xref: /aoo41x/main/unotools/source/config/confignode.cxx (revision b5088357)

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 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



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

#include <unotools/confignode.hxx>
#include <unotools/configpathes.hxx>
#include <tools/diagnose_ex.h>
#include <osl/diagnose.h>
#include <com/sun/star/container/XHierarchicalName.hpp>
#include <com/sun/star/beans/PropertyValue.hpp>
#include <com/sun/star/lang/XSingleServiceFactory.hpp>
#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/util/XStringEscape.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/container/XNamed.hpp>
#include <comphelper/extract.hxx>
#include <comphelper/componentcontext.hxx>
#include <comphelper/namedvaluecollection.hxx>
#include <rtl/string.hxx>
#if OSL_DEBUG_LEVEL > 0
#include <rtl/strbuf.hxx>
#endif

//........................................................................
namespace utl
{
//........................................................................

	using namespace ::com::sun::star::uno;
	using namespace ::com::sun::star::lang;
	using namespace ::com::sun::star::util;
	using namespace ::com::sun::star::beans;
	using namespace ::com::sun::star::container;

	//========================================================================
	//= OConfigurationNode
	//========================================================================
	//------------------------------------------------------------------------
	OConfigurationNode::OConfigurationNode(const Reference< XInterface >& _rxNode )
		:m_bEscapeNames(sal_False)
	{
		OSL_ENSURE(_rxNode.is(), "OConfigurationNode::OConfigurationNode: invalid node interface!");
		if (_rxNode.is())
		{
			// collect all interfaces necessary
			m_xHierarchyAccess = Reference< XHierarchicalNameAccess >(_rxNode, UNO_QUERY);
			m_xDirectAccess = Reference< XNameAccess >(_rxNode, UNO_QUERY);

			// reset _all_ interfaces if _one_ of them is not supported
			if (!m_xHierarchyAccess.is() || !m_xDirectAccess.is())
			{
				m_xHierarchyAccess = NULL;
				m_xDirectAccess = NULL;
			}

			// now for the non-critical interfaces
			m_xReplaceAccess = Reference< XNameReplace >(_rxNode, UNO_QUERY);
			m_xContainerAccess = Reference< XNameContainer >(_rxNode, UNO_QUERY);
		}

		Reference< XComponent > xConfigNodeComp(m_xDirectAccess, UNO_QUERY);
		if (xConfigNodeComp.is())
			startComponentListening(xConfigNodeComp);

		if (isValid())
			setEscape(isSetNode());
	}

	//------------------------------------------------------------------------
	OConfigurationNode::OConfigurationNode(const OConfigurationNode& _rSource)
		:OEventListenerAdapter()
		,m_xHierarchyAccess(_rSource.m_xHierarchyAccess)
		,m_xDirectAccess(_rSource.m_xDirectAccess)
		,m_xReplaceAccess(_rSource.m_xReplaceAccess)
		,m_xContainerAccess(_rSource.m_xContainerAccess)
		,m_bEscapeNames(_rSource.m_bEscapeNames)
		,m_sCompletePath(_rSource.m_sCompletePath)
	{
		Reference< XComponent > xConfigNodeComp(m_xDirectAccess, UNO_QUERY);
		if (xConfigNodeComp.is())
			startComponentListening(xConfigNodeComp);
	}

	//------------------------------------------------------------------------
	const OConfigurationNode& OConfigurationNode::operator=(const OConfigurationNode& _rSource)
	{
		stopAllComponentListening();

		m_xHierarchyAccess = _rSource.m_xHierarchyAccess;
		m_xDirectAccess = _rSource.m_xDirectAccess;
		m_xContainerAccess = _rSource.m_xContainerAccess;
		m_xReplaceAccess = _rSource.m_xReplaceAccess;
		m_bEscapeNames = _rSource.m_bEscapeNames;
		m_sCompletePath = _rSource.m_sCompletePath;

