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unique_fields_iterator.go
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/
unique_fields_iterator.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package mem
import (
"bytes"
"sort"
sgmt "github.com/m3db/m3/src/m3ninx/index/segment"
"github.com/m3db/m3/src/m3ninx/postings"
)
type uniqueField struct {
field []byte
postingsList postings.List
}
type uniqueFieldsIter struct {
err error
done bool
currentIdx int
current uniqueField
backingSlice []uniqueField
opts Options
}
var _ sgmt.FieldsPostingsListIterator = &uniqueFieldsIter{}
func newUniqueFieldsIter(slice []uniqueField, opts Options) *uniqueFieldsIter {
sortSliceOfUniqueFields(slice)
return &uniqueFieldsIter{
currentIdx: -1,
backingSlice: slice,
opts: opts,
}
}
func (b *uniqueFieldsIter) Next() bool {
if b.done || b.err != nil {
return false
}
b.currentIdx++
if b.currentIdx >= len(b.backingSlice) {
b.done = true
return false
}
b.current = b.backingSlice[b.currentIdx]
return true
}
func (b *uniqueFieldsIter) Current() ([]byte, postings.List) {
return b.current.field, b.current.postingsList
}
func (b *uniqueFieldsIter) Err() error {
return nil
}
func (b *uniqueFieldsIter) Len() int {
return len(b.backingSlice)
}
func (b *uniqueFieldsIter) Close() error {
b.current = uniqueField{}
return nil
}
func sortSliceOfUniqueFields(b []uniqueField) {
sort.Slice(b, func(i, j int) bool {
return bytes.Compare(b[i].field, b[j].field) < 0
})
}