1/*
2 * Copyright (C) 2009 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 IdentifierRep_h
27#define IdentifierRep_h
28
29#include <wtf/Assertions.h>
30#include <wtf/FastAllocBase.h>
31#include <wtf/StringExtras.h>
32#include <string.h>
33
34namespace WebCore {
35
36class IdentifierRep {
37    WTF_MAKE_FAST_ALLOCATED;
38public:
39    static IdentifierRep* get(int);
40    static IdentifierRep* get(const char*);
41
42    static bool isValid(IdentifierRep*);
43
44    bool isString() const { return m_isString; }
45
46    int number() const { return m_isString ? 0 : m_value.m_number; }
47    const char* string() const { return m_isString ? m_value.m_string : 0; }
48
49private:
50    explicit IdentifierRep(int number)
51        : m_isString(false)
52    {
53        m_value.m_number = number;
54    }
55
56    explicit IdentifierRep(const char* name)
57        : m_isString(true)
58    {
59        m_value.m_string = fastStrDup(name);
60    }
61
62    ~IdentifierRep(); // Not implemented
63
64    union {
65        const char* m_string;
66        int m_number;
67    } m_value;
68    bool m_isString;
69};
70
71} // namespace WebCore
72
73#endif // IdentifierRep_h
74