		Reference< XComponent > xConfigNodeComp(m_xDirectAccess, UNO_QUERY);
		if (xConfigNodeComp.is())
			startComponentListening(xConfigNodeComp);

		return *this;
	}

	//------------------------------------------------------------------------
	void OConfigurationNode::_disposing( const EventObject& _rSource )
	{
		Reference< XComponent > xDisposingSource(_rSource.Source, UNO_QUERY);
		Reference< XComponent > xConfigNodeComp(m_xDirectAccess, UNO_QUERY);
		if (xDisposingSource.get() == xConfigNodeComp.get())
			clear();
	}

	//------------------------------------------------------------------------
    ::rtl::OUString OConfigurationNode::getLocalName() const
    {
        ::rtl::OUString sLocalName;
        try
        {
            Reference< XNamed > xNamed( m_xDirectAccess, UNO_QUERY_THROW );
            sLocalName = xNamed->getName();
        }
        catch( const Exception& )
        {
        	DBG_UNHANDLED_EXCEPTION();
        }
        return sLocalName;
    }

	//------------------------------------------------------------------------
    ::rtl::OUString OConfigurationNode::getNodePath() const
    {
        ::rtl::OUString sNodePath;
        try
        {
            Reference< XHierarchicalName > xNamed( m_xDirectAccess, UNO_QUERY_THROW );
            sNodePath = xNamed->getHierarchicalName();
        }
        catch( const Exception& )
        {
        	DBG_UNHANDLED_EXCEPTION();
        }
        return sNodePath;
    }

	//------------------------------------------------------------------------
	::rtl::OUString OConfigurationNode::normalizeName(const ::rtl::OUString& _rName, NAMEORIGIN _eOrigin) const
	{
		::rtl::OUString sName(_rName);
		if (getEscape())
		{
			Reference< XStringEscape > xEscaper(m_xDirectAccess, UNO_QUERY);
			if (xEscaper.is() && sName.getLength())
			{
				try
				{
					if (NO_CALLER == _eOrigin)
						sName = xEscaper->escapeString(sName);
					else
						sName = xEscaper->unescapeString(sName);
				}
				catch(Exception&)
				{
					DBG_UNHANDLED_EXCEPTION();
				}
			}
		}
		return sName;
	}

	//------------------------------------------------------------------------
	Sequence< ::rtl::OUString > OConfigurationNode::getNodeNames() const throw()
	{
		OSL_ENSURE(m_xDirectAccess.is(), "OConfigurationNode::getNodeNames: object is invalid!");
		Sequence< ::rtl::OUString > aReturn;
		if (m_xDirectAccess.is())
		{
			try
			{
				aReturn = m_xDirectAccess->getElementNames();
				// normalize the names
				::rtl::OUString* pNames = aReturn.getArray();
				for (sal_Int32 i=0; i<aReturn.getLength(); ++i, ++pNames)
					*pNames = normalizeName(*pNames, NO_CONFIGURATION);
			}
			catch(Exception&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::getNodeNames: caught a generic exception!");
			}
		}

		return aReturn;
	}

	//------------------------------------------------------------------------
	sal_Bool OConfigurationNode::removeNode(const ::rtl::OUString& _rName) const throw()
	{
		OSL_ENSURE(m_xContainerAccess.is(), "OConfigurationNode::removeNode: object is invalid!");
		if (m_xContainerAccess.is())
		{
			try
			{
				::rtl::OUString sName = normalizeName(_rName, NO_CALLER);
				m_xContainerAccess->removeByName(sName);
				return sal_True;
			}
			catch (NoSuchElementException&)
			{
                #if OSL_DEBUG_LEVEL > 0
                rtl::OStringBuffer aBuf( 256 );
                aBuf.append("OConfigurationNode::removeNode: there is no element named!");
                aBuf.append( rtl::OUStringToOString( _rName, RTL_TEXTENCODING_ASCII_US ) );
                aBuf.append( "!" );
				OSL_ENSURE(sal_False, aBuf.getStr());
                #endif
			}
			catch (WrappedTargetException&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::removeNode: caught a WrappedTargetException!");
			}
			catch(Exception&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::removeNode: caught a generic exception!");
			}
		}
		return sal_False;
	}
	//------------------------------------------------------------------------
	OConfigurationNode OConfigurationNode::insertNode(const ::rtl::OUString& _rName,const Reference< XInterface >& _xNode) const throw()
	{
		if(_xNode.is())
		{
			try
			{
				::rtl::OUString sName = normalizeName(_rName, NO_CALLER);
				m_xContainerAccess->insertByName(sName, makeAny(_xNode));
				// if we're here, all was ok ...
				return OConfigurationNode( _xNode );
			}
			catch(const Exception&)
			{
                DBG_UNHANDLED_EXCEPTION();
			}

