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bytes_slice_iter.go
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/
bytes_slice_iter.go
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// Copyright (c) 2018 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 builder
import (
"bytes"
"sort"
"github.com/m3db/m3/src/m3ninx/index/segment"
)
// OrderedBytesSliceIter is a new ordered bytes slice iterator.
type OrderedBytesSliceIter struct {
err error
done bool
currentIdx int
current []byte
backingSlice [][]byte
}
var _ segment.FieldsIterator = &OrderedBytesSliceIter{}
// NewOrderedBytesSliceIter sorts a slice of bytes and then
// returns an iterator over them.
func NewOrderedBytesSliceIter(
maybeUnorderedSlice [][]byte,
) *OrderedBytesSliceIter {
sortSliceOfByteSlices(maybeUnorderedSlice)
return &OrderedBytesSliceIter{
currentIdx: -1,
backingSlice: maybeUnorderedSlice,
}
}
// Next returns true if there is a next result.
func (b *OrderedBytesSliceIter) 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
}
// Current returns the current entry.
func (b *OrderedBytesSliceIter) Current() []byte {
return b.current
}
// Err returns an error if an error occurred iterating.
func (b *OrderedBytesSliceIter) Err() error {
return nil
}
// Len returns the length of the slice.
func (b *OrderedBytesSliceIter) Len() int {
return len(b.backingSlice)
}
// Close releases resources.
func (b *OrderedBytesSliceIter) Close() error {
b.current = nil
return nil
}
func sortSliceOfByteSlices(b [][]byte) {
sort.Slice(b, func(i, j int) bool {
return bytes.Compare(b[i], b[j]) < 0
})
}