-
Notifications
You must be signed in to change notification settings - Fork 0
/
FileBag.cs
122 lines (109 loc) · 3.81 KB
/
FileBag.cs
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
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace Teto {
/// <summary>
/// A bag-sorted collection of files.
/// </summary>
public class FileBag {
/// <summary>
/// The directory path of this bag.
/// </summary>
public string Path { get; private set; }
/// <summary>
/// The files queued for use.
/// </summary>
private List<string> futureBag = new List<string>();
/// <summary>
/// The files that have been used already.
/// </summary>
private List<string> pastBag = new List<string>();
/// <summary>
/// The instance's randomizer.
/// </summary>
private Random rng = new Random();
/// <summary>
/// Gets the count of items remaining in this bag.
/// </summary>
public int Count {
get {
return futureBag.Count;
}
}
/// <summary>
/// Gets the total count of items in the bag.
/// </summary>
public int TotalCount {
get {
return futureBag.Count + pastBag.Count;
}
}
/// <summary>
/// Construct a file bag.
/// </summary>
/// <param name="path">The directory path of the bag to be created.</param>
public FileBag(string path) {
Path = path;
Update(true);
}
/// <summary>
/// Shuffles the bag in place.
/// </summary>
public void Shuffle() {
for (var i = 0; i < futureBag.Count - 1; i++) {
int j = rng.Next(i, futureBag.Count);
string t = futureBag[i];
futureBag[i] = futureBag[j];
futureBag[j] = t;
}
}
/// <summary>
/// Reloads the bag's file listing.
/// </summary>
/// <param name="reset">Whether to forget progress (will reshuffle)</param>
public void Update(bool reset) {
string[] files = Directory.GetFiles(Path);
if (reset) {
futureBag = new List<string>();
pastBag = new List<string>();
futureBag.AddRange(files);
Shuffle();
} else {
List<string> filesThatShouldExist = new List<string>();
filesThatShouldExist.AddRange(futureBag);
filesThatShouldExist.AddRange(pastBag);
foreach (string file in files) {
if (filesThatShouldExist.Contains(file)) {
// file has not changed
filesThatShouldExist.Remove(file);
} else {
// new file
futureBag.Insert(rng.Next(0, futureBag.Count), file);
The.Low($"Added new file { System.IO.Path.GetFileName(file) } to bag (now { futureBag.Count } files).");
}
}
foreach (string file in filesThatShouldExist) {
// file was deleted
futureBag.Remove(file);
pastBag.Remove(file);
The.Low($"Removed deleted file { System.IO.Path.GetFileName(file) } from bag (now { futureBag.Count } files).");
}
}
}
/// <summary>
/// Grab a file out of this bag.
/// </summary>
/// <returns>The file grabbed.</returns>
public string Take() {
Update(futureBag.Count == 0);
if (futureBag.Count == 0) {
throw new IOException("The bag is empty.");
}
string taken = futureBag.First();
futureBag.RemoveAt(0);
pastBag.Add(taken);
return taken;
}
}
}