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/*************************************************************************
* 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: code,v $
*
* $Revision: 1.3 $
*
* 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.
************************************************************************/
#ifndef SVX_TREE_VISITOR_HXX
#define SVX_TREE_VISITOR_HXX
#include <stack>
template< class ELEMENT, class NODEINFO, class PROCESSOR >
class TreeVisitor
{
public:
TreeVisitor( NODEINFO _nodeInfo )
:m_visitedRoot( false )
,m_root()
,m_current()
,m_nodeInfo( _nodeInfo )
{
}
void process( const ELEMENT& _root, PROCESSOR& _processor )
{
m_root = _root;
m_visitedRoot = false;
while ( do_step() )
_processor.process( m_current );
}
private:
bool do_step();
private:
bool m_visitedRoot;
ELEMENT m_root;
ELEMENT m_current;
const NODEINFO m_nodeInfo;
::std::stack< size_t > m_pathToCurrent;
::std::stack< ELEMENT > m_currentAncestors;
};
template< class ELEMENT, class NODEINFO, class PROCESSOR >
bool TreeVisitor< ELEMENT, NODEINFO, PROCESSOR >::do_step()
{
if ( !m_visitedRoot )
{
m_current = m_root;
m_visitedRoot = true;
return true;
}
// can we step down from the current node?
size_t childCount = m_nodeInfo.childCount( m_current );
if ( childCount )
{
m_currentAncestors.push( m_current );
m_current = m_nodeInfo.getChild( m_current, 0 );
m_pathToCurrent.push( 0 );
return true;
}
// is there a right sibling of the current node?
while ( !m_pathToCurrent.empty() )
{
const ELEMENT& currentParent = m_currentAncestors.top();
childCount = m_nodeInfo.childCount( currentParent );
size_t currentChildPos = m_pathToCurrent.top();
if ( ++currentChildPos < childCount )
{
// yes there is
m_pathToCurrent.top() = currentChildPos;
m_current = m_nodeInfo.getChild( currentParent, currentChildPos );
return true;
}
// no there isn't => step up
m_currentAncestors.pop();
m_pathToCurrent.pop();
}
return false;
}
#endif // SVX_TREE_VISITOR_HXX
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