//method buildWaveletTree() constructs wavelet tree. It calls creation of RRR lookup table and
//adds RRR data structure to every node.
public void buildWaveletTree(ArrayList currentAlphabet, String currentLabel, WaveletNode currentNode)
{
if (currentAlphabet.Count > 2)
{
StringBuilder bitmapBuilder = new StringBuilder();
StringBuilder leftLabel = new StringBuilder();
StringBuilder rightLabel = new StringBuilder();
StringBuilder RRRbitmap = new StringBuilder();
int blockSize;
int superblockSize;
int mid = (currentAlphabet.Count + 1) / 2;
//creation of node bitmap
foreach (char c in currentLabel)
{
if (getIndex(Char.ToUpper(c), currentAlphabet) < mid)
{
bitmapBuilder.Append("0");
leftLabel.Append(Char.ToUpper(c));
}
else
{
bitmapBuilder.Append("1");
rightLabel.Append(Char.ToUpper(c));
}
}
currentNode.setBitmap(bitmapBuilder.ToString());
blockSize = (int)(Math.Log(currentNode.getBitmap().Length, 2) / 2);
if (blockSize == 0)
{
blockSize = 1;
}
superblockSize = (int)(blockSize * Math.Floor(Math.Log(currentNode.getBitmap().Length, 2)));
//creation of RRRLookupTable
currentNode.RRRTable.BlockSize = blockSize;
currentNode.RRRTable.SuperblockSize = superblockSize;
currentNode.RRRTable.ClassBitsNeeded = (int)Math.Floor(Math.Log(blockSize, 2)) + 1;
currentNode.RRRTable.buildTableG();
//filling the bitmap with additional zeroes so that every block is equal in size
if (bitmapBuilder.Length % blockSize != 0)
{
do
{
bitmapBuilder.Append("0");
} while (bitmapBuilder.Length % blockSize != 0);
}
//creation of bitmap which is being used for creation od RRR data structure
currentNode.setHelpBitmap(bitmapBuilder.ToString());
//creation od RRR Data Structure
int totalPopcount = 0;
for (int i = 0; i < currentNode.getHelpBitmap().Length; i = i + blockSize)
{
int popCount = popcount(currentNode.getHelpBitmap().Substring(i, blockSize));
RRRbitmap.Append(ToBin(popCount, currentNode.RRRTable.ClassBitsNeeded)); //spremi klasu sa potrebnim brojem bitova
RRRbitmap.Append(ToBin(currentNode.RRRTable.TableG.FirstOrDefault(t => t.Key == popCount).Value.IndexOf(currentNode.getHelpBitmap().Substring(i, blockSize)), (int)Math.Ceiling(Math.Log((GetBinCoeff(blockSize, popCount)), 2))));
totalPopcount += popCount;
if (((i + blockSize) % superblockSize) == 0 || (i + blockSize) >= currentNode.getHelpBitmap().Length)
{
currentNode.RRRStruct.superblockSums.Add(totalPopcount);
currentNode.RRRStruct.superblockOffsets.Add(RRRbitmap.Length);
}
}
currentNode.RRRStruct.Bitmap = RRRbitmap.ToString();
currentNode.setLeftChild(new WaveletNode());
currentNode.getLeftChild().setParent(currentNode);
buildWaveletTree(currentAlphabet.GetRange(0, mid), leftLabel.ToString(), currentNode.getLeftChild());
//if current alphabet has more than 3 characters, than it creates right child and calls recursion on this child
if (currentAlphabet.Count > 3)
{
currentNode.setRightChild(new WaveletNode());
currentNode.getRightChild().setParent(currentNode);
buildWaveletTree(currentAlphabet.GetRange(mid, (currentAlphabet.Count - mid)),
rightLabel.ToString(), currentNode.getRightChild());
}
}
else
{ //creation of child nodes
if (currentAlphabet.Count == 2)
{
StringBuilder bitmapBuilder = new StringBuilder();
StringBuilder RRRbitmap = new StringBuilder();
int blockSize;
int superblockSize;
foreach (char c in currentLabel)
{
if (getIndex(Char.ToUpper(c), currentAlphabet) + 1 == 1)
{
bitmapBuilder.Append("0");
}
else
{
bitmapBuilder.Append("1");
}
}
currentNode.setBitmap(bitmapBuilder.ToString());
blockSize = (int)(Math.Log(currentNode.getBitmap().Length, 2) / 2);
superblockSize = (int)(blockSize * Math.Floor(Math.Log(currentNode.getBitmap().Length, 2)));
currentNode.RRRTable.BlockSize = blockSize;
currentNode.RRRTable.SuperblockSize = superblockSize;
currentNode.RRRTable.ClassBitsNeeded = (int)Math.Floor(Math.Log(blockSize, 2)) + 1;
currentNode.RRRTable.buildTableG();
if (bitmapBuilder.Length % blockSize != 0)
{
do
{
bitmapBuilder.Append("0");
} while (bitmapBuilder.Length % blockSize != 0);
}
currentNode.setHelpBitmap(bitmapBuilder.ToString());
int totalPopcount = 0;
for (int i = 0; i < currentNode.getHelpBitmap().Length; i = i + blockSize)
{
int popCount = popcount(currentNode.getHelpBitmap().Substring(i, blockSize));
RRRbitmap.Append(ToBin(popCount, currentNode.RRRTable.ClassBitsNeeded)); //spremi klasu sa potrebnim brojem bitova
RRRbitmap.Append(ToBin(currentNode.RRRTable.TableG.FirstOrDefault(t => t.Key == popCount).Value.IndexOf(currentNode.getHelpBitmap().Substring(i, blockSize)), (int)Math.Ceiling(Math.Log((GetBinCoeff(blockSize, popCount)), 2))));
totalPopcount += popCount;
if (((i + blockSize) % superblockSize) == 0 || (i + blockSize) >= currentNode.getHelpBitmap().Length)
{
currentNode.RRRStruct.superblockSums.Add(totalPopcount);
currentNode.RRRStruct.superblockOffsets.Add(RRRbitmap.Length);
}
}
currentNode.RRRStruct.Bitmap = RRRbitmap.ToString();
}
return;
}
}