weakeventlistener.cxx

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#include <comphelper/weakeventlistener.hxx>
#include <osl/diagnose.h>
 
 
namespace comphelper
{
 
 
    using namespace ::com::sun::star::uno;
    using namespace ::com::sun::star::lang;
 
    OWeakListenerAdapterBase::~OWeakListenerAdapterBase()
    {
    }
 
    OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > const & _rxListener, Reference< XComponent > const & _rxBroadcaster )
        :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
    {
        // add ourself as listener to the broadcaster
        OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
        if ( _rxBroadcaster.is() )
        {
            osl_atomic_increment( &m_refCount );
            {
                _rxBroadcaster->addEventListener( this );
            }
            osl_atomic_decrement( &m_refCount );
            OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
                // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
                // holds its listeners hard, and forward all calls then to another listener (L) which is
                // held weak by A.
                // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
        }
 
        OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
    }
 
 
    void OWeakEventListenerAdapter::disposing( std::unique_lock<std::mutex>& /*rGuard*/ )
    {
        Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
        OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
        if ( xBroadcaster.is() )
        {
            xBroadcaster->removeEventListener( this );
        }
 
        resetListener();
    }
 
 
}   // namespace comphelper
 
 
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