/*

 * Copyright (C) 2007 Apple Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#ifndef WTF_HashIterators_h

#define WTF_HashIterators_h

namespace WTF {

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator;

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator;

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator;

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator;

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {

    private:

        typedef std::pair<KeyType, MappedType> ValueType;

    public:

        typedef HashTableConstKeysIterator<HashTableType, KeyType, MappedType> Keys;

        typedef HashTableConstValuesIterator<HashTableType, KeyType, MappedType> Values;

        HashTableConstIteratorAdapter(const typename HashTableType::const_iterator& impl) : m_impl(impl) {}

        const ValueType* get() const { return (const ValueType*)m_impl.get(); }

        const ValueType& operator*() const { return *get(); }

        const ValueType* operator->() const { return get(); }

        HashTableConstIteratorAdapter& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        Keys keys() { return Keys(*this); }

        Values values() { return Values(*this); }

        typename HashTableType::const_iterator m_impl;

    };

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {

    private:

        typedef std::pair<KeyType, MappedType> ValueType;

    public:

        typedef HashTableKeysIterator<HashTableType, KeyType, MappedType> Keys;

        typedef HashTableValuesIterator<HashTableType, KeyType, MappedType> Values;

        HashTableIteratorAdapter(const typename HashTableType::iterator& impl) : m_impl(impl) {}

        ValueType* get() const { return (ValueType*)m_impl.get(); }

        ValueType& operator*() const { return *get(); }

        ValueType* operator->() const { return get(); }

        HashTableIteratorAdapter& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        operator HashTableConstIteratorAdapter<HashTableType, ValueType>() {

            typename HashTableType::const_iterator i = m_impl;

            return i;

        }

        Keys keys() { return Keys(*this); }

        Values values() { return Values(*this); }

        typename HashTableType::iterator m_impl;

    };

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator {

    private:

        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;

    public:

        HashTableConstKeysIterator(const ConstIterator& impl) : m_impl(impl) {}

        const KeyType* get() const { return &(m_impl.get()->first); }

        const KeyType& operator*() const { return *get(); }

        const KeyType* operator->() const { return get(); }

        HashTableConstKeysIterator& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        ConstIterator m_impl;

    };

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator {

    private:

        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;

    public:

        HashTableConstValuesIterator(const ConstIterator& impl) : m_impl(impl) {}

        const MappedType* get() const { return &(m_impl.get()->second); }

        const MappedType& operator*() const { return *get(); }

        const MappedType* operator->() const { return get(); }

        HashTableConstValuesIterator& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        ConstIterator m_impl;

    };

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator {

    private:

        typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;

        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;

    public:

        HashTableKeysIterator(const Iterator& impl) : m_impl(impl) {}

        KeyType* get() const { return &(m_impl.get()->first); }

        KeyType& operator*() const { return *get(); }

        KeyType* operator->() const { return get(); }

        HashTableKeysIterator& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        operator HashTableConstKeysIterator<HashTableType, KeyType, MappedType>() {

            ConstIterator i = m_impl;

            return i;

        }

        Iterator m_impl;

    };

    template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator {

    private:

        typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;

        typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;

    public:

        HashTableValuesIterator(const Iterator& impl) : m_impl(impl) {}

        MappedType* get() const { return &(m_impl.get()->second); }

        MappedType& operator*() const { return *get(); }

        MappedType* operator->() const { return get(); }

        HashTableValuesIterator& operator++() { ++m_impl; return *this; }

        // postfix ++ intentionally omitted

        operator HashTableConstValuesIterator<HashTableType, KeyType, MappedType>() {

            ConstIterator i = m_impl;

            return i;

        }

        Iterator m_impl;

    };

    template<typename T, typename U, typename V>

        inline bool operator==(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)

    {

        return a.m_impl == b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator!=(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)

    {

        return a.m_impl != b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator==(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)

    {

        return a.m_impl == b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator!=(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)

    {

        return a.m_impl != b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator==(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)

    {

        return a.m_impl == b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator!=(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)

    {

        return a.m_impl != b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator==(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)

    {

        return a.m_impl == b.m_impl;

    }

    template<typename T, typename U, typename V>

        inline bool operator!=(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)

    {

        return a.m_impl != b.m_impl;

    }

} // namespace WTF

#endif // WTF_HashIterators_h