OfflineWebPreferences.java
4.74 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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
package com.mumfrey.webprefs;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mumfrey.liteloader.core.LiteLoader;
import com.mumfrey.webprefs.exceptions.ReadOnlyPreferencesException;
/**
* Surrogate preferences returned for a local offline player, allows offline
* players to use the webpreferences system with preferences just being stored
* locally.
*/
class OfflineWebPreferences extends DummyOfflineWebPreferences
{
/**
* Gson instance for serialisation/deserialisation to local JSON file
*/
private static final Gson gson = new GsonBuilder().setPrettyPrinting().create();
/**
* Maximum commit-to-disk rate in ticks
*/
private static final int COMMIT_RATE = 20 * 3;
/**
* JSON file
*/
private final File store;
/**
* Local KV store
*/
final Map<String, String> prefs;
/**
* Tick number for write throttling
*/
private int tickNumber;
/**
* Flag indicating serialisation to disk is required
*/
private boolean isDirty;
OfflineWebPreferences(UUID uuid, boolean isPrivate, boolean isReadOnly)
{
this(uuid.toString(), isPrivate, isReadOnly);
}
OfflineWebPreferences(String uuid, boolean isPrivate, boolean isReadOnly)
{
super(uuid, isPrivate, isReadOnly);
this.store = new File(LiteLoader.getCommonConfigFolder(), String.format("%s.%sprefs.json", uuid, isPrivate ? "private" : ""));
this.prefs = this.loadValues();
}
@SuppressWarnings("unchecked")
private Map<String, String> loadValues()
{
if (this.store.isFile())
{
FileReader reader = null;
try
{
reader = new FileReader(this.store);
return OfflineWebPreferences.gson.fromJson(reader, Map.class);
}
catch (IOException ex) {}
finally
{
try
{
if (reader != null) reader.close();
}
catch (IOException ex) {}
}
}
return new HashMap<String, String>();
}
private void saveValues()
{
FileWriter writer = null;
try
{
writer = new FileWriter(this.store);
OfflineWebPreferences.gson.toJson(this.prefs, writer);
}
catch (IOException ex) {}
finally
{
try
{
if (writer != null) writer.close();
}
catch (IOException ex) {}
}
}
@Override
void onTick()
{
if (this.tickNumber++ > OfflineWebPreferences.COMMIT_RATE && this.isDirty)
{
this.isDirty = false;
this.tickNumber = 0;
this.saveValues();
}
}
@Override
public void request(String key)
{
WebPreferences.validateKey(key);
if (!this.prefs.containsKey(key))
{
this.prefs.put(key, "");
}
}
/* (non-Javadoc)
* @see com.mumfrey.webprefs.interfaces.IWebPreferences#commit(boolean)
*/
@Override
public void commit(boolean force)
{
this.isDirty = true;
}
/* (non-Javadoc)
* @see com.mumfrey.webprefs.interfaces.IWebPreferences
* #has(java.lang.String)
*/
@Override
public boolean has(String key)
{
WebPreferences.validateKey(key);
return this.prefs.containsKey(key);
}
/* (non-Javadoc)
* @see com.mumfrey.webprefs.interfaces.IWebPreferences
* #get(java.lang.String)
*/
@Override
public String get(String key)
{
return this.get(key, "");
}
/* (non-Javadoc)
* @see com.mumfrey.webprefs.interfaces.IWebPreferences
* #get(java.lang.String, java.lang.String)
*/
@Override
public String get(String key, String defaultValue)
{
WebPreferences.validateKey(key);
String value = this.prefs.get(key);
return value != null ? value : defaultValue;
}
/* (non-Javadoc)
* @see com.mumfrey.webprefs.interfaces.IWebPreferences
* #set(java.lang.String, java.lang.String)
*/
@Override
public void set(String key, String value)
{
if (this.isReadOnly())
{
throw new ReadOnlyPreferencesException("Preference collection for " + this.uuid + " is read-only");
}
WebPreferences.validateKV(key, value);
this.prefs.put(key, value);
this.isDirty = true;
}
}