/**
* rasqal_new_rowsource_from_handler:
* @query: query object
* @user_data: pointer to context information to pass in to calls
* @handler: pointer to handler methods
* @vars_table: variables table to use for rows (or NULL)
* @flags: 0 (none defined so far)
*
* Create a new rowsource over a user-defined handler.
*
* Return value: new #rasqal_rowsource object or NULL on failure
**/
rasqal_rowsource*
rasqal_new_rowsource_from_handler(rasqal_world* world,
rasqal_query* query,
void *user_data,
const rasqal_rowsource_handler *handler,
rasqal_variables_table* vars_table,
int flags)
{
rasqal_rowsource* rowsource;
if(!world || !handler)
return NULL;
if(handler->version < 1 || handler->version > 1)
return NULL;
rowsource = RASQAL_CALLOC(rasqal_rowsource*, 1, sizeof(*rowsource));
if(!rowsource) {
if(handler->finish)
handler->finish(NULL, user_data);
return NULL;
}
rowsource->usage = 1;
rowsource->world = world;
rowsource->query = query;
rowsource->user_data = (void*)user_data;
rowsource->handler = handler;
rowsource->flags = flags;
rowsource->size = 0;
rowsource->generate_group = 0;
if(vars_table)
rowsource->vars_table = rasqal_new_variables_table_from_variables_table(vars_table);
else
rowsource->vars_table = NULL;
rowsource->variables_sequence = raptor_new_sequence((raptor_data_free_handler)rasqal_free_variable,
(raptor_data_print_handler)rasqal_variable_print);
if(!rowsource->variables_sequence) {
rasqal_free_rowsource(rowsource);
return NULL;
}
if(rowsource->handler->init &&
rowsource->handler->init(rowsource, rowsource->user_data)) {
RASQAL_DEBUG2("rowsource %s init failed\n", rowsource->handler->name);
rasqal_free_rowsource(rowsource);
return NULL;
}
return rowsource;
}
/*
* rasqal_query_results_getrowsource_sparql_xml:
* @world: rasqal world object
* @iostr: #raptor_iostream to read the query results from
* @base_uri: #raptor_uri base URI of the input format
*
* Read the fourth version of the SPARQL XML query results format from an
* iostream in a format returning a rwosurce - INTERNAL.
*
* Return value: a new rasqal_rowsource or NULL on failure
**/
static rasqal_rowsource*
rasqal_query_results_get_rowsource_sparql_xml(rasqal_query_results_formatter* formatter,
rasqal_world *world,
rasqal_variables_table* vars_table,
raptor_iostream *iostr,
raptor_uri *base_uri)
{
rasqal_rowsource_sparql_xml_context* con;
con=(rasqal_rowsource_sparql_xml_context*)RASQAL_CALLOC(rasqal_rowsource_sparql_xml_context, 1, sizeof(rasqal_rowsource_sparql_xml_context));
if(!con)
return NULL;
con->world=world;
con->base_uri = base_uri ? raptor_uri_copy(base_uri) : NULL;
con->iostr=iostr;
con->locator.uri=base_uri;
con->sax2 = raptor_new_sax2(world->raptor_world_ptr, &con->locator, con);
if(!con->sax2)
return NULL;
raptor_sax2_set_start_element_handler(con->sax2,
rasqal_sparql_xml_sax2_start_element_handler);
raptor_sax2_set_characters_handler(con->sax2,
rasqal_sparql_xml_sax2_characters_handler);
raptor_sax2_set_end_element_handler(con->sax2,
rasqal_sparql_xml_sax2_end_element_handler);
con->results_sequence = raptor_new_sequence((raptor_data_free_handler)rasqal_free_row, (raptor_data_print_handler)rasqal_row_print);
con->vars_table = rasqal_new_variables_table_from_variables_table(vars_table);
return rasqal_new_rowsource_from_handler(world, NULL,
con,
&rasqal_rowsource_sparql_xml_handler,
con->vars_table,
0);
}
/**
* rasqal_new_query_results:
* @world: rasqal world object
* @query: query object (or NULL)
* @type: query results (expected) type
* @vars_table: variables table
*
* Create a new query results set
*
* The @query may be NULL for result set objects that are standalone
* and not attached to any particular query
*
* Return value: a new query result object or NULL on failure
**/
rasqal_query_results*
rasqal_new_query_results(rasqal_world* world,
rasqal_query* query,
rasqal_query_results_type type,
rasqal_variables_table* vars_table)
{
rasqal_query_results* query_results;
RASQAL_ASSERT_OBJECT_POINTER_RETURN_VALUE(world, rasqal_world, NULL);
RASQAL_ASSERT_OBJECT_POINTER_RETURN_VALUE(vars_table, rasqal_variables_table, NULL);
query_results = (rasqal_query_results*)RASQAL_CALLOC(rasqal_query_results,
1, sizeof(*query_results));
if(!query_results)
return NULL;
query_results->world = world;
query_results->type = type;
query_results->finished = 0;
query_results->executed = 0;
query_results->failed = 0;
query_results->query = query;
query_results->result_count = 0;
query_results->execution_data = NULL;
query_results->row = NULL;
query_results->ask_result = -1;
query_results->store_results = 0;
query_results->current_triple_result = -1;
/* initialize static query_results->result_triple */
raptor_statement_init(&query_results->result_triple, world->raptor_world_ptr);
query_results->triple = NULL;
query_results->results_sequence = NULL;
query_results->size = 0;
query_results->vars_table = rasqal_new_variables_table_from_variables_table(vars_table);
return query_results;
}
