SbName.h

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/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Nick Thompson (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (oct 2011)
**=======================================================================*/
 
#ifndef _SB_NAME_
#define _SB_NAME_
 
#ifndef HIDDEN_FROM_DOC
 
#include <Inventor/SbString.h>
 
//
//  Class: SbNameEntry (internal to SB)
//
//  This is used to make lists of SbName instances.
//
 
 
// The size of a chunk is about a page (4K) minus room for other stuff
// in the structure
 
{
public:
 
  // Inserts string in table
  static const char* insert(const char *s);
 
  // Removes string from table
  static SbBool remove(const char *s);
 
  // Initializes/Unload SbNameEntry class
  static void initClass();
  static void exitClass();
 
  struct SbNameEntry
  {
    SbNameEntry* next;            // Pointer to next entry
    uint32_t hashValue;           // Its hash value
    
    struct SbNameEntryUsage
    {
      uint32_t _isStrDup : 1;     // String allocated in chunk (0) or elsewhere (1)
      uint32_t _refCount : 31;    // Place for ref counting names
    } usage;
 
    union SbNameEntryString       // Data depends on _isStrDup
    {
      char _const;          // _isStrDup == 0 : this is the string.
      char* _ptr;                 // _isStrDup == 1 : this is a pointer to the string.
    } nameString;
 
    const char* getString() const // Access to the string.
    {
      if (usage._isStrDup)
        return nameString._ptr;
      return (const char*)&(nameString._const);
    }
  };
 
private:
  SbNameChunk();
  ~SbNameChunk();
 
  char* mem;         // Chunk o'memory
  char* curByte;     // Current byte of chunk
  size_t bytesLeft;  // Bytes left in chunk
  SbNameChunk* next; // Pointer to next chunk
  
  static int nameTableSize;               // Number of buckets in name table
  static SbNameEntry** nameTable; // Array of name entries
  static SbNameChunk* chunk;              // Chunk of memory for string storage
  static int chunkSize;
 
  static SbNameEntry*& findEntry(const char *s); // Finds string entry in table
};
 
#endif // HIDDEN_FROM_DOC
 
//
//  Class: SbName
//
//  An SbName is a character string that is stored in a special table.
//  When a string is stored in this table, a pointer to the storage is
//  returned. Two identical strings will return the same pointer. This
//  means that comparison of two SbNames for equality can be
//  accomplished by comparing their pointers!
//
 
 
class  SbName
{
 public:
  SbName() { string = SbNameChunk::insert(""); }
 
  SbName(const char *s) { string = SbNameChunk::insert(s); }
 
  SbName(const SbString &s) { string = SbNameChunk::insert(s.toLatin1()); }
 
  SbName(const SbName &n) { string = n.string; }
 
  ~SbName() {};
 
  const char* getString() const
  {
    return string;
  }
 
  int getLength() const
  {
    return static_cast<int>(strlen(string));
  }
 
  static SbBool isIdentStartChar(char c);
 
  static SbBool isIdentChar(char c);
 
  static SbBool isBaseNameStartChar(char c);
 
  static SbBool isBaseNameChar(char c);
 
  int operator !() const
  {
    return ( string[0] == '\0');
  }
 
   friend int operator ==(const SbName &n, const char *s)
  {
    return (n.string[0] == s[0] && ! strcmp(n.string, s));
  }
 
   friend int operator ==(const char *s, const SbName &n)
  {
    return (n.string[0] == s[0] && ! strcmp(n.string, s));
  }
 
   friend int operator ==(const SbName &n1, const SbName &n2)
  {
    return (n1.string[0] == n2.string[0] && ! strcmp(n1.string, n2.string));
  }
 
   friend int operator !=(const SbName &n, const char *s)
  {
    return ! (n.string[0] == s[0] && ! strcmp(n.string, s));
  }
 
   friend int operator !=(const char *s, const SbName &n)
  { return ! (n.string[0] == s[0] && ! strcmp(n.string, s)); }
 
   friend int operator !=(const SbName &n1, const SbName &n2)
  { return ! (n1.string[0] == n2.string[0] && ! strcmp(n1.string, n2.string)); }
 
   friend bool operator < (const SbName &n1, const SbName &n2)
  {
    return (strcmp(n1.string, n2.string) < 0);
  }
 
   friend std::ostream& operator << (std::ostream& os, const SbName& n)
  {
    return os << n.getString();
  }
 
private:
  static void enableUseNameCompat( const SbBool enable )
  { s_useNameCompat = enable; }
 
  static SbBool useNameCompat()
  { return s_useNameCompat; }
 
 private:
  // Name string storage
  const char* string;
 
  // Flag to control use of valid names
  static SbBool s_useNameCompat;
};
 
#endif // _SB_NAME_