Fl_Preferences.H

//
// "$Id: Fl_Preferences.H 7949 2010-12-05 00:38:16Z greg.ercolano $"
//
// Preferences .
//
// Copyright 2002-2010 by Matthias Melcher.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library 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.
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//
 
/* \file
   Fl_Preferences class . */
 
#ifndef Fl_Preferences_H
#  define Fl_Preferences_H
 
#  include <stdio.h>
#  include "Fl_Export.H" 

class FL_EXPORT Fl_Preferences {
 
public: 
  enum Root { 
    SYSTEM=0,   
    USER        
  };
  
  typedef void *ID;
  
  static const char *newUUID();
 
  Fl_Preferences( Root root, const char *vendor, const char *application );
  Fl_Preferences( const char *path, const char *vendor, const char *application );
  Fl_Preferences( Fl_Preferences &parent, const char *group );
  Fl_Preferences( Fl_Preferences *parent, const char *group );
  Fl_Preferences( Fl_Preferences &parent, int groupIndex );
  Fl_Preferences( Fl_Preferences *parent, int groupIndex );
  Fl_Preferences(const Fl_Preferences&);
  Fl_Preferences( ID id );
  virtual ~Fl_Preferences();
  
  ID id() { return (ID)node; }
  
  static char remove(ID id_) { return ((Node*)id_)->remove(); }

  const char *name() { return node->name(); }
  
  const char *path() { return node->path(); }
  
  int groups();
  const char *group( int num_group );
  char groupExists( const char *key );
  char deleteGroup( const char *group );
  char deleteAllGroups();
 
  int entries();
  const char *entry( int index );
  char entryExists( const char *key );
  char deleteEntry( const char *entry );
  char deleteAllEntries();
  
  char clear();
 
  char set( const char *entry, int value );
  char set( const char *entry, float value );
  char set( const char *entry, float value, int precision );
  char set( const char *entry, double value );
  char set( const char *entry, double value, int precision );
  char set( const char *entry, const char *value );
  char set( const char *entry, const void *value, int size ); 
  
  char get( const char *entry, int &value, int defaultValue );
  char get( const char *entry, float &value,  float defaultValue );
  char get( const char *entry, double &value, double defaultValue );
  char get( const char *entry, char *&value,  const char *defaultValue );
  char get( const char *entry, char *value,   const char *defaultValue, int maxSize );
  char get( const char *entry, void *&value,  const void *defaultValue, int defaultSize );
  char get( const char *entry, void *value,   const void *defaultValue, int defaultSize, int maxSize );
 
  int size( const char *entry );
 
  char getUserdataPath( char *path, int pathlen );
 
  void flush();
 
  // char export( const char *filename, Type fileFormat );
  // char import( const char *filename );
  
  class FL_EXPORT Name {
 
    char *data_;
 
  public: 
    Name( unsigned int n );
    Name( const char *format, ... );

    operator const char *() { return data_; }
    ~Name();
  };

  struct Entry {
    char *name, *value;
  };
 
private: 
  Fl_Preferences() : node(0), rootNode(0) { }
  Fl_Preferences &operator=(const Fl_Preferences&);
 
  static char nameBuffer[128];
  static char uuidBuffer[40];
  static Fl_Preferences *runtimePrefs;
 
  class RootNode;
  
  class FL_EXPORT Node {        // a node contains a list to all its entries 
                                // and all means to manage the tree structure
    Node *child_, *next_;
    union {                     // these two are mutually exclusive
      Node *parent_;            // top_ bit clear
      RootNode *root_;          // top_ bit set
    };
    char *path_;
    Entry *entry_;
    int nEntry_, NEntry_;
    unsigned char dirty_:1;
    unsigned char top_:1;
    unsigned char indexed_:1;
    // indexing routines
    Node **index_;
    int nIndex_, NIndex_;
    void createIndex();
    void updateIndex();
    void deleteIndex();
  public:
    static int lastEntrySet;
  public:
    Node( const char *path );
    ~Node();
    // node methods
    int write( FILE *f );
    const char *name();
    const char *path() { return path_; }
    Node *find( const char *path );
    Node *search( const char *path, int offset=0 );
    Node *childNode( int ix );
    Node *addChild( const char *path );
    void setParent( Node *parent );
    Node *parent() { return top_?0L:parent_; }
    void setRoot(RootNode *r) { root_ = r; top_ = 1; }
    RootNode *findRoot();
    char remove();
    char dirty();
    void deleteAllChildren();
    // entry methods
    int nChildren();
    const char *child( int ix );
    void set( const char *name, const char *value );
    void set( const char *line );
    void add( const char *line );
    const char *get( const char *name );
    int getEntry( const char *name );
    char deleteEntry( const char *name );
    void deleteAllEntries();
    int nEntry() { return nEntry_; }
    Entry &entry(int i) { return entry_[i]; }
  };
  friend class Node;
 
  class FL_EXPORT RootNode {            // the root node manages file paths and basic reading and writing
    Fl_Preferences *prefs_;
    char *filename_;
    char *vendor_, *application_;
  public:
    RootNode( Fl_Preferences *, Root root, const char *vendor, const char *application );
    RootNode( Fl_Preferences *, const char *path, const char *vendor, const char *application );
    RootNode( Fl_Preferences * );
    ~RootNode();
    int read();
    int write();
    char getPath( char *path, int pathlen );
  };
  friend class RootNode;
 
protected:
  Node *node;
  RootNode *rootNode;
};
 
#endif // !Fl_Preferences_H
 
//
// End of "$Id: Fl_Preferences.H 7949 2010-12-05 00:38:16Z greg.ercolano $".
//