tdf#123293 sfx2: fix metadata loss when loading from stream

The problem is that when loading from a stream, there is no BaseURL and
also no storage for the document.

Due to the lack of BaseURL, the sfx2::createBaseURI() throws and loading
RDF metadata fails, which also pops up an annoying warning dialog.

Try to handle this in a similar way than a newly created document (see
GetDMA()), by using the vnd.sun.star.tdoc scheme URL for the document;
this however currently requires that the document has a XStorage, which
is also not the case here.

So add another UNO method to tdoc UCP's tdoc_ucp::ContentProvider,
to split out the creation of the tdoc schema URL from the creation of
the ucb Content, to get rid of the XStorage requirement.

Change-Id: Ica62743f9d21db0b1464b70db1a62ebc61989ef8
Reviewed-on: https://gerrit.libreoffice.org/67882
Tested-by: Jenkins
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

2 files changed, 29 insertions, 11 deletions

diff --git a/ucb/source/ucp/tdoc/tdoc_provider.cxx b/ucb/source/ucp/tdoc/tdoc_provider.cxx
index fef2f3145f5e..fdcfd241502c 100644
--- a/ucb/source/ucp/tdoc/tdoc_provider.cxx
+++ b/ucb/source/ucp/tdoc/tdoc_provider.cxx
@@ -88,6 +88,7 @@ css::uno::Any SAL_CALL ContentProvider::queryInterface( const css::uno::Type & r
                                                static_cast< lang::XTypeProvider* >(this),
                                                static_cast< lang::XServiceInfo* >(this),
                                                static_cast< ucb::XContentProvider* >(this),
+                                               static_cast< frame::XTransientDocumentsDocumentContentIdentifierFactory* >(this),
                                                static_cast< frame::XTransientDocumentsDocumentContentFactory* >(this)
                                                );
     return aRet.hasValue() ? aRet : OWeakObject::queryInterface( rType );
@@ -96,10 +97,11 @@ css::uno::Any SAL_CALL ContentProvider::queryInterface( const css::uno::Type & r
 // XTypeProvider methods.
 
 
-XTYPEPROVIDER_IMPL_4( ContentProvider,
+XTYPEPROVIDER_IMPL_5( ContentProvider,
                       lang::XTypeProvider,
                       lang::XServiceInfo,
                       ucb::XContentProvider,
+                      frame::XTransientDocumentsDocumentContentIdentifierFactory,
                       frame::XTransientDocumentsDocumentContentFactory );
 
 
@@ -164,13 +166,11 @@ ContentProvider::queryContent(
 }
 
 
-// XTransientDocumentsDocumentContentFactory methods.
-
+// XTransientDocumentsDocumentContentIdentifierFactory methods.
 
-// virtual
-uno::Reference< ucb::XContent > SAL_CALL
-ContentProvider::createDocumentContent(
-        const uno::Reference< frame::XModel >& Model )
+uno::Reference<ucb::XContentIdentifier> SAL_CALL
+ContentProvider::createDocumentContentIdentifier(
+        uno::Reference<frame::XModel> const& xModel)
 {
     // model -> id -> content identifier -> queryContent
     if ( !m_xDocsMgr.is() )
@@ -181,7 +181,7 @@ ContentProvider::createDocumentContent(
             1 );
      }
 
-    OUString aDocId = tdoc_ucp::OfficeDocumentsManager::queryDocumentId( Model );
+    OUString aDocId = tdoc_ucp::OfficeDocumentsManager::queryDocumentId(xModel);
     if ( aDocId.isEmpty() )
     {
         throw lang::IllegalArgumentException(
@@ -196,6 +196,17 @@ ContentProvider::createDocumentContent(
 
     uno::Reference< ucb::XContentIdentifier > xId
         = new ::ucbhelper::ContentIdentifier( aBuffer.makeStringAndClear() );
+    return xId;
+}
+
+// XTransientDocumentsDocumentContentFactory methods.
+
+uno::Reference< ucb::XContent > SAL_CALL
+ContentProvider::createDocumentContent(
+        uno::Reference<frame::XModel> const& xModel)
+{
+    uno::Reference<ucb::XContentIdentifier> const xId(
+            createDocumentContentIdentifier(xModel));
 
     osl::MutexGuard aGuard( m_aMutex );
 
diff --git a/ucb/source/ucp/tdoc/tdoc_provider.hxx b/ucb/source/ucp/tdoc/tdoc_provider.hxx
index 2f308bf3ff5c..f1dc515b1b84 100644
--- a/ucb/source/ucp/tdoc/tdoc_provider.hxx
+++ b/ucb/source/ucp/tdoc/tdoc_provider.hxx
@@ -22,6 +22,7 @@
 
 #include <rtl/ref.hxx>
 #include <com/sun/star/frame/XTransientDocumentsDocumentContentFactory.hpp>
+#include <com/sun/star/frame/XTransientDocumentsDocumentContentIdentifierFactory.hpp>
 #include <com/sun/star/packages/WrongPasswordException.hpp>
 #include <com/sun/star/lang/XSingleServiceFactory.hpp>
 #include <com/sun/star/lang/XMultiServiceFactory.hpp>
@@ -53,9 +54,10 @@ namespace tdoc_ucp {
 
 class StorageElementFactory;
 
-class ContentProvider :
-    public ::ucbhelper::ContentProviderImplHelper,
-    public css::frame::XTransientDocumentsDocumentContentFactory
+class ContentProvider
+    : public ::ucbhelper::ContentProviderImplHelper
+    , public css::frame::XTransientDocumentsDocumentContentIdentifierFactory
+    , public css::frame::XTransientDocumentsDocumentContentFactory
 {
 public:
     explicit ContentProvider( const css::uno::Reference< css::uno::XComponentContext >& rxContext );
@@ -88,6 +90,11 @@ public:
     virtual css::uno::Reference< css::ucb::XContent > SAL_CALL
     queryContent( const css::uno::Reference< css::ucb::XContentIdentifier >& Identifier ) override;
 
+    // XTransientDocumentsDocumentContentIdentifierFactory
+    virtual css::uno::Reference<css::ucb::XContentIdentifier> SAL_CALL
+    createDocumentContentIdentifier(
+        css::uno::Reference<css::frame::XModel> const& xModel) override;
+
     // XTransientDocumentsDocumentContentFactory
     virtual css::uno::Reference< css::ucb::XContent > SAL_CALL
     createDocumentContent( const css::uno::Reference<