			// dispose the child if it has already been created, but could not be inserted
			Reference< XComponent > xChildComp(_xNode, UNO_QUERY);
			if (xChildComp.is())
				try { xChildComp->dispose(); } catch(Exception&) { }
		}

		return OConfigurationNode();
	}
	//------------------------------------------------------------------------
	OConfigurationNode OConfigurationNode::createNode(const ::rtl::OUString& _rName) const throw()
	{
		Reference< XSingleServiceFactory > xChildFactory(m_xContainerAccess, UNO_QUERY);
		OSL_ENSURE(xChildFactory.is(), "OConfigurationNode::createNode: object is invalid or read-only!");

		if (xChildFactory.is())	// implies m_xContainerAccess.is()
		{
			Reference< XInterface > xNewChild;
			try
			{
				xNewChild = xChildFactory->createInstance();
			}
			catch(const Exception&)
			{
                DBG_UNHANDLED_EXCEPTION();
			}
			return insertNode(_rName,xNewChild);
		}

		return OConfigurationNode();
	}

	//------------------------------------------------------------------------
	OConfigurationNode OConfigurationNode::appendNode(const ::rtl::OUString& _rName,const OConfigurationNode& _aNewNode) const throw()
	{
		return insertNode(_rName,_aNewNode.m_xDirectAccess);
	}
	//------------------------------------------------------------------------
	OConfigurationNode OConfigurationNode::openNode(const ::rtl::OUString& _rPath) const throw()
	{
		OSL_ENSURE(m_xDirectAccess.is(), "OConfigurationNode::openNode: object is invalid!");
		OSL_ENSURE(m_xHierarchyAccess.is(), "OConfigurationNode::openNode: object is invalid!");
		try
		{
			::rtl::OUString sNormalized = normalizeName(_rPath, NO_CALLER);

			Reference< XInterface > xNode;
			if (m_xDirectAccess.is() && m_xDirectAccess->hasByName(sNormalized))
			{
				if (!::cppu::extractInterface(xNode, m_xDirectAccess->getByName(sNormalized)))
				    OSL_ENSURE(sal_False, "OConfigurationNode::openNode: could not open the node!");
			}
			else if (m_xHierarchyAccess.is())
			{
				if (!::cppu::extractInterface(xNode, m_xHierarchyAccess->getByHierarchicalName(_rPath)))
				    OSL_ENSURE(sal_False, "OConfigurationNode::openNode: could not open the node!");
			}
            if (xNode.is())
			    return OConfigurationNode( xNode );
		}
		catch(NoSuchElementException& e)
		{
            (void)e;
            #if OSL_DEBUG_LEVEL > 0
            rtl::OStringBuffer aBuf( 256 );
            aBuf.append("OConfigurationNode::openNode: there is no element named ");
            aBuf.append( rtl::OUStringToOString( _rPath, RTL_TEXTENCODING_ASCII_US ) );
            aBuf.append("!");
			OSL_ENSURE(sal_False, aBuf.getStr());
            #endif
		}
		catch(Exception&)
		{
			OSL_ENSURE(sal_False, "OConfigurationNode::openNode: caught an exception while retrieving the node!");
		}
		return OConfigurationNode();
	}

	//------------------------------------------------------------------------
	void OConfigurationNode::setEscape(sal_Bool _bEnable)
	{
        m_bEscapeNames = _bEnable && Reference< XStringEscape >::query(m_xDirectAccess).is();
	}

