writerfilter: sort RTF keywords only once in RTFTokenizer

This pushes down import time of
http://people.freedesktop.org/~vmiklos/2012/footnote-10k.rtf.xz from
10sec to 5sec on my machine.

Change-Id: I39b7e4ea59fb5c05c1d3940920950ebc47adb48b

2 files changed, 12 insertions, 4 deletions

diff --git a/writerfilter/source/rtftok/rtftokenizer.cxx b/writerfilter/source/rtftok/rtftokenizer.cxx
index b2fe78cab66b..6620e742da6f 100644
--- a/writerfilter/source/rtftok/rtftokenizer.cxx
+++ b/writerfilter/source/rtftok/rtftokenizer.cxx
@@ -42,16 +42,23 @@ using rtl::OUStringToOString;
 namespace writerfilter {
 namespace rtftok {
 
+std::vector<RTFSymbol> RTFTokenizer::m_aRTFControlWords;
+bool RTFTokenizer::m_bControlWordsSorted;
+
 RTFTokenizer::RTFTokenizer(RTFDocumentImpl& rImport, SvStream* pInStream, uno::Reference<task::XStatusIndicator> const& xStatusIndicator)
     : m_rImport(rImport),
     m_pInStream(pInStream),
     m_xStatusIndicator(xStatusIndicator),
-    m_aRTFControlWords(std::vector<RTFSymbol>(aRTFControlWords, aRTFControlWords + nRTFControlWords)),
     m_nGroup(0),
     m_nLineNumber(0),
     m_nLineStartPos(0)
 {
-    std::sort(m_aRTFControlWords.begin(), m_aRTFControlWords.end());
+    if (!RTFTokenizer::m_bControlWordsSorted)
+    {
+        RTFTokenizer::m_bControlWordsSorted = true;
+        m_aRTFControlWords = std::vector<RTFSymbol>(aRTFControlWords, aRTFControlWords + nRTFControlWords);
+        std::sort(m_aRTFControlWords.begin(), m_aRTFControlWords.end());
+    }
 }
 
 RTFTokenizer::~RTFTokenizer()
diff --git a/writerfilter/source/rtftok/rtftokenizer.hxx b/writerfilter/source/rtftok/rtftokenizer.hxx
index 94cbe402e857..c717faab45eb 100644
--- a/writerfilter/source/rtftok/rtftokenizer.hxx
+++ b/writerfilter/source/rtftok/rtftokenizer.hxx
@@ -58,8 +58,9 @@ namespace writerfilter {
                 RTFDocumentImpl& m_rImport;
                 SvStream* m_pInStream;
                 uno::Reference<task::XStatusIndicator> const& m_xStatusIndicator;
-                // This is the same as m_aRTFControlWords, but sorted
-                std::vector<RTFSymbol> m_aRTFControlWords;
+                // This is the same as aRTFControlWords, but sorted
+                static std::vector<RTFSymbol> m_aRTFControlWords;
+                static bool m_bControlWordsSorted;
                 /// Same as the size of the importer's states, except that this can be negative for invalid input.
                 int m_nGroup;
                 sal_Int32 m_nLineNumber;