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diff --git a/dbaccess/source/core/api/querycontainer.cxx b/dbaccess/source/core/api/querycontainer.cxx
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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 <querycontainer.hxx>
+#include "query.hxx"
+#include <objectnameapproval.hxx>
+#include <veto.hxx>
+
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/container/XContainer.hpp>
+#include <com/sun/star/container/XContainerApproveBroadcaster.hpp>
+#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <com/sun/star/sdbc/XConnection.hpp>
+#include <com/sun/star/sdb/QueryDefinition.hpp>
+
+#include <osl/diagnose.h>
+#include <comphelper/uno3.hxx>
+#include <comphelper/property.hxx>
+#include <comphelper/types.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+
+using namespace dbtools;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::beans;
+using namespace ::com::sun::star::sdb;
+using namespace ::com::sun::star::sdbc;
+using namespace ::com::sun::star::sdbcx;
+using namespace ::com::sun::star::container;
+using namespace ::com::sun::star::util;
+using namespace ::osl;
+using namespace ::comphelper;
+using namespace ::cppu;
+
+namespace dbaccess
+{
+
+// OQueryContainer
+
+OQueryContainer::OQueryContainer(
+                  const Reference< XNameContainer >& _rxCommandDefinitions
+                , const Reference< XConnection >& _rxConn
+                , const Reference< XComponentContext >& _rxORB,
+                ::dbtools::WarningsContainer* _pWarnings)
+    :ODefinitionContainer(_rxORB,nullptr,std::make_shared<ODefinitionContainer_Impl>())
+    ,m_pWarnings( _pWarnings )
+    ,m_xCommandDefinitions(_rxCommandDefinitions)
+    ,m_xConnection(_rxConn)
+    ,m_eDoingCurrently(AggregateAction::NONE)
+{
+}
+
+void OQueryContainer::init()
+{
+    Reference< XContainer > xContainer( m_xCommandDefinitions, UNO_QUERY_THROW );
+    xContainer->addContainerListener( this );
+
+    Reference< XContainerApproveBroadcaster > xContainerApprove( m_xCommandDefinitions, UNO_QUERY_THROW );
+    xContainerApprove->addContainerApproveListener( this );
+
+    // fill my structures
+    ODefinitionContainer_Impl& rDefinitions( getDefinitions() );
+    Sequence< OUString > sDefinitionNames = m_xCommandDefinitions->getElementNames();
+    const OUString* pDefinitionName = sDefinitionNames.getConstArray();
+    const OUString* pEnd = pDefinitionName + sDefinitionNames.getLength();
+    for ( ; pDefinitionName != pEnd; ++pDefinitionName )
+    {
+        rDefinitions.insert( *pDefinitionName, TContentPtr() );
+        m_aDocuments.push_back(m_aDocumentMap.emplace( *pDefinitionName,Documents::mapped_type()).first);
+    }
+
+    setElementApproval( std::make_shared<ObjectNameApproval>( m_xConnection, ObjectNameApproval::TypeQuery ) );
+}
+
+rtl::Reference<OQueryContainer> OQueryContainer::create(
+                  const Reference< XNameContainer >& _rxCommandDefinitions
+                , const Reference< XConnection >& _rxConn
+                , const Reference< XComponentContext >& _rxORB,
+                ::dbtools::WarningsContainer* _pWarnings)
+{
+    rtl::Reference c(
+        new OQueryContainer(
+            _rxCommandDefinitions, _rxConn, _rxORB, _pWarnings));
+    c->init();
+    return c;
+}
+
+OQueryContainer::~OQueryContainer()
+{
+    //  dispose();
+        //  maybe we're already disposed, but this should be uncritical
+}
+
+IMPLEMENT_FORWARD_XINTERFACE2( OQueryContainer,ODefinitionContainer,OQueryContainer_Base)
+
+IMPLEMENT_FORWARD_XTYPEPROVIDER2( OQueryContainer,ODefinitionContainer,OQueryContainer_Base)
+
+void OQueryContainer::disposing()
+{
+    ODefinitionContainer::disposing();
