tdf#125254 Performance: A spreadsheet opens too slow, NameSpaceEntry

NameSpaceEntry does not need to be a weak object, it is sufficient
to be ref-counted.

The empty string in SvXMLNamespaceMap can be statically allocated.

Don't allocate a NameSpaceEntry in GetKeyByAttrName_ if we don't
intend to cache it.

Takes the load time from 39.5s to 38.5s.

Change-Id: I4a9a1296af84c12d44e9b3ff354297f37d29f1e8
Reviewed-on: https://gerrit.libreoffice.org/72515
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/xmloff/nmspmap.hxx

@@ -30,7 +30,7 @@
 #include <sal/types.h>
 #include <rtl/ustring.hxx>
 #include <rtl/ref.hxx>
-#include <cppuhelper/weak.hxx>
+#include <salhelper/simplereferenceobject.hxx>
 
 #include <limits.h>
 
@@ -39,7 +39,7 @@ const sal_uInt16 XML_NAMESPACE_NONE          = USHRT_MAX-1;
 const sal_uInt16 XML_NAMESPACE_UNKNOWN       = USHRT_MAX;
 const sal_uInt16 XML_NAMESPACE_UNKNOWN_FLAG  = 0x8000;
 
-class NameSpaceEntry : public cppu::OWeakObject
+class NameSpaceEntry : public salhelper::SimpleReferenceObject
 {
 public:
     // sName refers to the full namespace name
@@ -47,7 +47,7 @@ public:
     // sPrefix is the prefix used to declare a given item to be from a given namespace
     OUString     sPrefix;
     // nKey is the unique identifier of a namespace
-    sal_uInt16          nKey;
+    sal_uInt16   nKey;
 };
 
 typedef ::std::pair < sal_uInt16, OUString > QNamePair;
@@ -65,12 +65,11 @@ struct QNamePairHash
 
 typedef std::unordered_map < QNamePair, OUString, QNamePairHash > QNameCache;
 typedef std::unordered_map < OUString, ::rtl::Reference <NameSpaceEntry > > NameSpaceHash;
-typedef std::map < sal_uInt16, ::rtl::Reference < NameSpaceEntry > > NameSpaceMap;
+typedef std::unordered_map < sal_uInt16, ::rtl::Reference < NameSpaceEntry > > NameSpaceMap;
 
 class XMLOFF_DLLPUBLIC SvXMLNamespaceMap
 {
-    const OUString       sXMLNS;
-    const OUString       sEmpty;
+    OUString                    sXMLNS;
 
     NameSpaceHash               aNameHash;
     mutable NameSpaceHash       aNameCache;

xmloff/source/core/nmspmap.cxx

@@ -46,6 +46,8 @@ using namespace ::xmloff::token;
  * Martin 13/06/01
  */
 
+static const OUString sEmpty;
+
 SvXMLNamespaceMap::SvXMLNamespaceMap()
 : sXMLNS( GetXMLToken ( XML_XMLNS ) )
 {
@@ -302,47 +304,50 @@ sal_uInt16 SvXMLNamespaceMap::GetKeyByAttrName_( const OUString& rAttrName,
     }
     else
     {
-        rtl::Reference<NameSpaceEntry> xEntry(new NameSpaceEntry);
+        OUString sEntryPrefix, sEntryName;
 
         sal_Int32 nColonPos = rAttrName.indexOf( ':' );
         if( -1 == nColonPos )
         {
             // case: no ':' found -> default namespace
-            xEntry->sPrefix.clear();
-            xEntry->sName = rAttrName;
+            sEntryName = rAttrName;
         }
         else
         {
             // normal case: ':' found -> get prefix/suffix
-            xEntry->sPrefix = rAttrName.copy( 0L, nColonPos );
-            xEntry->sName = rAttrName.copy( nColonPos + 1 );
+            sEntryPrefix = rAttrName.copy( 0L, nColonPos );
+            sEntryName = rAttrName.copy( nColonPos + 1 );
         }
 
         if( pPrefix )
-            *pPrefix = xEntry->sPrefix;
+            *pPrefix = sEntryPrefix;
         if( pLocalName )
-            *pLocalName = xEntry->sName;
+            *pLocalName = sEntryName;
 
-        NameSpaceHash::const_iterator aIter = aNameHash.find( xEntry->sPrefix );
+        NameSpaceHash::const_iterator aIter = aNameHash.find( sEntryPrefix );
         if ( aIter != aNameHash.end() )
         {
             // found: retrieve namespace key
-            nKey = xEntry->nKey = (*aIter).second->nKey;
+            nKey = (*aIter).second->nKey;
             if ( pNamespace )
                 *pNamespace = (*aIter).second->sName;
         }
-        else if ( xEntry->sPrefix == sXMLNS )
+        else if ( sEntryPrefix == sXMLNS )
             // not found, but xmlns prefix: return xmlns 'namespace'
-            nKey = xEntry->nKey = XML_NAMESPACE_XMLNS;
+            nKey = XML_NAMESPACE_XMLNS;
         else if( nColonPos == -1 )
             // not found, and no namespace: 'namespace' none
-            nKey = xEntry->nKey = XML_NAMESPACE_NONE;
+            nKey = XML_NAMESPACE_NONE;
         else
-            nKey = xEntry->nKey = XML_NAMESPACE_UNKNOWN;
+            nKey = XML_NAMESPACE_UNKNOWN;
 
         if (bCache)
         {
-            aNameCache.emplace(rAttrName, xEntry);
+            rtl::Reference<NameSpaceEntry> xEntry(new NameSpaceEntry);
+            xEntry->sPrefix = std::move(sEntryPrefix);
+            xEntry->sName = std::move(sEntryName);
+            xEntry->nKey = std::move(nKey);
+            aNameCache.emplace(rAttrName, std::move(xEntry));
         }
     }