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/*
* Copyright (C) 2011 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 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
internal class Rygel.MediaExport.NodeQueryContainer : QueryContainer {
private string template;
private string attribute;
public NodeQueryContainer (MediaCache cache,
SearchExpression expression,
string id,
string name,
string template,
string attribute) {
base (cache, expression, id, name);
this.template = template;
this.attribute = attribute;
// base constructor does count_children but it depends on template and
// attribute; so we have to call it again here after those two have
// been set.
try {
this.child_count = this.count_children ();
} catch (Error error) {};
}
// MediaContainer overrides
public override async MediaObjects? get_children
(uint offset,
uint max_count,
string? sort_criteria,
Cancellable? cancellable)
throws GLib.Error {
var children = new MediaObjects ();
var data = this.media_db.get_object_attribute_by_search_expression
(this.attribute,
this.expression,
// sort criteria
offset,
max_count);
foreach (var meta_data in data) {
var new_id = Uri.escape_string (meta_data, "", true);
// template contains URL escaped text. This means it might
// contain '%' chars which will makes sprintf crash
new_id = this.template.replace ("%s", new_id);
var factory = QueryContainerFactory.get_default ();
var container = factory.create_from_description (this.media_db,
new_id,
meta_data);
container.parent = this;
children.add (container);
}
return children;
}
// QueryContainer overrides
protected override int count_children () throws Error {
// Happens during construction
if (this.attribute == null || this.expression == null) {
return 0;
}
var data = this.media_db.get_object_attribute_by_search_expression
(this.attribute,
this.expression,
0,
-1);
return data.size;
}
}
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