129 lines
2.8 KiB
Go
129 lines
2.8 KiB
Go
// Copyright (c) 2015 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package firestorm
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import (
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"bytes"
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"encoding/binary"
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"io"
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"github.com/golang/protobuf/proto"
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)
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const ByteSeparator byte = 0xff
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var DictionaryKeyPrefix = []byte{'d'}
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type DictionaryRow struct {
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field uint16
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term []byte
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value DictionaryValue
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}
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func NewDictionaryRow(field uint16, term []byte, count uint64) *DictionaryRow {
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rv := DictionaryRow{
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field: field,
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term: term,
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}
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rv.value.Count = proto.Uint64(count)
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return &rv
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}
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func NewDictionaryRowK(key []byte) (*DictionaryRow, error) {
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rv := DictionaryRow{}
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buf := bytes.NewBuffer(key)
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_, err := buf.ReadByte() // type
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if err != nil {
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return nil, err
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}
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err = binary.Read(buf, binary.LittleEndian, &rv.field)
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if err != nil {
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return nil, err
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}
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rv.term, err = buf.ReadBytes(ByteSeparator)
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// there is no separator expected here, should get EOF
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if err != io.EOF {
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return nil, err
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}
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return &rv, nil
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}
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func (dr *DictionaryRow) parseDictionaryV(value []byte) error {
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err := dr.value.Unmarshal(value)
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if err != nil {
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return err
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}
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return nil
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}
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func NewDictionaryRowKV(key, value []byte) (*DictionaryRow, error) {
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rv, err := NewDictionaryRowK(key)
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if err != nil {
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return nil, err
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}
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err = rv.parseDictionaryV(value)
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if err != nil {
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return nil, err
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}
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return rv, nil
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}
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func (dr *DictionaryRow) Count() uint64 {
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return dr.value.GetCount()
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}
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func (dr *DictionaryRow) SetCount(count uint64) {
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dr.value.Count = proto.Uint64(count)
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}
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func (dr *DictionaryRow) KeySize() int {
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return 3 + len(dr.term)
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}
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func (dr *DictionaryRow) KeyTo(buf []byte) (int, error) {
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copy(buf[0:], DictionaryKeyPrefix)
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binary.LittleEndian.PutUint16(buf[1:3], dr.field)
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copy(buf[3:], dr.term)
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return 3 + len(dr.term), nil
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}
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func (dr *DictionaryRow) Key() []byte {
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buf := make([]byte, dr.KeySize())
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n, _ := dr.KeyTo(buf)
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return buf[:n]
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}
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func (dr *DictionaryRow) ValueSize() int {
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return dr.value.Size()
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}
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func (dr *DictionaryRow) ValueTo(buf []byte) (int, error) {
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return dr.value.MarshalTo(buf)
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}
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func (dr *DictionaryRow) Value() []byte {
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buf := make([]byte, dr.ValueSize())
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n, _ := dr.ValueTo(buf)
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return buf[:n]
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}
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func DictionaryRowKey(field uint16, term []byte) []byte {
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buf := make([]byte, 3+len(term))
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copy(buf[0:], DictionaryKeyPrefix)
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binary.LittleEndian.PutUint16(buf[1:3], field)
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copy(buf[3:], term)
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return buf
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}
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