Engine directory for ticket #1

Engine/source/core/tSimpleHashTable.h

@@ -0,0 +1,115 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+// [tom, 9/19/2006] Simple hash table. Not intended to replace map<>, but it is
+// generally good enough for simple things that you don't need to iterate.
+//
+// Note: If you move this to another project, you need the updated tSparseArray.h
+// as well as hashFunction.cc/h
+
+#include "platform/platform.h"
+
+#include "core/tSparseArray.h"
+#include "core/util/hashFunction.h"
+#include "core/strings/stringFunctions.h"
+
+#ifndef _TSIMPLEHASHTABLE_H
+#define _TSIMPLEHASHTABLE_H
+
+template <class T> class SimpleHashTable : public SparseArray<T>
+{
+   typedef SparseArray<T> Parent;
+
+   bool mCaseSensitive;
+
+   char mCaseConvBuf[1024];
+   
+   // [tom, 9/21/2006] This is incredibly lame and adds a pretty big speed penalty
+   inline const char *caseConv(const char *str)
+   {
+      if(mCaseSensitive)   return str;
+
+      S32 len = dStrlen(str);
+      if(len >= sizeof(mCaseConvBuf))  len = sizeof(mCaseConvBuf) - 1;
+
+      char *dptr = mCaseConvBuf;
+      const char *sptr = str;
+      while(*sptr)
+      {
+         *dptr = dTolower(*sptr);
+         ++sptr;
+         ++dptr;
+      }
+      *dptr = 0;
+
+      return mCaseConvBuf;
+   }
+
+public:
+   SimpleHashTable(const U32 modulusSize = 64, bool caseSensitive = true) : Parent(modulusSize), mCaseSensitive(caseSensitive)
+   {
+   }
+
+   void insert(T* pObject, U8 *key, U32 keyLen);
+   T*   remove(U8 *key, U32 keyLen);
+   T*   retreive(U8 *key, U32 keyLen);
+
+   void insert(T* pObject, const char *key);
+   T*   remove(const char *key);
+   T*   retreive(const char *key);
+};
+
+template <class T> inline void SimpleHashTable<T>::insert(T* pObject, U8 *key, U32 keyLen)
+{
+   Parent::insert(pObject, Torque::hash(key, keyLen, 0));
+}
+
+template <class T> inline T* SimpleHashTable<T>::remove(U8 *key, U32 keyLen)
+{
+   return Parent::remove(Torque::hash(key, keyLen, 0));
+}
+
+template <class T> inline T* SimpleHashTable<T>::retreive(U8 *key, U32 keyLen)
+{
+   return Parent::retreive(Torque::hash(key, keyLen, 0));
+}
+
+template <class T> inline void SimpleHashTable<T>::insert(T* pObject, const char *key)
+{
+   key = caseConv(key);
+   insert(pObject, (U8 *)key, dStrlen(key));
+}
+
+template <class T> T* SimpleHashTable<T>::remove(const char *key)
+{
+   key = caseConv(key);
+   return remove((U8 *)key, dStrlen(key));
+}
+
+template <class T> T* SimpleHashTable<T>::retreive(const char *key)
+{
+   key = caseConv(key);
+   return retreive((U8 *)key, dStrlen(key));
+}
+
+
+#endif // _TSIMPLEHASHTABLE_H