	//------------------------------------------------------------------------
	sal_Bool OConfigurationNode::isSetNode() const
	{
		sal_Bool bIsSet = sal_False;
		Reference< XServiceInfo > xSI(m_xHierarchyAccess, UNO_QUERY);
		if (xSI.is())
		{
			try { bIsSet = xSI->supportsService(::rtl::OUString::createFromAscii("com.sun.star.configuration.SetAccess")); }
			catch(Exception&) { }
		}
		return bIsSet;
	}

	//---------------------------------------------------------------------
	//--- 20.08.01 19:03:20 -----------------------------------------------

	sal_Bool OConfigurationNode::hasByHierarchicalName( const ::rtl::OUString& _rName ) const throw()
	{
		OSL_ENSURE( m_xHierarchyAccess.is(), "OConfigurationNode::hasByHierarchicalName: no hierarchy access!" );
		try
		{
			if ( m_xHierarchyAccess.is() )
			{
				::rtl::OUString sName = normalizeName( _rName, NO_CALLER );
				return m_xHierarchyAccess->hasByHierarchicalName( sName );
			}
		}
		catch(Exception&)
		{
		}
		return sal_False;
	}

	//------------------------------------------------------------------------
	sal_Bool OConfigurationNode::hasByName(const ::rtl::OUString& _rName) const throw()
	{
		OSL_ENSURE(m_xDirectAccess.is(), "OConfigurationNode::hasByName: object is invalid!");
		try
		{
			::rtl::OUString sName = normalizeName(_rName, NO_CALLER);
			if (m_xDirectAccess.is())
				return m_xDirectAccess->hasByName(sName);
		}
		catch(Exception&)
		{
		}
		return sal_False;
	}

	//------------------------------------------------------------------------
	sal_Bool OConfigurationNode::setNodeValue(const ::rtl::OUString& _rPath, const Any& _rValue) const throw()
	{
        sal_Bool bResult = false;

		OSL_ENSURE(m_xReplaceAccess.is(), "OConfigurationNode::setNodeValue: object is invalid!");
		if (m_xReplaceAccess.is())
		{
			try
			{
			    // check if _rPath is a level-1 path
			    ::rtl::OUString sNormalizedName = normalizeName(_rPath, NO_CALLER);
                if (m_xReplaceAccess->hasByName(sNormalizedName))
                {
				    m_xReplaceAccess->replaceByName(sNormalizedName, _rValue);
				    bResult = true;
                }

		    	// check if the name refers to a indirect descendant
                else if (m_xHierarchyAccess.is() && m_xHierarchyAccess->hasByHierarchicalName(_rPath))
                {
                    OSL_ASSERT(_rPath.getLength());

                    ::rtl::OUString sParentPath, sLocalName;

                    if ( splitLastFromConfigurationPath(_rPath, sParentPath, sLocalName) )
			        {
				        OConfigurationNode aParentAccess = openNode(sParentPath);
				        if (aParentAccess.isValid())
					        bResult = aParentAccess.setNodeValue(sLocalName, _rValue);
			        }
                    else
                    {
				        m_xReplaceAccess->replaceByName(sLocalName, _rValue);
                        bResult = true;
                    }
                }

			}
			catch(IllegalArgumentException&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::setNodeValue: could not replace the value: caught an IllegalArgumentException!");
			}
			catch(NoSuchElementException&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::setNodeValue: could not replace the value: caught a NoSuchElementException!");
			}
			catch(WrappedTargetException&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::setNodeValue: could not replace the value: caught a WrappedTargetException!");
			}
			catch(Exception&)
			{
				OSL_ENSURE(sal_False, "OConfigurationNode::setNodeValue: could not replace the value: caught a generic Exception!");
			}


		}
		return bResult;
	}

	//------------------------------------------------------------------------
	Any OConfigurationNode::getNodeValue(const ::rtl::OUString& _rPath) const throw()
	{
		OSL_ENSURE(m_xDirectAccess.is(), "OConfigurationNode::hasByName: object is invalid!");
		OSL_ENSURE(m_xHierarchyAccess.is(), "OConfigurationNode::hasByName: object is invalid!");
		Any aReturn;
		try
		{
			::rtl::OUString sNormalizedPath = normalizeName(_rPath, NO_CALLER);
		    if (m_xDirectAccess.is() && m_xDirectAccess->hasByName(sNormalizedPath) )
		    {
				aReturn = m_xDirectAccess->getByName(sNormalizedPath);
            }
		    else if (m_xHierarchyAccess.is())
		    {
				aReturn = m_xHierarchyAccess->getByHierarchicalName(_rPath);
		    }
		}
		catch(const NoSuchElementException&)
		{
            DBG_UNHANDLED_EXCEPTION();
		}
		return aReturn;
	}