+    MutexGuard aGuard(m_aMutex);
+    if ( !m_xCommandDefinitions.is() )
+        // already disposed
+        return;
+
+    Reference< XContainer > xContainer( m_xCommandDefinitions, UNO_QUERY );
+    xContainer->removeContainerListener( this );
+    Reference< XContainerApproveBroadcaster > xContainerApprove( m_xCommandDefinitions, UNO_QUERY );
+    xContainerApprove->removeContainerApproveListener( this );
+
+    m_xCommandDefinitions   = nullptr;
+    m_xConnection           = nullptr;
+}
+
+// XServiceInfo
+IMPLEMENT_SERVICE_INFO2(OQueryContainer, "com.sun.star.sdb.dbaccess.OQueryContainer", SERVICE_SDBCX_CONTAINER, SERVICE_SDB_QUERIES)
+
+// XDataDescriptorFactory
+Reference< XPropertySet > SAL_CALL OQueryContainer::createDataDescriptor(  )
+{
+    return new OQueryDescriptor();
+}
+
+// XAppend
+void SAL_CALL OQueryContainer::appendByDescriptor( const Reference< XPropertySet >& _rxDesc )
+{
+    ResettableMutexGuard aGuard(m_aMutex);
+    if ( !m_xCommandDefinitions.is() )
+        throw DisposedException( OUString(), *this );
+
+    // first clone this object's CommandDefinition part
+    Reference< css::sdb::XQueryDefinition > xCommandDefinitionPart = css::sdb::QueryDefinition::create(m_aContext);
+
+    ::comphelper::copyProperties( _rxDesc, Reference<XPropertySet>(xCommandDefinitionPart, UNO_QUERY_THROW) );
+    // TODO : the columns part of the descriptor has to be copied
+
+    // create a wrapper for the object (*before* inserting into our command definition container)
+    Reference< XContent > xNewObject( implCreateWrapper( Reference< XContent>( xCommandDefinitionPart, UNO_QUERY_THROW ) ) );
+
+    OUString sNewObjectName;
+    _rxDesc->getPropertyValue(PROPERTY_NAME) >>= sNewObjectName;
+
+    try
+    {
+        notifyByName( aGuard, sNewObjectName, xNewObject, nullptr, E_INSERTED, ApproveListeners );
+    }
+    catch (const WrappedTargetException& e)
+    {
+        disposeComponent( xNewObject );
+        disposeComponent( xCommandDefinitionPart );
+        throw WrappedTargetRuntimeException(e.Message, e.Context, e.TargetException);
+    }
+    catch (const Exception&)
+    {
+        disposeComponent( xNewObject );
+        disposeComponent( xCommandDefinitionPart );
+        throw;
+    }
+
+    // insert the basic object into the definition container
+    {
+        m_eDoingCurrently = AggregateAction::Inserting;
+        OAutoActionReset aAutoReset(*this);
+        m_xCommandDefinitions->insertByName(sNewObjectName, makeAny(xCommandDefinitionPart));
+    }
+
+    implAppend( sNewObjectName, xNewObject );
+    try
+    {
+        notifyByName( aGuard, sNewObjectName, xNewObject, nullptr, E_INSERTED, ContainerListemers );
+    }
+    catch (const WrappedTargetException& e)
+    {
+        throw WrappedTargetRuntimeException(e.Message, e.Context, e.TargetException);
+    }
+}
+
+// XDrop
+void SAL_CALL OQueryContainer::dropByName( const OUString& _rName )
+{
+    MutexGuard aGuard(m_aMutex);
+    if ( !checkExistence(_rName) )
+        throw NoSuchElementException(_rName,*this);
+
+    if ( !m_xCommandDefinitions.is() )
+        throw DisposedException( OUString(), *this );
+
+    // now simply forward the remove request to the CommandDefinition container, we're a listener for the removal
+    // and thus we do everything necessary in ::elementRemoved
+    m_xCommandDefinitions->removeByName(_rName);
+}
+
+void SAL_CALL OQueryContainer::dropByIndex( sal_Int32 _nIndex )
+{
+    MutexGuard aGuard(m_aMutex);
+    if ((_nIndex<0) || (_nIndex>getCount()))
+        throw IndexOutOfBoundsException();
+
+    if ( !m_xCommandDefinitions.is() )
+        throw DisposedException( OUString(), *this );
+
+    OUString sName;
