1 files changed, 134 insertions, 0 deletions
diff --git a/omegalib/omega/src/basic/ConstString.cc b/omegalib/omega/src/basic/ConstString.cc
new file mode 100644
index 0000000..7d2ec1e
--- /dev/null
+++ b/omegalib/omega/src/basic/ConstString.cc
@@ -0,0 +1,134 @@
+#include <basic/ConstString.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <string>
+#include <string.h>
+
+/* static const int CS_HashTable_Size = 1000; */
+/* static ConstStringRep *hashTable[CS_HashTable_Size] = {0}; */
+
+namespace omega {
+
+const int CS_HashTable_Size = 1000;
+class CS_HashTable {
+public:
+  ConstStringRep *p[CS_HashTable_Size];
+  CS_HashTable();
+  ~CS_HashTable();
+};
+
+namespace {
+  CS_HashTable hashTable;
+}
+
+CS_HashTable::CS_HashTable() {
+    for (int i = 0; i < CS_HashTable_Size; i++)
+      p[i] = NULL;
+  }
+
+CS_HashTable::~CS_HashTable() {
+  for (int i = 0; i < CS_HashTable_Size; i++) {
+    ConstStringRep *t = p[i];
+    while (t != NULL) {
+      ConstStringRep *tt = t->nextInBucket;
+      delete []t->name;
+      delete t;
+      t = tt;
+    }
+  }    
+}
+
+Const_String::Const_String() {
+  rep = 0;
+}
+
+void Const_String::buildRep(const char* t) {
+  int hash = 0;
+  const char *s = t;
+  while (*s != '\0') 
+    hash = hash*33 + *s++;
+  int hashBucket = hash % CS_HashTable_Size;
+  if (hashBucket < 0) hashBucket += CS_HashTable_Size;
+  assert(0 <= hashBucket && hashBucket < CS_HashTable_Size);
+  ConstStringRep **q = &(hashTable.p[hashBucket]);
+  ConstStringRep *p = *q;
+  while (p != 0) {
+    if (strcmp(p->name,t) == 0) break;
+    q = &p->nextInBucket;  
+    p = *q;
+  }
+  if (p!= 0) rep = p;
+  else {
+    rep = new ConstStringRep(t);
+    *q = rep;
+  }
+}
+
+Const_String::Const_String(const char * t) {
+  buildRep(t);
+}
+
+Const_String::Const_String(const std::string &s) {
+  buildRep(s.c_str());
+}
+
+Const_String::operator const char*() const {
+  if (!rep) return 0;
+  return rep->name;
+}
+
+Const_String::operator std::string() const {
+  if (!rep) return std::string("");
+  return std::string(rep->name);
+}
+
+int Const_String::operator++(int) {
+  return rep->count++;
+}
+
+int Const_String::operator++() {
+  return ++rep->count;
+}
+
+int Const_String:: operator--(int) {
+  return rep->count--;
+}
+
+int Const_String:: operator--() {
+  return --rep->count;
+}
+
+int operator ==(const Const_String &x, const Const_String &y) {
+  return x.rep == y.rep;
+}
+
+int operator !=(const Const_String &x, const Const_String &y) {
+  return x.rep != y.rep;
+}
+
+int operator <(const Const_String &x, const Const_String &y) {
+  return (strcmp(x.rep->name,y.rep->name) < 0);
+}
+
+int operator >(const Const_String &x, const Const_String &y) {
+  return (strcmp(x.rep->name,y.rep->name) > 0);
+}
+
+Const_String:: operator int() const {
+  return rep != 0;
+}
+
+int Const_String::null() const {
+  return rep == 0;
+}
+
+ConstStringRep:: ConstStringRep(const char *t) {
+  count = 0;
+  nextInBucket = 0;
+  char *s = new char[1+strlen(t)];
+  strcpy(s,t);
+  name = s;
+}
+
+} // namespace