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#include "config.h"
27#include "IdentifierRep.h"
28#include "JSDOMBinding.h"
29
30#include "PlatformString.h"
31#include <runtime/UString.h>
32#include <wtf/HashMap.h>
33#include <wtf/StdLibExtras.h>
34
35using namespace JSC;
36
37namespace WebCore {
38
39typedef HashSet<IdentifierRep*> IdentifierSet;
40
41static IdentifierSet& identifierSet()
42{
43    DEFINE_STATIC_LOCAL(IdentifierSet, identifierSet, ());
44    return identifierSet;
45}
46
47typedef HashMap<int, IdentifierRep*> IntIdentifierMap;
48
49static IntIdentifierMap& intIdentifierMap()
50{
51    DEFINE_STATIC_LOCAL(IntIdentifierMap, intIdentifierMap, ());
52    return intIdentifierMap;
53}
54
55IdentifierRep* IdentifierRep::get(int intID)
56{
57    if (intID == 0 || intID == -1) {
58        static IdentifierRep* negativeOneAndZeroIdentifiers[2];
59
60        IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1];
61        if (!identifier) {
62            identifier = new IdentifierRep(intID);
63
64            negativeOneAndZeroIdentifiers[intID + 1] = identifier;
65        }
66
67        return identifier;
68    }
69
70    pair<IntIdentifierMap::iterator, bool> result = intIdentifierMap().add(intID, 0);
71    if (result.second) {
72        ASSERT(!result.first->second);
73        result.first->second = new IdentifierRep(intID);
74
75        identifierSet().add(result.first->second);
76    }
77
78    return result.first->second;
79}
80
81typedef HashMap<RefPtr<StringImpl>, IdentifierRep*> StringIdentifierMap;
82
83static StringIdentifierMap& stringIdentifierMap()
84{
85    DEFINE_STATIC_LOCAL(StringIdentifierMap, stringIdentifierMap, ());
86    return stringIdentifierMap;
87}
88
89IdentifierRep* IdentifierRep::get(const char* name)
90{
91    ASSERT(name);
92    if (!name)
93        return 0;
94
95    UString string = stringToUString(String::fromUTF8WithLatin1Fallback(name, strlen(name)));
96    pair<StringIdentifierMap::iterator, bool> result = stringIdentifierMap().add(string.impl(), 0);
97    if (result.second) {
98        ASSERT(!result.first->second);
99        result.first->second = new IdentifierRep(name);
100
101        identifierSet().add(result.first->second);
102    }
103
104    return result.first->second;
105}
106
107bool IdentifierRep::isValid(IdentifierRep* identifier)
108{
109    return identifierSet().contains(identifier);
110}
111
112} // namespace WebCore
113