forked from blevesearch/bleve
/
stored.go
164 lines (139 loc) · 4.09 KB
/
stored.go
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// Copyright (c) 2015 Couchbase, Inc.
// Licensed 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 firestorm
import (
"bytes"
"encoding/binary"
"fmt"
)
var StoredKeyPrefix = []byte{'s'}
type StoredRow struct {
docID []byte
docNum uint64
field uint16
arrayPositions []uint64
value StoredValue
}
func NewStoredRow(docID []byte, docNum uint64, field uint16, arrayPositions []uint64, value []byte) *StoredRow {
rv := StoredRow{
docID: docID,
docNum: docNum,
field: field,
arrayPositions: arrayPositions,
}
if len(arrayPositions) < 1 {
rv.arrayPositions = make([]uint64, 0)
}
rv.value.Raw = value // FIXME review do we need to copy?
return &rv
}
func NewStoredRowKV(key, value []byte) (*StoredRow, error) {
rv := StoredRow{}
err := rv.ParseKey(key)
if err != nil {
return nil, err
}
err = rv.value.Unmarshal(value)
if err != nil {
return nil, err
}
return &rv, nil
}
func (sr *StoredRow) ParseKey(key []byte) error {
buf := bytes.NewBuffer(key)
_, err := buf.ReadByte() // type
if err != nil {
return err
}
sr.docID, err = buf.ReadBytes(ByteSeparator)
if len(sr.docID) < 2 { // 1 for min doc id length, 1 for separator
err = fmt.Errorf("invalid doc length 0")
return err
}
sr.docID = sr.docID[:len(sr.docID)-1] // trim off separator byte
sr.docNum, err = binary.ReadUvarint(buf)
if err != nil {
return err
}
err = binary.Read(buf, binary.LittleEndian, &sr.field)
if err != nil {
return err
}
sr.arrayPositions = make([]uint64, 0)
nextArrayPos, err := binary.ReadUvarint(buf)
for err == nil {
sr.arrayPositions = append(sr.arrayPositions, nextArrayPos)
nextArrayPos, err = binary.ReadUvarint(buf)
}
return nil
}
func (sr *StoredRow) KeySize() int {
return 1 + len(sr.docID) + 1 + binary.MaxVarintLen64 + 2 + (binary.MaxVarintLen64 * len(sr.arrayPositions))
}
func (sr *StoredRow) KeyTo(buf []byte) (int, error) {
buf[0] = 's'
copy(buf[1:], sr.docID)
buf[1+len(sr.docID)] = ByteSeparator
bytesUsed := 1 + len(sr.docID) + 1
bytesUsed += binary.PutUvarint(buf[bytesUsed:], sr.docNum)
binary.LittleEndian.PutUint16(buf[bytesUsed:], sr.field)
bytesUsed += 2
for _, arrayPosition := range sr.arrayPositions {
varbytes := binary.PutUvarint(buf[bytesUsed:], arrayPosition)
bytesUsed += varbytes
}
return bytesUsed, nil
}
func (sr *StoredRow) Key() []byte {
buf := make([]byte, sr.KeySize())
n, _ := sr.KeyTo(buf)
return buf[:n]
}
func (sr *StoredRow) ValueSize() int {
return sr.value.Size()
}
func (sr *StoredRow) ValueTo(buf []byte) (int, error) {
return sr.value.MarshalTo(buf)
}
func (sr *StoredRow) Value() []byte {
buf := make([]byte, sr.ValueSize())
n, _ := sr.ValueTo(buf)
return buf[:n]
}
func (sr *StoredRow) DocID() []byte {
return sr.docID
}
func (sr *StoredRow) DocNum() uint64 {
return sr.docNum
}
func (sr *StoredRow) String() string {
return fmt.Sprintf("StoredRow - Field: %d\n", sr.field) +
fmt.Sprintf("DocID '%s' - % x\n", sr.docID, sr.docID) +
fmt.Sprintf("DocNum %d\n", sr.docNum) +
fmt.Sprintf("Array Positions:\n%v", sr.arrayPositions) +
fmt.Sprintf("Value: % x", sr.value.GetRaw())
}
func StoredIteratorStartDocID(docID []byte) []byte {
docLen := len(docID)
buf := make([]byte, 1+docLen+1)
buf[0] = 's'
copy(buf[1:], docID)
buf[1+docLen] = ByteSeparator
return buf
}
func StoredPrefixDocIDNum(docID []byte, docNum uint64) []byte {
docLen := len(docID)
buf := make([]byte, 1+docLen+1+binary.MaxVarintLen64)
buf[0] = 's'
copy(buf[1:], docID)
buf[1+docLen] = ByteSeparator
bytesUsed := 1 + docLen + 1
bytesUsed += binary.PutUvarint(buf[bytesUsed:], docNum)
return buf[0:bytesUsed]
}