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filtering_engine.go
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/
filtering_engine.go
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package engine
import (
log "code.google.com/p/log4go"
"github.com/influxdb/influxdb/parser"
p "github.com/influxdb/influxdb/protocol"
)
type FilteringEngine struct {
query *parser.SelectQuery
processor QueryProcessor
shouldFilter bool
}
func NewFilteringEngine(query *parser.SelectQuery, processor QueryProcessor) *FilteringEngine {
shouldFilter := query.GetWhereCondition() != nil
return &FilteringEngine{query, processor, shouldFilter}
}
// optimize for yield series and use it here
func (self *FilteringEngine) YieldPoint(seriesName *string, columnNames []string, point *p.Point) bool {
return self.YieldSeries(&p.Series{
Name: seriesName,
Fields: columnNames,
Points: []*p.Point{point},
})
}
func (self *FilteringEngine) YieldSeries(seriesIncoming *p.Series) bool {
if !self.shouldFilter {
return self.processor.YieldSeries(seriesIncoming)
}
series, err := Filter(self.query, seriesIncoming)
if err != nil {
log.Error("Error while filtering points: %s [query = %s]", err, self.query.GetQueryString())
return false
}
if len(series.Points) == 0 {
return true
}
return self.processor.YieldSeries(series)
}
func (self *FilteringEngine) Close() {
self.processor.Close()
}
func (self *FilteringEngine) SetShardInfo(shardId int, shardLocal bool) {
self.processor.SetShardInfo(shardId, shardLocal)
}
func (self *FilteringEngine) GetName() string {
return self.processor.GetName()
}