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#ifndef CHART2_EVENTLISTENERHELPER_HXX
#define CHART2_EVENTLISTENERHELPER_HXX

#include <com/sun/star/lang/XEventListener.hpp>
#include <com/sun/star/lang/XComponent.hpp>

#include <list>
#include <algorithm>
#include <functional>
#include <utility>

namespace chart
{
namespace EventListenerHelper
{

namespace impl
{

template< class InterfaceRef >
struct addListenerFunctor : public ::std::unary_function< InterfaceRef, void >
{
    explicit addListenerFunctor( const ::com::sun::star::uno::Reference<
                                     ::com::sun::star::lang::XEventListener > & xListener ) :
            m_xListener( xListener )
    {}

    void operator() ( const InterfaceRef & xObject )
    {
        ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent >
              xBroadcaster( xObject, ::com::sun::star::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->addEventListener( m_xListener );
    }
private:
    ::com::sun::star::uno::Reference< ::com::sun::star::lang::XEventListener > m_xListener;
};

template< class InterfaceRef >
struct removeListenerFunctor : public ::std::unary_function< InterfaceRef, void >
{
    explicit removeListenerFunctor( const ::com::sun::star::uno::Reference<
                                        ::com::sun::star::lang::XEventListener > & xListener ) :
            m_xListener( xListener )
    {}

    void operator() ( const InterfaceRef & xObject )
    {
        ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent >
              xBroadcaster( xObject, ::com::sun::star::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->removeEventListener( m_xListener );
    }
private:
    ::com::sun::star::uno::Reference< ::com::sun::star::lang::XEventListener > m_xListener;
};

template< class Pair >
struct addListenerToMappedElementFunctor : public ::std::unary_function< Pair, void >
{
    explicit addListenerToMappedElementFunctor( const ::com::sun::star::uno::Reference<
                                                    ::com::sun::star::lang::XEventListener > & xListener ) :
            m_xListener( xListener )
    {}

    void operator() ( const Pair & aPair )
    {
        ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent >
              xBroadcaster( aPair.second, ::com::sun::star::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->addEventListener( m_xListener );
    }
private:
    ::com::sun::star::uno::Reference< ::com::sun::star::lang::XEventListener > m_xListener;
};

template< class Pair >
struct removeListenerFromMappedElementFunctor : public ::std::unary_function< Pair, void >
{
    explicit removeListenerFromMappedElementFunctor( const ::com::sun::star::uno::Reference<
                                                         ::com::sun::star::lang::XEventListener > & xListener ) :
            m_xListener( xListener )
    {}

    void operator() ( const Pair & aPair )
    {
        ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent >
              xBroadcaster( aPair.second, ::com::sun::star::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->removeEventListener( m_xListener );
    }
private:
    ::com::sun::star::uno::Reference< ::com::sun::star::lang::XEventListener > m_xListener;
};

} //  namespace impl

// --------------------------------------------------------------------------------

template< class InterfaceRef >
void addListener(
    const InterfaceRef & xObject,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
    {
        impl::addListenerFunctor< InterfaceRef > aFunctor( xListener );
        aFunctor( xObject );
    }
}

template< class Container >
void addListenerToAllElements(
    const Container & rContainer,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rContainer.begin(), rContainer.end(),
                         impl::addListenerFunctor< typename Container::value_type >( xListener ));
}

template< class Container >
void addListenerToAllMapElements(
    const Container & rContainer,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rContainer.begin(), rContainer.end(),
                         impl::addListenerToMappedElementFunctor< typename Container::value_type >( xListener ));
}

template< typename T >
void addListenerToAllSequenceElements(
    const ::com::sun::star::uno::Sequence< T > & rSequence,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rSequence.getConstArray(), rSequence.getConstArray() + rSequence.getLength(),
                         impl::addListenerFunctor< T >( xListener ));
}

template< class InterfaceRef >
void removeListener(
    const InterfaceRef & xObject,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
    {
        impl::removeListenerFunctor< InterfaceRef > aFunctor( xListener );
        aFunctor( xObject );
    }
}

template< class Container >
void removeListenerFromAllElements(
    const Container & rContainer,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rContainer.begin(), rContainer.end(),
                         impl::removeListenerFunctor< typename Container::value_type >( xListener ));
}

template< class Container >
void removeListenerFromAllMapElements(
    const Container & rContainer,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rContainer.begin(), rContainer.end(),
                         impl::removeListenerFromMappedElementFunctor< typename Container::value_type >( xListener ));
}

template< typename T >
void removeListenerFromAllSequenceElements(
    const ::com::sun::star::uno::Sequence< T > & rSequence,
    const ::com::sun::star::uno::Reference<
        ::com::sun::star::lang::XEventListener > & xListener )
{
    if( xListener.is())
        ::std::for_each( rSequence.getConstArray(), rSequence.getConstArray() + rSequence.getLength(),
                         impl::removeListenerFunctor< T >( xListener ));
}

} //  namespace EventListenerHelper
} //  namespace chart

// CHART2_EVENTLISTENERHELPER_HXX
#endif

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