func (db *TrailDB) NewEventFilter(query [][]FilterTerm) *EventFilter {
filter := EventFilter{filter: C.tdb_event_filter_new()}
for i, clause := range query {
if i > 0 {
err := C.tdb_event_filter_new_clause(filter.filter)
if err != 0 {
return nil
}
}
for _, term := range clause {
item := C.tdb_item(0)
field_id, err := db.GetField(term.Field)
if err == nil {
cs := C.CString(term.Value)
defer C.free(unsafe.Pointer(cs))
item = C.tdb_get_item(db.db,
C.tdb_field(field_id),
cs,
C.uint64_t(len(term.Value)))
}
isNegative := C.int(0)
if term.IsNegative {
isNegative = 1
}
ret := C.tdb_event_filter_add_term(filter.filter, item, isNegative)
if ret != 0 {
return nil
}
}
}
return &filter
}
func (db *TrailDB) FindTrails(filters map[string]string) ([]*Trail, error) {
var items []C.tdb_item
for k, v := range filters {
cs := C.CString(v)
defer C.free(unsafe.Pointer(cs))
item := C.tdb_get_item(db.db, C.tdb_field(db.fieldNameToId[k]), cs, C.uint64_t(len(v)))
items = append(items, item)
}
var result []*Trail
for i := uint64(0); i < db.NumTrails; i++ {
trail, err := NewTrail(db, i)
if err != nil {
return nil, err
}
for {
evt := trail.NextEvent()
if evt == nil {
trail.Close()
break
}
if evt.contains(items) {
returnTrail, err := NewTrail(db, i)
if err != nil {
return nil, err
}
result = append(result, returnTrail)
trail.Close()
break
}
}
}
return result, nil
}