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binary_iterator.go
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/
binary_iterator.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package series
import (
"fmt"
"math"
"github.com/lindb/lindb/pkg/encoding"
"github.com/lindb/lindb/pkg/stream"
"github.com/lindb/lindb/series/field"
)
// binaryGroupedIterator implements GroupedIterator interface.
type binaryGroupedIterator struct {
tags string
fields map[field.Name][]byte
fieldNames []field.Name
it *BinaryIterator
idx int
}
func NewGroupedIterator(tags string, fields map[field.Name][]byte) GroupedIterator {
it := &binaryGroupedIterator{tags: tags, fields: fields}
for fieldName := range fields {
it.fieldNames = append(it.fieldNames, fieldName)
}
return it
}
func (g *binaryGroupedIterator) Tags() string {
return g.tags
}
func (g *binaryGroupedIterator) HasNext() bool {
if g.idx >= len(g.fieldNames) {
return false
}
g.idx++
return true
}
func (g *binaryGroupedIterator) Next() Iterator {
fieldName := g.fieldNames[g.idx-1]
if g.it == nil {
g.it = NewIterator(fieldName, g.fields[fieldName])
} else {
g.it.Reset(fieldName, g.fields[fieldName])
}
return g.it
}
// BinaryIterator implements Iterator interface.
type BinaryIterator struct {
fieldName field.Name
fieldType field.Type
reader *stream.Reader
fieldIt *BinaryFieldIterator
data []byte
}
func NewIterator(fieldName field.Name, data []byte) *BinaryIterator {
it := &BinaryIterator{fieldName: fieldName, reader: stream.NewReader(data), data: data}
it.fieldType = field.Type(it.reader.ReadByte())
return it
}
func (b *BinaryIterator) Reset(fieldName field.Name, data []byte) {
b.fieldName = fieldName
b.reader.Reset(data)
b.fieldType = field.Type(b.reader.ReadByte())
}
func (b *BinaryIterator) FieldName() field.Name {
return b.fieldName
}
func (b *BinaryIterator) FieldType() field.Type {
return b.fieldType
}
func (b *BinaryIterator) HasNext() bool {
return !b.reader.Empty()
}
func (b *BinaryIterator) Next() (startTime int64, fieldIt FieldIterator) {
startTime = b.reader.ReadVarint64()
length := b.reader.ReadVarint32()
if length == 0 {
return
}
data := b.reader.ReadBytes(int(length))
if b.fieldIt == nil {
b.fieldIt = NewFieldIterator(data)
} else {
b.fieldIt.reset(data)
}
fieldIt = b.fieldIt
return
}
func (b *BinaryIterator) MarshalBinary() ([]byte, error) {
return b.data, nil
}
// BinaryFieldIterator implements FieldIterator interface.
type BinaryFieldIterator struct {
reader *stream.Reader
pIt *BinaryPrimitiveIterator
}
// NewFieldIterator create field iterator based on binary data
func NewFieldIterator(data []byte) *BinaryFieldIterator {
it := &BinaryFieldIterator{
reader: stream.NewReader(data),
}
return it
}
func (it *BinaryFieldIterator) reset(data []byte) {
it.reader.Reset(data)
}
func (it *BinaryFieldIterator) HasNext() bool { return !it.reader.Empty() }
func (it *BinaryFieldIterator) Next() PrimitiveIterator {
aggType := field.AggType(it.reader.ReadByte())
length := it.reader.ReadVarint32()
data := it.reader.ReadBytes(int(length))
if it.pIt == nil {
it.pIt = NewPrimitiveIterator(aggType, encoding.NewTSDDecoder(data)) // TODO get from pool?
} else {
it.pIt.Reset(aggType, data)
}
return it.pIt
}
func (it *BinaryFieldIterator) MarshalBinary() ([]byte, error) {
return nil, fmt.Errorf("not support")
}
// BinaryPrimitiveIterator implements PrimitiveIterator interface.
type BinaryPrimitiveIterator struct {
aggType field.AggType
tsd *encoding.TSDDecoder
}
func NewPrimitiveIterator(aggType field.AggType, tsd *encoding.TSDDecoder) *BinaryPrimitiveIterator {
return &BinaryPrimitiveIterator{
aggType: aggType,
tsd: tsd,
}
}
func (pi *BinaryPrimitiveIterator) Reset(aggType field.AggType, data []byte) {
pi.aggType = aggType
pi.tsd.Reset(data)
}
func (pi *BinaryPrimitiveIterator) AggType() field.AggType {
return pi.aggType
}
func (pi *BinaryPrimitiveIterator) HasNext() bool {
if pi.tsd.Error() != nil {
return false
}
for pi.tsd.Next() {
if pi.tsd.HasValue() {
return true
}
}
return false
}
func (pi *BinaryPrimitiveIterator) Next() (timeSlot int, value float64) {
timeSlot = int(pi.tsd.Slot())
val := pi.tsd.Value()
value = math.Float64frombits(val)
return
}