1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 */
31
32#ifndef LinkLoader_h
33#define LinkLoader_h
34
35#include "CachedResourceClient.h"
36#include "CachedResourceHandle.h"
37#include "LinkLoaderClient.h"
38#include "Timer.h"
39
40#include <wtf/RefPtr.h>
41
42namespace WebCore {
43
44class Document;
45class URL;
46struct LinkRelAttribute;
47
48// The LinkLoader can load link rel types icon, dns-prefetch, subresource and prefetch.
49class LinkLoader : public CachedResourceClient {
50
51public:
52    explicit LinkLoader(LinkLoaderClient*);
53    virtual ~LinkLoader();
54
55    // from CachedResourceClient
56    virtual void notifyFinished(CachedResource*) override;
57
58    void released();
59    bool loadLink(const LinkRelAttribute&, const String& type, const String& sizes, const URL&, Document*);
60
61private:
62    void linkLoadTimerFired(Timer<LinkLoader>&);
63    void linkLoadingErrorTimerFired(Timer<LinkLoader>&);
64
65    LinkLoaderClient* m_client;
66
67    CachedResourceHandle<CachedResource> m_cachedLinkResource;
68    Timer<LinkLoader> m_linkLoadTimer;
69    Timer<LinkLoader> m_linkLoadingErrorTimer;
70};
71
72}
73
74#endif
75