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filtering_engine.go
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/
filtering_engine.go
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package engine
import (
"fmt"
"github.com/influxdb/influxdb/parser"
p "github.com/influxdb/influxdb/protocol"
)
type FilteringEngine struct {
query *parser.SelectQuery
processor Processor
shouldFilter bool
}
func NewFilteringEngine(query *parser.SelectQuery, processor Processor) *FilteringEngine {
shouldFilter := query.GetWhereCondition() != nil
return &FilteringEngine{query, processor, shouldFilter}
}
func (self *FilteringEngine) Yield(seriesIncoming *p.Series) (bool, error) {
if !self.shouldFilter {
return self.processor.Yield(seriesIncoming)
}
series, err := Filter(self.query, seriesIncoming)
if err != nil {
return false, fmt.Errorf("Error while filtering points: %s [query = %s]", err, self.query.GetQueryString())
}
if len(series.Points) == 0 {
return true, nil
}
return self.processor.Yield(series)
}
func (self *FilteringEngine) Close() error {
return self.processor.Close()
}
func (self *FilteringEngine) Name() string {
return self.processor.Name()
}
func (self *FilteringEngine) Next() Processor {
return self.processor.Next()
}