1/*
2 * Copyright (C) 2013 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#ifndef HTMLImport_h
32#define HTMLImport_h
33
34#include "wtf/Vector.h"
35
36namespace WebCore {
37
38class Frame;
39class Document;
40class Frame;
41class HTMLImportRoot;
42class HTMLImportsController;
43
44class HTMLImport {
45public:
46    static bool unblock(HTMLImport*);
47
48    virtual ~HTMLImport() { }
49
50    Frame* frame();
51    Document* master();
52    HTMLImportsController* controller();
53
54    bool isLoaded() const { return !isBlocked() && !isProcessing(); }
55    bool isBlocked() const { return m_blocked; }
56    void appendChild(HTMLImport*);
57
58    virtual HTMLImportRoot* root() = 0;
59    virtual HTMLImport* parent() const = 0;
60    virtual Document* document() const = 0;
61    virtual void wasDetachedFromDocument() = 0;
62    virtual void didFinishParsing() = 0;
63    virtual bool isProcessing() const = 0;
64
65protected:
66    HTMLImport()
67        : m_blocked(false)
68    { }
69
70private:
71    static void block(HTMLImport*);
72
73    void blockAfter(HTMLImport* child);
74    void block();
75    void unblock();
76    void didUnblock();
77
78    bool arePredecessorsLoaded() const;
79    bool areChilrenLoaded() const;
80    bool hasChildren() const { return !m_children.isEmpty(); }
81
82    Vector<HTMLImport*> m_children;
83    bool m_blocked; // If any of decendants or predecessors is in processing, it is blocked.
84};
85
86class HTMLImportRoot : public HTMLImport {
87public:
88    virtual void importWasDisposed() = 0;
89    virtual HTMLImportsController* toController() = 0;
90};
91
92} // namespace WebCore
93
94#endif // HTMLImport_h
95