1/*
2 * Copyright (C) 2003, 2006, 2008 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef FontFamily_h
27#define FontFamily_h
28
29#include "platform/PlatformExport.h"
30#include "wtf/RefCounted.h"
31#include "wtf/RefPtr.h"
32#include "wtf/text/AtomicString.h"
33
34namespace blink {
35
36class SharedFontFamily;
37
38class PLATFORM_EXPORT FontFamily {
39public:
40    FontFamily() { }
41    ~FontFamily();
42
43    void setFamily(const AtomicString& family) { m_family = family; }
44    const AtomicString& family() const { return m_family; }
45    bool familyIsEmpty() const { return m_family.isEmpty(); }
46
47    const FontFamily* next() const;
48
49    void appendFamily(PassRefPtr<SharedFontFamily>);
50    PassRefPtr<SharedFontFamily> releaseNext();
51
52private:
53    AtomicString m_family;
54    RefPtr<SharedFontFamily> m_next;
55};
56
57class PLATFORM_EXPORT SharedFontFamily : public FontFamily, public RefCounted<SharedFontFamily> {
58public:
59    static PassRefPtr<SharedFontFamily> create()
60    {
61        return adoptRef(new SharedFontFamily);
62    }
63
64private:
65    SharedFontFamily() { }
66};
67
68PLATFORM_EXPORT bool operator==(const FontFamily&, const FontFamily&);
69inline bool operator!=(const FontFamily& a, const FontFamily& b) { return !(a == b); }
70
71inline FontFamily::~FontFamily()
72{
73    RefPtr<SharedFontFamily> reaper = m_next.release();
74    while (reaper && reaper->hasOneRef())
75        reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper
76}
77
78inline const FontFamily* FontFamily::next() const
79{
80    return m_next.get();
81}
82
83inline void FontFamily::appendFamily(PassRefPtr<SharedFontFamily> family)
84{
85    m_next = family;
86}
87
88inline PassRefPtr<SharedFontFamily> FontFamily::releaseNext()
89{
90    return m_next.release();
91}
92
93} // namespace blink
94
95#endif
96