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optimized UnlockSystem::FindSong() function so its a O(log n) operation instead of O(n)

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(improved from sequential to binary search; still may have bugs so old code is commented out)
This commit is contained in:
Andrew Wong
2003-07-09 13:54:23 +00:00
parent 059fc8e6bc
commit 402145139d
2 changed files with 43 additions and 4 deletions
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stepmania/src/UnlockSystem.cpp
+41 -4
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@@ -50,12 +50,10 @@ bool UnlockSystem::SongIsLocked( const Song *song )
p->updateLocked();
if (!p->isLocked) tmp = "un";
LOG->Trace( "UnlockSystem entry: %s", (p->m_sSongName).c_str() );
LOG->Trace( "current status: %slocked", tmp.c_str() );
}
return p && p->isLocked;
return (p != NULL) && (p->isLocked);
}
bool UnlockSystem::SongIsRoulette( const Song *song )
@@ -74,10 +72,37 @@ bool UnlockSystem::SongIsRoulette( const Song *song )
SongEntry *UnlockSystem::FindSong( const Song *pSong )
{
int left = 0;
int right = m_SongEntries.size() - 1;
CString songtitle = pSong->GetFullTranslitTitle();
songtitle.MakeUpper();
while (left != right)
{
int mid = (left + right)/2;
if (songtitle <= m_SongEntries[mid].m_sSongName )
right = mid;
else
left = mid + 1;
}
if (m_SongEntries[left].GetSong() == pSong)
{
LOG->Trace("UnlockSystem: Retrieved: %s", pSong->GetFullTranslitTitle().c_str());
return &m_SongEntries[left];
}
/*
for(unsigned i = 0; i < m_SongEntries.size(); i++)
if (m_SongEntries[i].GetSong() == pSong )
return &m_SongEntries[i];
*/
LOG->Trace("UnlockSystem: Failed to find %s", pSong->GetFullTranslitTitle().c_str());
LOG->Trace(" (landed on %s)", m_SongEntries[left].m_sSongName.c_str() );
return NULL;
}
@@ -327,3 +352,15 @@ Song *SongEntry::GetSong() const
{
return SONGMAN->FindSong( "", m_sSongName );
}
void UnlockSystem::DebugPrint()
{
for(unsigned i=0; i < m_SongEntries.size(); i++)
{
CString tmp = " ";
if (!m_SongEntries[i].isLocked) tmp = "un";
LOG->Trace( "UnlockSystem entry %d: %s",i, m_SongEntries[i].m_sSongName.c_str() );
LOG->Trace( "Status:%slocked", tmp.c_str() );
}
}