1/*
2 * Copyright (C) 2007 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 WTF_HashIterators_h
27#define WTF_HashIterators_h
28
29namespace WTF {
30
31    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator;
32    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator;
33    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator;
34    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator;
35
36    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {
37    private:
38        typedef std::pair<KeyType, MappedType> ValueType;
39    public:
40        typedef HashTableConstKeysIterator<HashTableType, KeyType, MappedType> Keys;
41        typedef HashTableConstValuesIterator<HashTableType, KeyType, MappedType> Values;
42
43        HashTableConstIteratorAdapter(const typename HashTableType::const_iterator& impl) : m_impl(impl) {}
44
45        const ValueType* get() const { return (const ValueType*)m_impl.get(); }
46        const ValueType& operator*() const { return *get(); }
47        const ValueType* operator->() const { return get(); }
48
49        HashTableConstIteratorAdapter& operator++() { ++m_impl; return *this; }
50        // postfix ++ intentionally omitted
51
52        Keys keys() { return Keys(*this); }
53        Values values() { return Values(*this); }
54
55        typename HashTableType::const_iterator m_impl;
56    };
57
58    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {
59    private:
60        typedef std::pair<KeyType, MappedType> ValueType;
61    public:
62        typedef HashTableKeysIterator<HashTableType, KeyType, MappedType> Keys;
63        typedef HashTableValuesIterator<HashTableType, KeyType, MappedType> Values;
64
65        HashTableIteratorAdapter(const typename HashTableType::iterator& impl) : m_impl(impl) {}
66
67        ValueType* get() const { return (ValueType*)m_impl.get(); }
68        ValueType& operator*() const { return *get(); }
69        ValueType* operator->() const { return get(); }
70
71        HashTableIteratorAdapter& operator++() { ++m_impl; return *this; }
72        // postfix ++ intentionally omitted
73
74        operator HashTableConstIteratorAdapter<HashTableType, ValueType>() {
75            typename HashTableType::const_iterator i = m_impl;
76            return i;
77        }
78
79        Keys keys() { return Keys(*this); }
80        Values values() { return Values(*this); }
81
82        typename HashTableType::iterator m_impl;
83    };
84
85    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator {
86    private:
87        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
88
89    public:
90        HashTableConstKeysIterator(const ConstIterator& impl) : m_impl(impl) {}
91
92        const KeyType* get() const { return &(m_impl.get()->first); }
93        const KeyType& operator*() const { return *get(); }
94        const KeyType* operator->() const { return get(); }
95
96        HashTableConstKeysIterator& operator++() { ++m_impl; return *this; }
97        // postfix ++ intentionally omitted
98
99        ConstIterator m_impl;
100    };
101
102    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator {
103    private:
104        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
105
106    public:
107        HashTableConstValuesIterator(const ConstIterator& impl) : m_impl(impl) {}
108
109        const MappedType* get() const { return &(m_impl.get()->second); }
110        const MappedType& operator*() const { return *get(); }
111        const MappedType* operator->() const { return get(); }
112
113        HashTableConstValuesIterator& operator++() { ++m_impl; return *this; }
114        // postfix ++ intentionally omitted
115
116        ConstIterator m_impl;
117    };
118
119    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator {
120    private:
121        typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;
122        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
123
124    public:
125        HashTableKeysIterator(const Iterator& impl) : m_impl(impl) {}
126
127        KeyType* get() const { return &(m_impl.get()->first); }
128        KeyType& operator*() const { return *get(); }
129        KeyType* operator->() const { return get(); }
130
131        HashTableKeysIterator& operator++() { ++m_impl; return *this; }
132        // postfix ++ intentionally omitted
133
134        operator HashTableConstKeysIterator<HashTableType, KeyType, MappedType>() {
135            ConstIterator i = m_impl;
136            return i;
137        }
138
139        Iterator m_impl;
140    };
141
142    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator {
143    private:
144        typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;
145        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
146
147    public:
148        HashTableValuesIterator(const Iterator& impl) : m_impl(impl) {}
149
150        MappedType* get() const { return &(m_impl.get()->second); }
151        MappedType& operator*() const { return *get(); }
152        MappedType* operator->() const { return get(); }
153
154        HashTableValuesIterator& operator++() { ++m_impl; return *this; }
155        // postfix ++ intentionally omitted
156
157        operator HashTableConstValuesIterator<HashTableType, KeyType, MappedType>() {
158            ConstIterator i = m_impl;
159            return i;
160        }
161
162        Iterator m_impl;
163    };
164
165    template<typename T, typename U, typename V>
166        inline bool operator==(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)
167    {
168        return a.m_impl == b.m_impl;
169    }
170
171    template<typename T, typename U, typename V>
172        inline bool operator!=(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)
173    {
174        return a.m_impl != b.m_impl;
175    }
176
177    template<typename T, typename U, typename V>
178        inline bool operator==(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)
179    {
180        return a.m_impl == b.m_impl;
181    }
182
183    template<typename T, typename U, typename V>
184        inline bool operator!=(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)
185    {
186        return a.m_impl != b.m_impl;
187    }
188
189    template<typename T, typename U, typename V>
190        inline bool operator==(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)
191    {
192        return a.m_impl == b.m_impl;
193    }
194
195    template<typename T, typename U, typename V>
196        inline bool operator!=(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)
197    {
198        return a.m_impl != b.m_impl;
199    }
200
201    template<typename T, typename U, typename V>
202        inline bool operator==(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)
203    {
204        return a.m_impl == b.m_impl;
205    }
206
207    template<typename T, typename U, typename V>
208        inline bool operator!=(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)
209    {
210        return a.m_impl != b.m_impl;
211    }
212
213
214} // namespace WTF
215
216#endif // WTF_HashIterators_h
217