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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_FRAMEWORK_SOURCE_INC_ACCELERATORS_ACCELERATORCACHE_HXX
#define INCLUDED_FRAMEWORK_SOURCE_INC_ACCELERATORS_ACCELERATORCACHE_HXX

#include <stdtypes.h>

#include <com/sun/star/awt/KeyEvent.hpp>

#include <unordered_map>
#include <vector>

// definition

namespace framework
{

/**
    @short  implements a cache for any accelerator configuration.

    @descr  It's implemented threadsafe, supports copy-on-write pattern
            and a flush mechanism to support concurrent access to the same
            configuration.

            copy-on-write ... How? Do the following:
 */
class AcceleratorCache
{

    // const, types

    public:

        /** TODO document me
            commands -> keys
        */
        typedef ::std::vector< css::awt::KeyEvent > TKeyList;
        typedef std::unordered_map<OUString, TKeyList> TCommand2Keys;

        /** TODO document me
            keys -> commands
        */
        typedef std::unordered_map< css::awt::KeyEvent ,
                                    OUString    ,
                                    KeyEventHashCode   ,
                                    KeyEventEqualsFunc > TKey2Commands;

    // member

    private:

        /** map commands to keys in relation 1:n.
            First key is interpreted as preferred one! */
        TCommand2Keys m_lCommand2Keys;

        /** map keys to commands in relation 1:1. */
        TKey2Commands m_lKey2Commands;

    // interface

    public:
        /** @short  checks if the specified key exists.

            @param  aKey
                    the key, which should be checked.

            @return [bool]
                    sal_True if the specified key exists inside this container.
         */
        bool hasKey(const css::awt::KeyEvent& aKey) const;
        bool hasCommand(const OUString& sCommand) const;

        /** TODO document me */
        TKeyList getAllKeys() const;

        /** @short  add a new or change an existing key-command pair
                    of this container.

            @param  aKey
                    describe the key.

            @param  sCommand
                    describe the command.
          */
        void setKeyCommandPair(const css::awt::KeyEvent& aKey    ,
                                       const OUString&    sCommand);

        /** @short  returns the list of keys, which are registered
                    for this command.

            @param  sCommand
                    describe the command.

            @return [TKeyList]
                    the list of registered keys. Can be empty!
          */
        TKeyList getKeysByCommand(const OUString& sCommand) const;

        /** TODO */
        OUString getCommandByKey(const css::awt::KeyEvent& aKey) const;

        /** TODO */
        void removeKey(const css::awt::KeyEvent& aKey);
        void removeCommand(const OUString& sCommand);
};

} // namespace framework

#endif // INCLUDED_FRAMEWORK_SOURCE_INC_ACCELERATORS_ACCELERATORCACHE_HXX

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