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
|
/*
* Copyright (C) 2008 Zeeshan Ali <zeenix@gmail.com>.
* Copyright (C) 2008-2012 Nokia Corporation.
*
* Author: Zeeshan Ali <zeenix@gmail.com>
* Jens Georg <jensg@openismus.com>
* Jens Georg <mail@jensge.org>
*
* This file is part of Rygel.
*
* Rygel is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Rygel 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
using GUPnP;
using Gee;
/**
* Container listing possible values of a particuler Tracker metadata key.
* This class is used for multivalue properties such as nao:Tag (via
* nao:hasTag)
*/
public abstract class Rygel.Tracker.MetadataMultiValues : MetadataContainer {
public string[] key_chain;
protected MetadataMultiValues (string id,
MediaContainer parent,
string title,
ItemFactory item_factory,
string[] key_chain,
string? child_class = null) {
base (id, parent, title, item_factory, child_class);
this.key_chain = key_chain;
this.fetch_metadata_values.begin ();
}
protected override SelectionQuery create_query () {
this.triplets = new QueryTriplets ();
this.triplets.add (new QueryTriplet (SelectionQuery.ITEM_VARIABLE,
"a",
this.item_factory.category));
// All variables used in the query
var num_keys = this.key_chain.length - 1;
var variables = new string[num_keys];
for (int i = 0; i < num_keys; i++) {
variables[i] = "?" + key_chain[i].replace (":", "_");
string subject;
if (i == 0) {
subject = SelectionQuery.ITEM_VARIABLE;
} else {
subject = variables[i - 1];
}
this.triplets.add (new QueryTriplet (subject,
this.key_chain[i],
variables[i]));
}
// Variables to select from query
var selected = new ArrayList<string> ();
// Last variable is the only thing we are interested in the result
var last_variable = variables[num_keys - 1];
selected.add ("DISTINCT " + last_variable);
return new SelectionQuery (selected, triplets, null, last_variable);
}
protected override SearchContainer create_container (string id,
string title,
string value) {
// The child container can use the same triplets we used in our
// query.
var child_triplets = new QueryTriplets.clone (triplets);
// However we constrain the object of our last triplet.
var filters = new ArrayList<string> ();
var filter = this.create_filter (child_triplets.last ().obj, value);
filters.add (filter);
return new SearchContainer (id,
this,
title,
this.item_factory,
child_triplets,
filters);
}
}
|
