fdo#51239 refresh row lazily (when data is requested)

This avoids fetching data that will not be requested when the "cursor"
is only moved and no data requested. That is typically what
RowSetCache does when its own cursor is moved within its window.

This basically makes the whole {next,previous,absolute,...}_checked
story obsolete, by basically always being as fast as the
i_bFetchRow==false case, but in a safer way.

Change-Id: I89eaf277069736b3077bde8b45325929db290f2d

Signed-off-by: Petr Mladek <pmladek@suse.cz>

2 files changed, 44 insertions, 39 deletions

diff --git a/dbaccess/source/core/api/KeySet.cxx b/dbaccess/source/core/api/KeySet.cxx
index 6dd839054e60..baed229ce61b 100644
--- a/dbaccess/source/core/api/KeySet.cxx
+++ b/dbaccess/source/core/api/KeySet.cxx
@@ -392,8 +392,7 @@ sal_Bool SAL_CALL OKeySet::moveToBookmark( const Any& bookmark ) throw(SQLExcept
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::moveToBookmark" );
     m_bInserted = m_bUpdated = m_bDeleted = sal_False;
     m_aKeyIter = m_aKeyMap.find(::comphelper::getINT32(bookmark));
-    if (m_aKeyIter != m_aKeyMap.end())
-        refreshRow();
+    invalidateRow();
     return m_aKeyIter != m_aKeyMap.end();
 }
 
@@ -1134,7 +1133,7 @@ sal_Bool SAL_CALL OKeySet::next(  ) throw(SQLException, RuntimeException)
         }
     }
 
-    refreshRow();
+    invalidateRow();
     return !isAfterLast();
 }
 
@@ -1201,7 +1200,7 @@ sal_Bool SAL_CALL OKeySet::first(  ) throw(SQLException, RuntimeException)
         }
     }
     else
-        refreshRow();
+        invalidateRow();
     return m_aKeyIter != m_aKeyMap.end() && m_aKeyIter != m_aKeyMap.begin();
 }
 
@@ -1210,7 +1209,7 @@ sal_Bool SAL_CALL OKeySet::last(  ) throw(SQLException, RuntimeException)
     return last_checked(sal_True);
 }
 
-sal_Bool OKeySet::last_checked( sal_Bool i_bFetchRow)
+sal_Bool OKeySet::last_checked( sal_Bool /* i_bFetchRow */ )
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::last_checked" );
     m_bInserted = m_bUpdated = m_bDeleted = sal_False;
@@ -1220,10 +1219,7 @@ sal_Bool OKeySet::last_checked( sal_Bool i_bFetchRow)
     --m_aKeyIter;
     if ( !fetchedRow )
     {
-        if ( i_bFetchRow )
-            refreshRow();
-        else
-            invalidateRow();
+        invalidateRow();
     }
     return m_aKeyIter != m_aKeyMap.end() && m_aKeyIter != m_aKeyMap.begin();
 }
@@ -1241,7 +1237,7 @@ sal_Bool SAL_CALL OKeySet::absolute( sal_Int32 row ) throw(SQLException, Runtime
 {
     return absolute_checked(row,sal_True);
 }
-sal_Bool OKeySet::absolute_checked( sal_Int32 row,sal_Bool i_bFetchRow )
+sal_Bool OKeySet::absolute_checked( sal_Int32 row, sal_Bool /* i_bFetchRow */ )
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::absolute" );
     m_bInserted = m_bUpdated = m_bDeleted = sal_False;
@@ -1295,10 +1291,7 @@ sal_Bool OKeySet::absolute_checked( sal_Int32 row,sal_Bool i_bFetchRow )
     }
     if ( !fetchedRow )
     {
-        if ( i_bFetchRow )
-            refreshRow();
-        else
-            invalidateRow();
+        invalidateRow();
     }
 
     return m_aKeyIter != m_aKeyMap.end() && m_aKeyIter != m_aKeyMap.begin();
@@ -1309,23 +1302,20 @@ sal_Bool SAL_CALL OKeySet::relative( sal_Int32 rows ) throw(SQLException, Runtim
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::relative" );
     if(!rows)
     {
-        refreshRow();
+        invalidateRow();
         return sal_True;
     }
     return absolute(getRow()+rows);
 }
 
