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|
package dstream
import (
"time"
"fmt"
)
func (fc *filterCol) Next() bool {
if !fc.source.Next() {
fc.nobsKnown = true
return false
}
n := ilen(fc.source.GetPos(0))
if n == 0 {
return true
}
fc.keep = resizeBool(fc.keep, n)
for i := range fc.keep {
fc.keep[i] = true
}
vm := VarMap(fc.source)
fc.filter(vm, fc.keep)
fc.keeppos = fc.keeppos[0:0]
for j := range fc.keep {
if fc.keep[j] {
fc.keeppos = append(fc.keeppos, j)
}
}
fc.nobs += len(fc.keeppos)
q := len(fc.keeppos)
for k, na := range fc.source.Names() {
v := fc.source.Get(na)
switch x := v.(type) {
{{- range . }}
case []{{ .Type }}:
var u []{{ .Type }}
if fc.bdata[k] != nil {
u = fc.bdata[k].([]{{ .Type}})
}
u = resize{{ .Utype }}(u, q)
u = u[0:q]
for i, j := range fc.keeppos {
u[i] = x[j]
}
fc.bdata[k] = u
{{- end }}
default:
msg := fmt.Sprintf("Unkown data type '%T'\n", v)
panic(msg)
}
}
return true
}
|
