), i));
}
private void save() throws IOException {
League[] data = cache.values().toArray(League[]::new);
mapper.writer(new Serializers.CustomPrettyPrinter()).writeValue(file, data);
}
@Override
public League getLeague(int id) {
return cache.get(id);
}
@Override
public League[] getLeagues() {
return cache.values().toArray(League[]::new);
}
@Override
public void addLeague(League league) throws IOException {
league.setId(nextLeagueID++);
cache.putIfAbsent(league.getId(), league);
save();
}
@Override
public void removeLeague(League league) throws IOException {
cache.remove(league.getId());
save();
}
@Override
public void updateLeague(League league) throws IOException {
cache.put(league.getId(), league);
save();
}
}
|
