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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <helper/ocomponentenumeration.hxx>
#include <vcl/svapp.hxx>
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;
// constructor
OComponentEnumeration::OComponentEnumeration( const Sequence< css::uno::Reference< XComponent > >& seqComponents )
: m_nPosition ( 0 ) // 0 is the first position for a valid list and the right value for an invalid list to!
, m_seqComponents ( seqComponents )
{}
// destructor
OComponentEnumeration::~OComponentEnumeration()
{
// Reset instance, free memory ....
impl_resetObject();
}
// XEventListener
void SAL_CALL OComponentEnumeration::disposing( const EventObject& aEvent ) throw( RuntimeException, std::exception )
{
SolarMutexGuard g;
// Safe impossible cases
// This method is not specified for all incoming parameters.
(void) aEvent;
SAL_WARN_IF( !aEvent.Source.is(), "fwk", "OComponentEnumeration::disposing(): Invalid parameter detected!" );
// Reset instance to defaults, release references and free memory.
impl_resetObject();
}
// XEnumeration
sal_Bool SAL_CALL OComponentEnumeration::hasMoreElements() throw( RuntimeException, std::exception )
{
SolarMutexGuard g;
// 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, std::exception )
{
SolarMutexGuard g;
// 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 than 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. Normally 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 normally 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;
}
} // namespace framework
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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