-sal_Bool OKeySet::previous_checked( sal_Bool i_bFetchRow )
+sal_Bool OKeySet::previous_checked( sal_Bool /* i_bFetchRow */ )
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::previous" );
     m_bInserted = m_bUpdated = m_bDeleted = sal_False;
     if(m_aKeyIter != m_aKeyMap.begin())
     {
         --m_aKeyIter;
-        if ( i_bFetchRow )
-            refreshRow();
-        else
-            invalidateRow();
+        invalidateRow();
     }
     return m_aKeyIter != m_aKeyMap.begin();
 }
@@ -1503,139 +1493,153 @@ bool OKeySet::fillAllRows()
 sal_Bool SAL_CALL OKeySet::wasNull(  ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::wasNull" );
+    if ( ! m_xRow.is() )
+        throwGenericSQLException(::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("Must call getFOO() for some FOO before wasNull()")), *this);
+
+    OSL_ENSURE(m_xRow.is(),"m_xRow is null! I've thrown, but function execution continued?");
     return m_xRow->wasNull();
 }
 
+inline void OKeySet::ensureRowForData( ) throw(SQLException, RuntimeException)
+{
+    if (! m_xRow.is() )
+        refreshRow();
+    if (! m_xRow.is() )
+        throwSQLException("Failed to refetch row", "02000", *this, -2);
+
+    OSL_ENSURE(m_xRow.is(),"m_xRow is null! I've called throwSQLException but execution continued?");
+}
+
 ::rtl::OUString SAL_CALL OKeySet::getString( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getString" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getString(columnIndex);
 }
 
 sal_Bool SAL_CALL OKeySet::getBoolean( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getBoolean" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getBoolean(columnIndex);
 }
 
 sal_Int8 SAL_CALL OKeySet::getByte( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getByte" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getByte(columnIndex);
 }
 
 sal_Int16 SAL_CALL OKeySet::getShort( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getShort" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getShort(columnIndex);
 }
 
 sal_Int32 SAL_CALL OKeySet::getInt( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getInt" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getInt(columnIndex);
 }
 
 sal_Int64 SAL_CALL OKeySet::getLong( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getLong" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getLong(columnIndex);
 }
 
 float SAL_CALL OKeySet::getFloat( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getFloat" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getFloat(columnIndex);
 }
 
 double SAL_CALL OKeySet::getDouble( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getDouble" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getDouble(columnIndex);
 }
 
 Sequence< sal_Int8 > SAL_CALL OKeySet::getBytes( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getBytes" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getBytes(columnIndex);
 }
 
 ::com::sun::star::util::Date SAL_CALL OKeySet::getDate( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getDate" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getDate(columnIndex);
 }
 
 ::com::sun::star::util::Time SAL_CALL OKeySet::getTime( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getTime" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getTime(columnIndex);
 }
 
 ::com::sun::star::util::DateTime SAL_CALL OKeySet::getTimestamp( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getTimestamp" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getTimestamp(columnIndex);
 }
 
 Reference< ::com::sun::star::io::XInputStream > SAL_CALL OKeySet::getBinaryStream( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getBinaryStream" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getBinaryStream(columnIndex);
 }
 
 Reference< ::com::sun::star::io::XInputStream > SAL_CALL OKeySet::getCharacterStream( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getCharacterStream" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getCharacterStream(columnIndex);
 }
 
 Any SAL_CALL OKeySet::getObject( sal_Int32 columnIndex, const Reference< ::com::sun::star::container::XNameAccess >& typeMap ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getObject" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getObject(columnIndex,typeMap);
 }
 
 Reference< XRef > SAL_CALL OKeySet::getRef( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getRef" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getRef(columnIndex);
 }
 
 Reference< XBlob > SAL_CALL OKeySet::getBlob( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getBlob" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getBlob(columnIndex);
 }
 
 Reference< XClob > SAL_CALL OKeySet::getClob( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getClob" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getClob(columnIndex);
 }
 
 Reference< XArray > SAL_CALL OKeySet::getArray( sal_Int32 columnIndex ) throw(SQLException, RuntimeException)
 {
     RTL_LOGFILE_CONTEXT_AUTHOR( aLogger, "dbaccess", "Ocke.Janssen@sun.com", "OKeySet::getArray" );
-    OSL_ENSURE(m_xRow.is(),"m_xRow is null!");
+    ensureRowForData();
     return m_xRow->getArray(columnIndex);
 }
 
diff --git a/dbaccess/source/core/api/KeySet.hxx b/dbaccess/source/core/api/KeySet.hxx
index b98086dbb625..35b2b9b27d3e 100644
--- a/dbaccess/source/core/api/KeySet.hxx
+++ b/dbaccess/source/core/api/KeySet.hxx
@@ -210,6 +210,7 @@ namespace dbaccess
         virtual sal_Bool SAL_CALL absolute( sal_Int32 row ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
         virtual sal_Bool SAL_CALL relative( sal_Int32 rows ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
         virtual sal_Bool SAL_CALL previous(  ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
+        virtual void SAL_CALL ensureRowForData(  ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
         virtual void SAL_CALL refreshRow(  ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
         // ::com::sun::star::sdbcx::XRowLocate
         virtual ::com::sun::star::uno::Any SAL_CALL getBookmark() throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);