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vsphere-influxdb-go/vendor/github.com/influxdata/influxdb/influxql/iterator_mapper.go

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2017-10-25 22:52:40 +02:00
package influxql
import "fmt"
type IteratorMap interface {
Value(tags Tags, buf []interface{}) interface{}
}
type FieldMap int
func (i FieldMap) Value(tags Tags, buf []interface{}) interface{} { return buf[i] }
type TagMap string
func (s TagMap) Value(tags Tags, buf []interface{}) interface{} { return tags.Value(string(s)) }
type NullMap struct{}
func (NullMap) Value(tags Tags, buf []interface{}) interface{} { return nil }
func NewIteratorMapper(itrs []Iterator, driver IteratorMap, fields []IteratorMap, opt IteratorOptions) Iterator {
if driver != nil {
switch driver := driver.(type) {
case FieldMap:
switch itrs[int(driver)].(type) {
case FloatIterator:
return newFloatIteratorMapper(itrs, driver, fields, opt)
case IntegerIterator:
return newIntegerIteratorMapper(itrs, driver, fields, opt)
case StringIterator:
return newStringIteratorMapper(itrs, driver, fields, opt)
case BooleanIterator:
return newBooleanIteratorMapper(itrs, driver, fields, opt)
default:
panic(fmt.Sprintf("unable to map iterator type: %T", itrs[int(driver)]))
}
case TagMap:
return newStringIteratorMapper(itrs, driver, fields, opt)
default:
panic(fmt.Sprintf("unable to create iterator mapper with driveression type: %T", driver))
}
}
return newFloatIteratorMapper(itrs, nil, fields, opt)
}