Power-Programmierung/CD2.mdf/c/library/mslang/isam/include/indexmgr.h

C/C++ Source or Header | 1994-02-08 | 1.5 KB | 56 lines

// INDEXMGR.H - IndexMgr Class Header

#ifndef INDEXMGR_H
#define INDEXMGR_H

#include "filemgr.h"
#include "nodemgr.h"

const idxRecSize = 1022;

class IndexMgr : public FileMgr
    {

private:

    int item_size; // Size of index item (excludes pointer)
    long head_ptr_pos; // Position in file of head of tree pointer
    long left_ptr_pos; // Leftmost node pointer position
    long head_node; // Head node
    long left_node; // Left node
    long parent[32]; // Parent nodes
    int depth; // Depth of current node
    int idx_created; // Set if index was created this go
    int is_unique; // True if unique index
    NodeMgr *node;

    virtual void read_data(void *block); // Virtual read function
    virtual void write_data(void *block); // Virtual write finction

    virtual void create_file(void) { create_idx(); }

    long find_rec(void *contents, long recno); // Tree walker function
public:

    IndexMgr(const char *fname, int itsize, int unique);
    IndexMgr(const char *fname, int itsize, int unique, int file_des,
             int idxno, int create);
    ~IndexMgr(void);
    void create_idx(void);

    int get_fd(void) { return fd; }
    void set_fd(int file_des) { fd = file_des; }
    long find(void *contents);
    long retrieve(void);
    long next(int no_recs);
    long prev(int no_recs);
    void rew(void);
    int compare(void *contents);
    int insert(long recno, void *contents);
    int erase(void);
    void node_split(void);
    int created_idx(void) { return idx_created; }
    };

#endif