osd-contiki/apps/antelope/aql-exec.c

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/*
* Copyright (c) 2010, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Query execution functions for AQL.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#define DEBUG DEBUG_NONE
#include "net/uip-debug.h"
#include "index.h"
#include "relation.h"
#include "result.h"
#include "aql.h"
static aql_adt_t adt;
static void
clear_handle(db_handle_t *handle)
{
memset(handle, 0, sizeof(*handle));
handle->result_rel = NULL;
handle->left_rel = NULL;
handle->right_rel = NULL;
handle->join_rel = NULL;
}
static db_result_t
aql_execute(db_handle_t *handle, aql_adt_t *adt)
{
uint8_t optype;
int first_rel_arg;
db_result_t result;
relation_t *rel;
aql_attribute_t *attr;
attribute_t *relattr;
optype = AQL_GET_TYPE(adt);
if(optype == AQL_TYPE_NONE) {
/* No-ops always succeed. These can be generated by
empty lines or comments in the query language. */
return DB_OK;
}
/* If the ASSIGN flag is set, the first relation in the array is
the desired result relation. */
first_rel_arg = !!(adt->flags & AQL_FLAG_ASSIGN);
if(optype != AQL_TYPE_CREATE_RELATION &&
optype != AQL_TYPE_REMOVE_RELATION &&
optype != AQL_TYPE_JOIN) {
rel = relation_load(adt->relations[first_rel_arg]);
if(rel == NULL) {
return DB_NAME_ERROR;
}
} else {
rel = NULL;
}
result = DB_RELATIONAL_ERROR;
switch(optype) {
case AQL_TYPE_CREATE_ATTRIBUTE:
attr = &adt->attributes[0];
if(relation_attribute_add(rel, DB_STORAGE, attr->name, attr->domain,
attr->element_size) != NULL) {
result = DB_OK;
}
break;
case AQL_TYPE_CREATE_INDEX:
relattr = relation_attribute_get(rel, adt->attributes[0].name);
if(relattr == NULL) {
result = DB_NAME_ERROR;
break;
}
result = index_create(AQL_GET_INDEX_TYPE(adt), rel, relattr);
break;
case AQL_TYPE_CREATE_RELATION:
if(relation_create(adt->relations[0], DB_STORAGE) != NULL) {
result = DB_OK;
}
break;
case AQL_TYPE_REMOVE_ATTRIBUTE:
result = relation_attribute_remove(rel, adt->attributes[0].name);
break;
case AQL_TYPE_REMOVE_INDEX:
relattr = relation_attribute_get(rel, adt->attributes[0].name);
if(relattr != NULL) {
if(relattr->index != NULL) {
result = index_destroy(relattr->index);
} else {
result = DB_OK;
}
} else {
result = DB_NAME_ERROR;
}
break;
case AQL_TYPE_REMOVE_RELATION:
result = relation_remove(adt->relations[0], 1);
break;
#if DB_FEATURE_REMOVE
case AQL_TYPE_REMOVE_TUPLES:
/* Overwrite the attribute array with a full copy of the original
relation's attributes. */
adt->attribute_count = 0;
for(relattr = list_head(rel->attributes);
relattr != NULL;
relattr = relattr->next) {
AQL_ADD_ATTRIBUTE(adt, relattr->name, DOMAIN_UNSPECIFIED, 0);
}
AQL_SET_FLAG(adt, AQL_FLAG_INVERSE_LOGIC);
#endif /* DB_FEATURE_REMOVE */
case AQL_TYPE_SELECT:
if(handle == NULL) {
result = DB_ARGUMENT_ERROR;
break;
}
result = relation_select(handle, rel, adt);
break;
case AQL_TYPE_INSERT:
result = relation_insert(rel, adt->values);
break;
#if DB_FEATURE_JOIN
case AQL_TYPE_JOIN:
if(handle == NULL) {
result = DB_ARGUMENT_ERROR;
break;
}
handle->left_rel = relation_load(adt->relations[first_rel_arg]);
if(handle->left_rel == NULL) {
break;
}
handle->right_rel = relation_load(adt->relations[first_rel_arg + 1]);
if(handle->right_rel == NULL) {
relation_release(handle->left_rel);
break;
}
result = relation_join(handle, adt);
break;
#endif /* DB_FEATURE_JOIN */
default:
break;
}
if(rel != NULL) {
if(handle == NULL || !(handle->flags & DB_HANDLE_FLAG_PROCESSING)) {
relation_release(rel);
}
}
return result;
}
db_result_t
db_query(db_handle_t *handle, const char *format, ...)
{
va_list ap;
char query_string[AQL_MAX_QUERY_LENGTH];
va_start(ap, format);
vsnprintf(query_string, sizeof(query_string), format, ap);
va_end(ap);
if(handle != NULL) {
clear_handle(handle);
}
if(AQL_ERROR(aql_parse(&adt, query_string))) {
return DB_PARSING_ERROR;
}
/*aql_optimize(&adt);*/
return aql_execute(handle, &adt);
}
db_result_t
db_process(db_handle_t *handle)
{
uint8_t optype;
optype = ((aql_adt_t *)handle->adt)->optype;
switch(optype) {
#if DB_FEATURE_REMOVE
case AQL_TYPE_REMOVE_TUPLES:
return relation_process_remove(handle);
break;
#endif
case AQL_TYPE_SELECT:
return relation_process_select(handle);
break;
#if DB_FEATURE_JOIN
case AQL_TYPE_JOIN:
return relation_process_join(handle);
#endif /* DB_FEATURE_JOIN */
default:
break;
}
PRINTF("DB: Invalid operation type: %d\n", optype);
return DB_INCONSISTENCY_ERROR;
}