libreoffice/framework/source/helper/ocomponentenumeration.cxx

/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2008 by Sun Microsystems, Inc.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * $RCSfile: ocomponentenumeration.cxx,v $
 * $Revision: 1.8 $
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_framework.hxx"

//_________________________________________________________________________________________________________________
//  my own includes
//_________________________________________________________________________________________________________________
#include <helper/ocomponentenumeration.hxx>

#ifndef _FRAMEWORK_THREADHELP_RESETABLEGUARD_HXX_
#include <threadhelp/resetableguard.hxx>
#endif

//_________________________________________________________________________________________________________________
//  interface includes
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  includes of other projects
//_________________________________________________________________________________________________________________
#include <vcl/svapp.hxx>

//_________________________________________________________________________________________________________________
//  namespace
//_________________________________________________________________________________________________________________

namespace framework{

using namespace ::com::sun::star::container     ;
using namespace ::com::sun::star::lang          ;
using namespace ::com::sun::star::uno           ;
using namespace ::cppu                          ;
using namespace ::osl                           ;
using namespace ::rtl                           ;

//_________________________________________________________________________________________________________________
//  non exported const
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  non exported definitions
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  declarations
//_________________________________________________________________________________________________________________

//*****************************************************************************************************************
//  constructor
//*****************************************************************************************************************
OComponentEnumeration::OComponentEnumeration( const Sequence< Reference< XComponent > >& seqComponents )
        //  Init baseclasses first
        //  Attention:
        //      Don't change order of initialization!
        //      ThreadHelpBase is a struct with a mutex as member. We can't use a mutex as member, while
        //      we must garant right initialization and a valid value of this! First initialize
        //      baseclasses and then members. And we need the mutex for other baseclasses !!!
        :   ThreadHelpBase  ( &Application::GetSolarMutex() )
        // Init member
        ,   m_nPosition     ( 0                             )   // 0 is the first position for a valid list and the right value for an invalid list to!
        ,   m_seqComponents ( seqComponents                 )
{
    // Safe impossible states
    // "Method" not defined for ALL parameters!
    LOG_ASSERT( impldbg_checkParameter_OComponentEnumerationCtor( seqComponents ), "OComponentEnumeration::OComponentEnumeration()\nInvalid parameter detected!\n" )
}

//*****************************************************************************************************************
//  destructor
//*****************************************************************************************************************
OComponentEnumeration::~OComponentEnumeration()
{
    // Reset instance, free memory ....
    impl_resetObject();
}

//*****************************************************************************************************************
//  XEventListener
//*****************************************************************************************************************
void SAL_CALL OComponentEnumeration::disposing( const EventObject&
#if OSL_DEBUG_LEVEL > 0
aEvent
#endif
) throw( RuntimeException )
{
    // Ready for multithreading
    ResetableGuard aGuard( m_aLock );

    // Safe impossible cases
    // This method is not specified for all incoming parameters.
    LOG_ASSERT( impldbg_checkParameter_disposing( aEvent ), "OComponentEnumeration::disposing()\nInvalid parameter detected!\n" )

    // Reset instance to defaults, release references and free memory.
    impl_resetObject();
}

//*****************************************************************************************************************
//  XEnumeration
//*****************************************************************************************************************
sal_Bool SAL_CALL OComponentEnumeration::hasMoreElements() throw( RuntimeException )
{
    // Ready for multithreading
    ResetableGuard aGuard( m_aLock );

    // First position in a valid list is 0.
    // => The last one is getLength() - 1!
    // m_nPosition's current value is the position for the next element, which will be return, if user call "nextElement()"
    // => We have more elements if current position less then the length of the list!
    return ( m_nPosition < (sal_uInt32)(m_seqComponents.getLength()) );
}

//*****************************************************************************************************************
//  XEnumeration
//*****************************************************************************************************************
Any SAL_CALL OComponentEnumeration::nextElement() throw(    NoSuchElementException  ,
                                                             WrappedTargetException ,
                                                            RuntimeException        )
{
    // Ready for multithreading
    ResetableGuard aGuard( m_aLock );

    // If we have no elements or end of enumeration is arrived ...
    if ( hasMoreElements() == sal_False )
    {
        // .. throw an exception!
        throw NoSuchElementException();
    }

    // Else; Get next element from list ...
    Any aComponent;
    aComponent <<= m_seqComponents[m_nPosition];
    // ... and step to next element!
    ++m_nPosition;

    // Return listitem.
    return aComponent;
}

//*****************************************************************************************************************
//  proteced method
//*****************************************************************************************************************
void OComponentEnumeration::impl_resetObject()
{
    // Attention:
    // Write this for multiple calls - NOT AT THE SAME TIME - but for more then one call again)!
    // It exist two ways to call this method. From destructor and from disposing().
    // I can't say, which one is the first. Normaly the disposing-call - but other way ....

    // Delete list of components.
    m_seqComponents.realloc( 0 );
    // Reset position in list.
    // The list has no elements anymore. m_nPosition is normaly the current position in list for nextElement!
    // But a position of 0 in a list of 0 items is an invalid state. This constellation can't work in future.
    // End of enumeration is arrived!
    // (see hasMoreElements() for more details...)
    m_nPosition = 0 ;
}

//_________________________________________________________________________________________________________________
//  debug methods
//_________________________________________________________________________________________________________________

/*-----------------------------------------------------------------------------------------------------------------
    The follow methods checks the parameter for other functions. If a parameter or his value is non valid,
    we return "sal_False". (else sal_True) This mechanism is used to throw an ASSERT!

    ATTENTION

        If you miss a test for one of this parameters, contact the autor or add it himself !(?)
        But ... look for right testing! See using of this methods!
-----------------------------------------------------------------------------------------------------------------*/

#ifdef ENABLE_ASSERTIONS

//*****************************************************************************************************************
// An empty list is allowed ... hasMoreElements() will return false then!
sal_Bool OComponentEnumeration::impldbg_checkParameter_OComponentEnumerationCtor( const Sequence< Reference< XComponent > >& seqComponents )
{
    // Set default return value.
    sal_Bool bOK = sal_True;
    // Check parameter.
    if  (
            ( &seqComponents == NULL )
        )
    {
        bOK = sal_False ;
    }
    // Return result of check.
    return bOK ;
}

//*****************************************************************************************************************
sal_Bool OComponentEnumeration::impldbg_checkParameter_disposing( const EventObject& aEvent )
{
    // Set default return value.
    sal_Bool bOK = sal_True;
    // Check parameter.
    if  (
            ( &aEvent               ==  NULL        )   ||
            ( aEvent.Source.is()    ==  sal_False   )
        )
    {
        bOK = sal_False ;
    }
    // Return result of check.
    return bOK ;
}

#endif  //  #ifdef ENABLE_ASSERTIONS

}       //  namespace framework