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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef DRIZZLED_MY_TREE_H
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#define DRIZZLED_MY_TREE_H
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#include "drizzled/base.h" /* get 'enum ha_rkey_function' */
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#include "drizzled/qsort_cmp.h"
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#include "drizzled/memory/root.h"
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/* Worst case tree is half full. This gives use 2^(MAX_TREE_HEIGHT/2) leafs */
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static const int MAX_TREE_HEIGHT= 64;
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static const int TREE_NO_DUPS= 1;
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typedef enum { left_root_right, right_root_left } TREE_WALK;
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typedef int (*tree_walk_action)(void *,uint32_t,void *);
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typedef enum { free_init, free_free, free_end } TREE_FREE;
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typedef void (*tree_element_free)(void*, TREE_FREE, void *);
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typedef struct st_tree_element {
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struct st_tree_element *left,*right;
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colour:1; /* black is marked as 1 */
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static const int TREE_ELEMENT_EXTRA_SIZE= (sizeof(TREE_ELEMENT) + sizeof(void*));
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typedef struct st_tree {
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TREE_ELEMENT *root,null_element;
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TREE_ELEMENT **parents[MAX_TREE_HEIGHT];
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uint32_t offset_to_key, elements_in_tree, size_of_element;
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drizzled::memory::Root mem_root;
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tree_element_free free;
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/* Functions on whole tree */
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void init_tree(TREE *tree, size_t default_alloc_size, uint32_t memory_limit,
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uint32_t size, qsort_cmp2 compare, bool with_delete,
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tree_element_free free_element, void *custom_arg);
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void delete_tree(TREE*);
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void reset_tree(TREE*);
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similar to delete tree, except we do not free() blocks in mem_root
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#define is_tree_inited(tree) ((tree)->root != 0)
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/* Functions on leafs */
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TREE_ELEMENT *tree_insert(TREE *tree,void *key, uint32_t key_size,
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int tree_walk(TREE *tree,tree_walk_action action,
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void *argument, TREE_WALK visit);
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int tree_delete(TREE *tree, void *key, uint32_t key_size, void *custom_arg);
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void *tree_search_key(TREE *tree, const void *key,
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TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos,
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enum ha_rkey_function flag, void *custom_arg);
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void *tree_search_edge(TREE *tree, TREE_ELEMENT **parents,
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TREE_ELEMENT ***last_pos, int child_offs);
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void *tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs,
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ha_rows tree_record_pos(TREE *tree, const void *key,
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enum ha_rkey_function search_flag, void *custom_arg);
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#endif /* DRIZZLED_MY_TREE_H */