	//------------------------------------------------------------------------
	void OConfigurationNode::clear() throw()
	{
		m_xHierarchyAccess.clear();
		m_xDirectAccess.clear();
		m_xReplaceAccess.clear();
		m_xContainerAccess.clear();
	}

	//========================================================================
	//= helper
	//========================================================================
    namespace
    {
	    //--------------------------------------------------------------------
		static const ::rtl::OUString& lcl_getProviderServiceName( )
		{
			static ::rtl::OUString s_sProviderServiceName( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.configuration.ConfigurationProvider" ) );
			return s_sProviderServiceName;
		}

	    //--------------------------------------------------------------------
        Reference< XMultiServiceFactory > lcl_getConfigProvider( const ::comphelper::ComponentContext& i_rContext )
        {
		    try
		    {
			    Reference< XMultiServiceFactory > xProvider( i_rContext.createComponent( lcl_getProviderServiceName() ), UNO_QUERY_THROW );
                return xProvider;
		    }
		    catch ( const Exception& )
		    {
                DBG_UNHANDLED_EXCEPTION();
		    }
            return NULL;
        }

	    //--------------------------------------------------------------------
        Reference< XInterface > lcl_createConfigurationRoot( const Reference< XMultiServiceFactory >& i_rxConfigProvider,
            const ::rtl::OUString& i_rNodePath, const bool i_bUpdatable, const sal_Int32 i_nDepth, const bool i_bLazyWrite )
        {
            ENSURE_OR_RETURN( i_rxConfigProvider.is(), "invalid provider", NULL );
			try
			{
                ::comphelper::NamedValueCollection aArgs;
                aArgs.put( "nodepath", i_rNodePath );
                aArgs.put( "lazywrite", i_bLazyWrite );
                aArgs.put( "depth", i_nDepth );

				::rtl::OUString sAccessService = ::rtl::OUString::createFromAscii(
                        i_bUpdatable
					? "com.sun.star.configuration.ConfigurationUpdateAccess"
					: "com.sun.star.configuration.ConfigurationAccess" );

				Reference< XInterface > xRoot(
                    i_rxConfigProvider->createInstanceWithArguments( sAccessService, aArgs.getWrappedPropertyValues() ),
                    UNO_SET_THROW
                );
				return xRoot;
			}
			catch ( const Exception& )
			{
                DBG_UNHANDLED_EXCEPTION();
			}
            return NULL;
        }
    }
	//========================================================================
	//= OConfigurationTreeRoot
	//========================================================================
	//------------------------------------------------------------------------
	OConfigurationTreeRoot::OConfigurationTreeRoot( const Reference< XChangesBatch >& _rxRootNode )
		:OConfigurationNode( _rxRootNode.get() )
		,m_xCommitter(_rxRootNode)
	{
	}

	//------------------------------------------------------------------------
	OConfigurationTreeRoot::OConfigurationTreeRoot( const Reference< XInterface >& _rxRootNode )
		:OConfigurationNode( _rxRootNode )
        ,m_xCommitter( _rxRootNode, UNO_QUERY )
	{
	}

	//------------------------------------------------------------------------
    OConfigurationTreeRoot::OConfigurationTreeRoot( const ::comphelper::ComponentContext& i_rContext, const sal_Char* i_pAsciiNodePath, const bool i_bUpdatable )
        :OConfigurationNode( lcl_createConfigurationRoot( lcl_getConfigProvider( i_rContext.getLegacyServiceFactory() ),
            ::rtl::OUString::createFromAscii( i_pAsciiNodePath ), i_bUpdatable, -1, false ).get() )
        ,m_xCommitter()
    {
        if ( i_bUpdatable )
        {
            m_xCommitter.set( getUNONode(), UNO_QUERY );
            OSL_ENSURE( m_xCommitter.is(), "OConfigurationTreeRoot::OConfigurationTreeRoot: could not create an updatable node!" );
        }
    }

