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#include "search.h"
#include "symbol.h"
#include <string.h>
#include "internal.h"
/***************************************************************************
*
* Filter
*
***************************************************************************/
void filt_destroy_i(Filter *filt)
{
h_destroy(filt->cache);
free(filt);
}
void filt_deref(Filter *filt)
{
if (--(filt->ref_cnt) == 0) {
filt->destroy_i(filt);
}
}
BitVector *filt_get_bv(Filter *filt, IndexReader *ir)
{
CacheObject *co = (CacheObject *)h_get(filt->cache, ir);
if (!co) {
BitVector *bv;
if (!ir->cache) {
ir_add_cache(ir);
}
bv = filt->get_bv_i(filt, ir);
co = co_create(filt->cache, ir->cache, filt, ir,
(free_ft)&bv_destroy, (void *)bv);
}
return (BitVector *)co->obj;
}
static char *filt_to_s_i(Filter *filt)
{
return estrdup(S(filt->name));
}
static unsigned long filt_hash_default(Filter *filt)
{
(void)filt;
return 0;
}
static int filt_eq_default(Filter *filt, Filter *o)
{
(void)filt; (void)o;
return false;
}
Filter *filt_create(size_t size, Symbol name)
{
Filter *filt = (Filter *)emalloc(size);
filt->cache = co_hash_create();
filt->name = name;
filt->to_s = &filt_to_s_i;
filt->hash = &filt_hash_default;
filt->eq = &filt_eq_default;
filt->destroy_i = &filt_destroy_i;
filt->ref_cnt = 1;
return filt;
}
unsigned long filt_hash(Filter *filt)
{
return sym_hash(filt->name) ^ filt->hash(filt);
}
int filt_eq(Filter *filt, Filter *o)
{
return ((filt == o)
|| ((filt->name == o->name)
&& (filt->eq == o->eq)
&& (filt->eq(filt, o))));
}
/***************************************************************************
*
* QueryFilter
*
***************************************************************************/
#define QF(filt) ((QueryFilter *)(filt))
typedef struct QueryFilter
{
Filter super;
Query *query;
} QueryFilter;
static char *qfilt_to_s(Filter *filt)
{
Query *query = QF(filt)->query;
char *query_str = query->to_s(query, NULL);
char *filter_str = strfmt("QueryFilter< %s >", query_str);
free(query_str);
return filter_str;
}
static BitVector *qfilt_get_bv_i(Filter *filt, IndexReader *ir)
{
BitVector *bv = bv_new_capa(ir->max_doc(ir));
Searcher *sea = isea_new(ir);
Weight *weight = q_weight(QF(filt)->query, sea);
Scorer *scorer = weight->scorer(weight, ir);
if (scorer) {
while (scorer->next(scorer)) {
bv_set(bv, scorer->doc);
}
scorer->destroy(scorer);
}
weight->destroy(weight);
free(sea);
return bv;
}
static unsigned long qfilt_hash(Filter *filt)
{
return q_hash(QF(filt)->query);
}
static int qfilt_eq(Filter *filt, Filter *o)
{
return q_eq(QF(filt)->query, QF(o)->query);
}
static void qfilt_destroy_i(Filter *filt)
{
Query *query = QF(filt)->query;
q_deref(query);
filt_destroy_i(filt);
}
Filter *qfilt_new_nr(Query *query)
{
Filter *filt = filt_new(QueryFilter);
QF(filt)->query = query;
filt->get_bv_i = &qfilt_get_bv_i;
filt->hash = &qfilt_hash;
filt->eq = &qfilt_eq;
filt->to_s = &qfilt_to_s;
filt->destroy_i = &qfilt_destroy_i;
return filt;
}
Filter *qfilt_new(Query *query)
{
REF(query);
return qfilt_new_nr(query);
}
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