initial import

Code/DataStructs/DiscreteDistMat.cpp

@@ -0,0 +1,87 @@
+// $Id: DiscreteDistMat.cpp 4946 2006-02-17 01:44:04Z glandrum $
+//
+//  Copyright (C) 2004-2006 Rational Discovery LLC
+//
+//  @@ All Rights Reserved @@
+//
+#include "DiscreteDistMat.h"
+#include "DiscreteValueVect.h"
+#include <iostream>
+#include "DatastructsException.h"
+
+void _fillDistMat(unsigned int dmat[], unsigned int nBits) {
+  unsigned int i,j, a, b, ta, tb, dist;
+  int temp;
+  unsigned int mask = ((1<<nBits) -1);
+  for (i = 0; i < 256; ++i) {
+    for (j = 0; j < 256; ++j) {
+      dist = 0;
+      a = i;
+      b = j;
+      while (a || b) {
+        ta = a&mask;
+        tb = b&mask;
+        temp = ta-tb;
+        if (temp > 0) {
+          dist += temp;
+        } else {
+          dist -= temp;
+        }
+        a >>= nBits;
+        b >>= nBits;
+      }
+      dmat[i*256 + j] = dist;
+    }
+  }
+}
+
+DiscreteDistMat::DiscreteDistMat() {
+  // fill in the distance matrix table
+
+  // one bit per value table
+  _fillDistMat(d_oneBitTab, 1);
+
+  // two bits per value table
+  _fillDistMat(d_twoBitTab, 2);
+
+  // four bits per value table
+  _fillDistMat(d_fourBitTab, 4);
+}
+
+unsigned int DiscreteDistMat::getDist(unsigned char v1, 
+                                     unsigned char v2, 
+                                     DiscreteValueVect::DiscreteValueType type) {
+  unsigned int res=0;
+  int temp;
+  unsigned int id = static_cast<unsigned int>(v1)*256 + static_cast<unsigned int>(v2);
+  switch(type) {
+  case DiscreteValueVect::ONEBITVALUE :
+    res = d_oneBitTab[id];
+    break;
+  case DiscreteValueVect::TWOBITVALUE :
+    res = d_twoBitTab[id];
+    break;
+  case DiscreteValueVect::FOURBITVALUE :
+    res = d_fourBitTab[id];
+    break;
+  case DiscreteValueVect::EIGHTBITVALUE :
+    temp = static_cast<unsigned int>(v1) - static_cast<unsigned int>(v2);
+    if (temp < 0) {
+      res -= temp;
+    } else {
+      res += temp;
+    }
+    break;
+  default:
+    // ummm.. we shouldn't have come here
+    throw DatastructsException("We shouldn't be here");
+  }
+  return res;
+}
+
+static DiscreteDistMat discreteDMat;
+DiscreteDistMat *getDiscreteDistMat() {
+  return &discreteDMat;
+}
+
+