	//------------------------------------------------------------------------
    OConfigurationTreeRoot::OConfigurationTreeRoot( const ::comphelper::ComponentContext& i_rContext, const ::rtl::OUString& i_rNodePath, const bool i_bUpdatable )
        :OConfigurationNode( lcl_createConfigurationRoot( lcl_getConfigProvider( i_rContext.getLegacyServiceFactory() ),
            i_rNodePath, i_bUpdatable, -1, false ).get() )
        ,m_xCommitter()
    {
        if ( i_bUpdatable )
        {
            m_xCommitter.set( getUNONode(), UNO_QUERY );
            OSL_ENSURE( m_xCommitter.is(), "OConfigurationTreeRoot::OConfigurationTreeRoot: could not create an updatable node!" );
        }
    }

	//------------------------------------------------------------------------
	void OConfigurationTreeRoot::clear() throw()
	{
		OConfigurationNode::clear();
		m_xCommitter.clear();
	}

	//------------------------------------------------------------------------
	sal_Bool OConfigurationTreeRoot::commit() const throw()
	{
		OSL_ENSURE(isValid(), "OConfigurationTreeRoot::commit: object is invalid!");
		if (!isValid())
			return sal_False;
		OSL_ENSURE(m_xCommitter.is(), "OConfigurationTreeRoot::commit: I'm a readonly node!");
		if (!m_xCommitter.is())
			return sal_False;

		try
		{
			m_xCommitter->commitChanges();
			return sal_True;
		}
		catch(const Exception&)
		{
            DBG_UNHANDLED_EXCEPTION();
		}
		return sal_False;
	}

	//------------------------------------------------------------------------
	OConfigurationTreeRoot OConfigurationTreeRoot::createWithProvider(const Reference< XMultiServiceFactory >& _rxConfProvider, const ::rtl::OUString& _rPath, sal_Int32 _nDepth, CREATION_MODE _eMode, sal_Bool _bLazyWrite)
	{
        Reference< XInterface > xRoot( lcl_createConfigurationRoot(
            _rxConfProvider, _rPath, _eMode != CM_READONLY, _nDepth, _bLazyWrite ) );
        if ( xRoot.is() )
            return OConfigurationTreeRoot( xRoot );
        return OConfigurationTreeRoot();
	}

	//------------------------------------------------------------------------
	OConfigurationTreeRoot OConfigurationTreeRoot::createWithServiceFactory( const Reference< XMultiServiceFactory >& _rxORB, const ::rtl::OUString& _rPath, sal_Int32 _nDepth, CREATION_MODE _eMode, sal_Bool _bLazyWrite )
	{
        return createWithProvider( lcl_getConfigProvider( _rxORB ), _rPath, _nDepth, _eMode, _bLazyWrite );
	}

	//------------------------------------------------------------------------
	OConfigurationTreeRoot OConfigurationTreeRoot::tryCreateWithServiceFactory( const Reference< XMultiServiceFactory >& _rxORB,
		const ::rtl::OUString& _rPath, sal_Int32 _nDepth , CREATION_MODE _eMode , sal_Bool _bLazyWrite )
	{
		OSL_ENSURE( _rxORB.is(), "OConfigurationTreeRoot::tryCreateWithServiceFactory: invalid service factory!" );
		if ( _rxORB.is() )
		{
			try
			{
				Reference< XMultiServiceFactory > xConfigFactory( _rxORB->createInstance( lcl_getProviderServiceName( ) ), UNO_QUERY );
				if ( xConfigFactory.is() )
					return createWithProvider( xConfigFactory, _rPath, _nDepth, _eMode, _bLazyWrite );
			}
			catch(const Exception&)
			{
				// silence this, 'cause the contract of this method states "no assertions"
			}
		}
		return OConfigurationTreeRoot();
	}

//........................................................................
}	// namespace utl
//........................................................................