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
|
/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_TAG_BUILDER_HXX
#define MPD_TAG_BUILDER_HXX
#include "TagType.h"
#include "Compiler.h"
#include <vector>
#include <stddef.h>
struct TagItem;
struct Tag;
/**
* A class that constructs #Tag objects.
*/
class TagBuilder {
/**
* The duration of the song (in seconds). A value of zero
* means that the length is unknown. If the duration is
* really between zero and one second, you should round up to
* 1.
*/
int time;
/**
* Does this file have an embedded playlist (e.g. embedded CUE
* sheet)?
*/
bool has_playlist;
/** an array of tag items */
std::vector<TagItem *> items;
public:
/**
* Create an empty tag.
*/
TagBuilder()
:time(-1), has_playlist(false) {}
~TagBuilder() {
Clear();
}
TagBuilder(const TagBuilder &other) = delete;
TagBuilder &operator=(const TagBuilder &other) = delete;
/**
* Returns true if the tag contains no items. This ignores the "time"
* attribute.
*/
bool IsEmpty() const {
return items.empty();
}
/**
* Returns true if the object contains any information.
*/
gcc_pure
bool IsDefined() const {
return time >= 0 || has_playlist || !IsEmpty();
}
void Clear();
/**
* Move this object to the given #Tag instance. This object
* is empty afterwards.
*/
void Commit(Tag &tag);
/**
* Create a new #Tag instance from data in this object. The
* returned object is owned by the caller. This object is
* empty afterwards.
*/
Tag *Commit();
void SetTime(int _time) {
time = _time;
}
void SetHasPlaylist(bool _has_playlist) {
has_playlist = _has_playlist;
}
void Reserve(unsigned n) {
items.reserve(n);
}
/**
* Appends a new tag item.
*
* @param type the type of the new tag item
* @param value the value of the tag item (not null-terminated)
* @param len the length of #value
*/
gcc_nonnull_all
void AddItem(TagType type, const char *value, size_t length);
/**
* Appends a new tag item.
*
* @param type the type of the new tag item
* @param value the value of the tag item (null-terminated)
*/
gcc_nonnull_all
void AddItem(TagType type, const char *value);
private:
gcc_nonnull_all
void AddItemInternal(TagType type, const char *value, size_t length);
};
#endif
|