+    Reference<XPropertySet> xProp(Reference<XIndexAccess>(m_xCommandDefinitions,UNO_QUERY_THROW)->getByIndex(_nIndex),UNO_QUERY);
+    if ( xProp.is() )
+        xProp->getPropertyValue(PROPERTY_NAME) >>= sName;
+
+    dropByName(sName);
+}
+
+void SAL_CALL OQueryContainer::elementInserted( const css::container::ContainerEvent& _rEvent )
+{
+    Reference< XContent > xNewElement;
+    OUString sElementName;
+    _rEvent.Accessor >>= sElementName;
+    {
+        MutexGuard aGuard(m_aMutex);
+        if (AggregateAction::Inserting == m_eDoingCurrently)
+            // nothing to do, we're inserting via an "appendByDescriptor"
+            return;
+
+        OSL_ENSURE(!sElementName.isEmpty(), "OQueryContainer::elementInserted : invalid name !");
+        OSL_ENSURE(m_aDocumentMap.find(sElementName) == m_aDocumentMap.end(), "OQueryContainer::elementInserted         : oops... we're inconsistent with our master container !");
+        if (sElementName.isEmpty() || hasByName(sElementName))
+            return;
+
+        // insert an own new element
+        xNewElement = implCreateWrapper(sElementName);
+    }
+    insertByName(sElementName,makeAny(xNewElement));
+}
+
+void SAL_CALL OQueryContainer::elementRemoved( const css::container::ContainerEvent& _rEvent )
+{
+    OUString sAccessor;
+    _rEvent.Accessor >>= sAccessor;
+    {
+        OSL_ENSURE(!sAccessor.isEmpty(), "OQueryContainer::elementRemoved : invalid name !");
+        OSL_ENSURE(m_aDocumentMap.find(sAccessor) != m_aDocumentMap.end(), "OQueryContainer::elementRemoved : oops... we're inconsistent with our master container !");
+        if ( sAccessor.isEmpty() || !hasByName(sAccessor) )
+            return;
+    }
+    removeByName(sAccessor);
+}
+
+void SAL_CALL OQueryContainer::elementReplaced( const css::container::ContainerEvent& _rEvent )
+{
+    Reference< XContent > xNewElement;
+    OUString sAccessor;
+    _rEvent.Accessor >>= sAccessor;
+
+    {
+        MutexGuard aGuard(m_aMutex);
+        OSL_ENSURE(!sAccessor.isEmpty(), "OQueryContainer::elementReplaced : invalid name !");
+        OSL_ENSURE(m_aDocumentMap.find(sAccessor) != m_aDocumentMap.end(), "OQueryContainer::elementReplaced         : oops... we're inconsistent with our master container !");
+        if (sAccessor.isEmpty() || !hasByName(sAccessor))
+            return;
+
+        xNewElement = implCreateWrapper(sAccessor);
+    }
+
+    replaceByName(sAccessor,makeAny(xNewElement));
+}
+
+Reference< XVeto > SAL_CALL OQueryContainer::approveInsertElement( const ContainerEvent& Event )
+{
+    OUString sName;
+    OSL_VERIFY( Event.Accessor >>= sName );
+    Reference< XContent > xElement( Event.Element, UNO_QUERY_THROW );
+
+    Reference< XVeto > xReturn;
+    try
+    {
+        getElementApproval()->approveElement( sName );
+    }
+    catch( const Exception& )
+    {
+        xReturn = new Veto( ::cppu::getCaughtException() );
+    }
+    return xReturn;
+}
+
+Reference< XVeto > SAL_CALL OQueryContainer::approveReplaceElement( const ContainerEvent& /*Event*/ )
+{
+    return nullptr;
+}
+
+Reference< XVeto > SAL_CALL OQueryContainer::approveRemoveElement( const ContainerEvent& /*Event*/ )
+{
+    return nullptr;
+}
+
+void SAL_CALL OQueryContainer::disposing( const css::lang::EventObject& _rSource )
+{
+    if (_rSource.Source.get() == Reference< XInterface >(m_xCommandDefinitions, UNO_QUERY).get())
+    {   // our "master container" (with the command definitions) is being disposed
+        OSL_FAIL("OQueryContainer::disposing : nobody should dispose the CommandDefinition container before disposing my connection !");
+        dispose();
+    }
+    else
+    {
+        Reference< XContent > xSource(_rSource.Source, UNO_QUERY);
+        // it's one of our documents...
