113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/**
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* \file
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* .
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* \author
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* Nicolas Tsiftes <nvt@sics.se>
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*/
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#ifndef INDEX_H
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#define INDEX_H
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#include "relation.h"
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typedef enum {
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INDEX_NONE = 0,
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INDEX_INLINE = 1,
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INDEX_MEMHASH = 2,
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INDEX_MAXHEAP = 3
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} index_type_t;
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#define INDEX_READY 0x00
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#define INDEX_LOAD_NEEDED 0x01
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#define INDEX_LOAD_ERROR 0x02
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#define INDEX_API_INTERNAL 0x01
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#define INDEX_API_EXTERNAL 0x02
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#define INDEX_API_INLINE 0x04
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#define INDEX_API_COMPLETE 0x08
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#define INDEX_API_RANGE_QUERIES 0x10
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struct index_api;
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struct index {
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struct index *next;
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char descriptor_file[DB_MAX_FILENAME_LENGTH];
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relation_t *rel;
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attribute_t *attr;
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struct index_api *api;
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void *opaque_data;
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index_type_t type;
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uint8_t flags;
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};
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typedef struct index index_t;
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struct index_iterator {
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index_t *index;
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attribute_value_t min_value;
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attribute_value_t max_value;
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tuple_id_t next_item_no;
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tuple_id_t found_items;
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};
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typedef struct index_iterator index_iterator_t;
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struct index_api {
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index_type_t type;
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uint8_t flags;
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db_result_t (*create)(index_t *);
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db_result_t (*destroy)(index_t *);
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db_result_t (*load)(index_t *);
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db_result_t (*release)(index_t *);
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db_result_t (*insert)(index_t *, attribute_value_t *, tuple_id_t);
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db_result_t (*delete)(index_t *, attribute_value_t *);
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tuple_id_t (*get_next)(index_iterator_t *);
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};
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typedef struct index_api index_api_t;
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extern index_api_t index_inline;
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extern index_api_t index_maxheap;
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extern index_api_t index_memhash;
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void index_init(void);
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db_result_t index_create(index_type_t, relation_t *, attribute_t *);
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db_result_t index_destroy(index_t *);
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db_result_t index_load(relation_t *, attribute_t *);
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db_result_t index_release(index_t *);
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db_result_t index_insert(index_t *, attribute_value_t *, tuple_id_t);
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db_result_t index_delete(index_t *, attribute_value_t *);
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db_result_t index_get_iterator(index_iterator_t *, index_t *,
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attribute_value_t *, attribute_value_t *);
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tuple_id_t index_get_next(index_iterator_t *);
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int index_exists(attribute_t *);
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#endif /* !INDEX_H */
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