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/********************************************************************************
*                                                                               *
*                  S t r i n g   D i c t i o n a r y    C l a s s               *
*                                                                               *
*********************************************************************************
* Copyright (C) 1998,2006 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* This library is free software; you can redistribute it and/or                 *
* modify it under the terms of the GNU Lesser General Public                    *
* License as published by the Free Software Foundation; either                  *
* version 2.1 of the License, or (at your option) any later version.            *
*                                                                               *
* This library is distributed in the hope that it will be useful,               *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU             *
* Lesser General Public License for more details.                               *
*                                                                               *
* You should have received a copy of the GNU Lesser General Public              *
* License along with this library; if not, write to the Free Software           *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.    *
*********************************************************************************
* $Id: FXDict.h,v 1.26 2006/01/22 17:58:00 fox Exp $                            *
********************************************************************************/
#ifndef FXDICT_H
#define FXDICT_H

#ifndef FXOBJECT_H
#include "FXObject.h"
#endif

namespace FX {


/**
* The dictionary class maintains a fast-access hash table of entities
* indexed by a character string.
* It is typically used to map strings to pointers; however, overloading
* the createData() and deleteData() members allows any type of data to
* be indexed by strings.
*/
class FXAPI FXDict : public FXObject {
  FXDECLARE(FXDict)
protected:
  struct FXDictEntry {
    FXchar *key;              // Key string
    void   *data;             // Data
    FXint   hash;             // Hash value of key
    bool    mark;             // Entry is marked
    };
protected:
  FXDictEntry *dict;          // Dictionary
  FXint        total;         // Dictionary size
  FXint        number;        // Number of entries
protected:
  static FXint hash(const FXchar* str);
protected:

  /**
  * Overload this function in a derived class to return the
  * data pointer given an input pointer; the default implementation
  * just returns the input pointer.
  */
  virtual void *createData(const void*);

  /**
  * Overload this function in a derived class to delete the pointer
  * previously returned by createData(); the default implementation
  * does nothing.
  */
  virtual void deleteData(void*);
public:

  /**
  * Construct an empty dictionary.
  */
  FXDict();

  /// Copy constructor; does bit-copy of void pointer data.
  FXDict(const FXDict& orig);

  /// Assignment operator
  FXDict& operator=(const FXDict& orig);

  /**
  * Resize the table to the given size.
  */
  void size(FXint m);

  /**
  * Return the size of the table, including the empty slots.
  */
  FXint size() const { return total; }

  /**
  * Return the total number of entries in the table.
  */
  FXint no() const { return number; }

  /**
  * Insert a new entry into the table given key and mark.
  * If there is already an entry with that key, leave it unchanged,
  * otherwise insert the new entry.
  */
  void* insert(const FXchar* ky,const void* ptr,bool mrk=false);

  /**
  * Replace data at key, if the entry's mark is less than
  * or equal to the given mark.  If there was no existing entry,
  * a new entry is inserted with the given mark.
  */
  void* replace(const FXchar* ky,const void* ptr,bool mrk=false);

  /**
  * Remove data given key.
  */
  void* remove(const FXchar* ky);

  /**
  * Find data pointer given key.
  */
  void* find(const FXchar* ky) const;

  /**
  * Return true if slot is empty.
  */
  bool empty(FXint pos) const { return dict[pos].hash<0; }

  /**
  * Return key at position pos.
  */
  const FXchar* key(FXuint pos) const { return dict[pos].key; }

  /**
  * return data pointer at position pos.
  */
  void* data(FXuint pos) const { return dict[pos].data; }

  /**
  * Return mark flag of entry at position pos.
  */
  bool mark(FXuint pos) const { return dict[pos].mark; }

  /**
  * Return position of first filled slot, or >= total
  */
  FXint first() const;

  /**
  * Return position of last filled slot or -1
  */
  FXint last() const;


  /**
  * Return position of next filled slot in hash table
  * or a value greater than or equal to total if no filled
  * slot was found
  */
  FXint next(FXint pos) const;

  /**
  * Return position of previous filled slot in hash table
  * or a -1 if no filled slot was found
  */
  FXint prev(FXint pos) const;

  /// Clear all entries
  void clear();

  /// Destructor
  virtual ~FXDict();
  };

}

#endif