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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: nodevisitor.hxx,v $
*
* $Revision: 1.5 $
*
* last change: $Author: hr $ $Date: 2006-06-19 23:24:01 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef CONFIGMGR_NODEVISITOR_HXX
#define CONFIGMGR_NODEVISITOR_HXX
namespace configmgr
{
// -----------------------------------------------------------------------------
namespace data
{
// -------------------------------------------------------------------------
class NodeAccessRef;
class ValueNodeAccess;
class GroupNodeAccess;
class SetNodeAccess;
class TreeAccessor;
// -------------------------------------------------------------------------
/** interface for a class that can be used to do some operation on a set of <type>NodeAccess</type>s
<p>Concrete classes should override at least one of the 'handle' methods.</p>
*/
class NodeVisitor
{
public:
/// returned from <method>handle</method> to indicate whether the operation is complete or should continue
enum Result { DONE, CONTINUE };
/// destructor. is pure to make this class abstract
virtual ~NodeVisitor() ; // = 0; - does not work well with SunCC 5.2
/// dispatch this to the children of <var>aNode</var>, until one returns DONE
Result visitChildren(GroupNodeAccess const& _aNode);
/// dispatch to <var>aNode</var> as the proper type
Result visitNode(NodeAccessRef const& _aNode);
protected:
/// do the operation on <var>aNode</var>. Default implementation returns CONTINUE.
virtual Result handle(NodeAccessRef const& _aNode);
/// do the operation on <var>aNode</var>. Default implementation calls handle(NodeAccess(_aNode));
virtual Result handle(ValueNodeAccess const& _aNode);
/** do the operation on <var>aNode</var>. Default implementation calls handle(NodeAccess(_aNode));
<p>To recursively visit the whole tree, call <method>visitChildren</method>
in the implementation</p>
*/
virtual Result handle(GroupNodeAccess const& _aNode);
/** do the operation on <var>aNode</var>. Default implementation calls handle(NodeAccess(_aNode));
<p>To recursively visit the whole tree, call <method>visitChildren</method>
in the implementation</p>
*/
virtual Result handle(SetNodeAccess const& _aNode);
struct Dispatcher;
friend struct Dispatcher;
};
inline NodeVisitor::~NodeVisitor() {}
// -------------------------------------------------------------------------
/** interface for a class that can be used to do some operation on a set of <type>TreeAccess</type>s
<p>Concrete classes should override at least one of the 'handle' methods.</p>
*/
class SetVisitor : public NodeVisitor
{
public:
/// destructor. is pure to make this class abstract
virtual ~SetVisitor() ; //= 0; - does not work well with SunCC 5.2
/// dispatch to <var>_aElementTree</var>
Result visitTree(TreeAccessor const& _aElementTree);
/// dispatch this to the elements of <var>aNode</var>, until one returns DONE
Result visitElements(SetNodeAccess const& _aNode);
protected:
using NodeVisitor::handle;
/// do the operation on <var>aNode</var>. Default implementation call NodeVisitor::visit for the rootnode.
virtual Result handle(TreeAccessor const& _aElementTree);
struct Dispatcher;
friend struct Dispatcher;
};
inline SetVisitor::~SetVisitor() {}
// -------------------------------------------------------------------------
}
// -----------------------------------------------------------------------------
} // namespace configmgr
#endif // CONFIGMGR_NODEVISITOR_HXX
|