+        for (auto const& document : m_aDocumentMap)
+        {
+            if ( xSource == document.second.get() )
+            {
+                m_xCommandDefinitions->removeByName(document.first);
+                break;
+            }
+        }
+        ODefinitionContainer::disposing(_rSource);
+    }
+}
+
+OUString OQueryContainer::determineContentType() const
+{
+    return "application/vnd.org.openoffice.DatabaseQueryContainer";
+}
+
+Reference< XContent > OQueryContainer::implCreateWrapper(const OUString& _rName)
+{
+    Reference< XContent > xObject(m_xCommandDefinitions->getByName(_rName),UNO_QUERY);
+    return implCreateWrapper(xObject);
+}
+
+Reference< XContent > OQueryContainer::implCreateWrapper(const Reference< XContent >& _rxCommandDesc)
+{
+    Reference<XNameContainer> xContainer(_rxCommandDesc,UNO_QUERY);
+    Reference< XContent > xReturn;
+    if ( xContainer .is() )
+    {
+        xReturn = create( xContainer, m_xConnection, m_aContext, m_pWarnings ).
+            get();
+    }
+    else
+    {
+        OQuery* pNewObject = new OQuery( Reference< XPropertySet >( _rxCommandDesc, UNO_QUERY ), m_xConnection, m_aContext );
+        xReturn = pNewObject;
+
+        pNewObject->setWarningsContainer( m_pWarnings );
+//      pNewObject->getColumns();
+        // Why? This is expensive. If you comment this in 'cause you really need it, be sure to run the
+        // QueryInQuery test in dbaccess/qa/complex/dbaccess ...
+    }
+
+    return xReturn;
+}
+
+Reference< XContent > OQueryContainer::createObject( const OUString& _rName)
+{
+    return implCreateWrapper(_rName);
+}
+
+bool OQueryContainer::checkExistence(const OUString& _rName)
+{
+    bool bRet = false;
+    if ( !m_bInPropertyChange )
+    {
+        bRet = m_xCommandDefinitions->hasByName(_rName);
+        Documents::const_iterator aFind = m_aDocumentMap.find(_rName);
+        if ( !bRet && aFind != m_aDocumentMap.end() )
+        {
+            m_aDocuments.erase( std::find(m_aDocuments.begin(),m_aDocuments.end(),aFind));
+            m_aDocumentMap.erase(aFind);
+        }
+        else if ( bRet && aFind == m_aDocumentMap.end() )
+        {
+            implAppend(_rName,nullptr);
+        }
+    }
+    return bRet;
+}
+
+sal_Bool SAL_CALL OQueryContainer::hasElements( )
+{
+    MutexGuard aGuard(m_aMutex);
+    return m_xCommandDefinitions->hasElements();
+}
+
+sal_Int32 SAL_CALL OQueryContainer::getCount(  )
+{
+    MutexGuard aGuard(m_aMutex);
+    return Reference<XIndexAccess>(m_xCommandDefinitions,UNO_QUERY_THROW)->getCount();
+}
+
+Sequence< OUString > SAL_CALL OQueryContainer::getElementNames(  )
+{
+    MutexGuard aGuard(m_aMutex);
+
+    return m_xCommandDefinitions->getElementNames();
+}
+
+}   // namespace dbaccess
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */